diff --git a/2025.05.02/02Ex/io_status.h b/2025.05.02/02Ex/io_status.h
deleted file mode 100644
index 8867bee..0000000
--- a/2025.05.02/02Ex/io_status.h
+++ /dev/null
@@ -1,16 +0,0 @@
-#ifndef IO_STATUS_H
-#define IO_STATUS_H
-
-#define ERR_MEM	"Error: Not enough memory!"
-#define ERR_OPEN "Error: Cannot open file"
-#define ERR_READ "Error: Cannot read file"
-#define ERR_FUNC "Error: Algorithm is not applicable!"
-
-typedef enum _io_status
-{
-	SUCCESS,
-	ERROR_OPEN,
-	ERROR_READ
-} io_status;
-
-#endif
diff --git a/2025.05.02/02Ex/main.c b/2025.05.02/02Ex/main.c
index abb10e8..0c0d7c0 100644
--- a/2025.05.02/02Ex/main.c
+++ b/2025.05.02/02Ex/main.c
@@ -12,8 +12,8 @@ int main(int argc, char *argv[])
 	int m, k, cl, it, task = 2;
 	
 	double (*f) (double);
-	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6, sin}; // TODO: Remove sin
-	double (*d_lst[]) (double) = {d0, d1, d2, d3, d4, d5, d6, cos}; // TODO: Remove cos
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	double (*d_lst[]) (double) = {d0, d1, d2, d3, d4, d5, d6};
 	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
 
 
@@ -36,13 +36,13 @@ int main(int argc, char *argv[])
 		
 	cl = get_call_function_count();
 
-	if (it > m)
+	if (it < 0)
 	{
 		fprintf(stdout, "%s : Task = %d NOT FOUND Count = %d T = %.2f\n", argv[0], task, cl, t);
 		return -2;
 	} else
 	{
-		printf("%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
+		fprintf(stdout, "%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
 		return 0;
 	}
 }
diff --git a/2025.05.02/02Ex/solve.c b/2025.05.02/02Ex/solve.c
index d53ea28..b288e9c 100644
--- a/2025.05.02/02Ex/solve.c
+++ b/2025.05.02/02Ex/solve.c
@@ -21,12 +21,15 @@ int t2_solve (
 		
 		if (fabs(dy) < DBL_EPSILON)
 		{
-			it = m+1;
+			it = -1;
 			break;
 		}
 
 		x_0 -= (y / dy);
 	}
+
+	if (it > m)
+		it = -1;
 	
 	*x = x_0;
 	return it;
diff --git a/2025.05.02/06Ex/Makefile b/2025.05.02/06Ex/Makefile
new file mode 100644
index 0000000..c209389
--- /dev/null
+++ b/2025.05.02/06Ex/Makefile
@@ -0,0 +1,42 @@
+WFLAGS = -fstack-protector-all -W -Wall -Wextra -Wunused \
+-Wempty-body -Wlogical-op -Wold-style-declaration -Wmissing-parameter-type \
+-Wignored-qualifiers -Winit-self -Wshadow -Wtype-limits \
+-Wpointer-arith -Wformat-security -Wmissing-format-attribute -Wformat=1 \
+-Wdeclaration-after-statement -Wbad-function-cast -Wnested-externs \
+-Wmissing-prototypes -Wmissing-declarations -Wold-style-definition \
+-Wcast-align -Werror -pedantic -pedantic-errors -Wfloat-equal \
+-Wwrite-strings -Wno-long-long -std=gnu99 -Wstrict-prototypes \
+-Wmissing-field-initializers -Wpointer-sign
+
+LDFLAGS = -std=gnu99 -mfpmath=sse -O3
+LDLIBS = -lm
+
+ifeq ($(OS),Windows_NT)
+	EXE = exe
+	CLEAN = del
+	LDLIBS += -lssp
+else
+	EXE = out
+	CLEAN = rm -f
+endif
+
+TARGET = a06.$(EXE)
+OBJ = main.o solve.o init_f.o
+
+%.o: %.c
+	gcc $(WFLAGS) $(LDFLAGS) -c $< -o $@
+
+$(TARGET): $(OBJ)
+	gcc $^ -o $@ $(LDLIBS)
+
+# Отладочная сборка (gdb)
+gdb: LDFLAGS = -std=gnu99 -mfpmath=sse -g -O0
+gdb: clean $(TARGET)
+
+# Профилировочная сборка (gprof)
+prof: LDFLAGS += -pg
+prof: LDLIBS += -pg
+prof: clean $(TARGET)
+
+clean:
+	$(CLEAN) *.o *$(EXE)
diff --git a/2025.05.02/06Ex/init_f.c b/2025.05.02/06Ex/init_f.c
new file mode 100644
index 0000000..22eb5ea
--- /dev/null
+++ b/2025.05.02/06Ex/init_f.c
@@ -0,0 +1,61 @@
+#include "init_f.h"
+
+#include <math.h>
+
+
+static int cl = 0;
+
+int get_call_count (void) 
+{
+	return cl;
+}
+
+double f0 (double x)
+{
+	cl++;
+	(void)x;
+
+	return 1;
+}
+
+double f1 (double x)
+{
+	cl++;
+	return (x * 1e-100) - 1.0;
+}
+
+double f2 (double x)
+{
+	cl++;
+	return 4 - x * x;
+}
+
+double f3 (double x)
+{
+	double x_2 = x * x;
+	cl++;
+
+	return x * x_2 + 3 * x_2 + 16;
+}
+
+double f4 (double x)
+{
+	double x_2 = x * x;
+	cl++;
+
+	return 3 - 2 * x_2 - x_2 * x_2;
+}
+
+double f5 (double x)
+{
+	cl++;
+	return sqrt(fabs(x) + 1) - 2;
+}
+
+double f6 (double x)
+{
+	cl++;
+	return sqrt(sqrt(fabs(x) + 1) + 1) - 2;
+}
+
+
diff --git a/2025.05.02/06Ex/init_f.h b/2025.05.02/06Ex/init_f.h
new file mode 100644
index 0000000..ee5e8e8
--- /dev/null
+++ b/2025.05.02/06Ex/init_f.h
@@ -0,0 +1,13 @@
+#ifndef INIT_F_H
+#define INIT_F_H
+
+int get_call_count (void); 
+double f0 (double x);
+double f1 (double x);
+double f2 (double x);
+double f3 (double x);
+double f4 (double x);
+double f5 (double x);
+double f6 (double x);
+
+#endif
diff --git a/2025.05.02/06Ex/main.c b/2025.05.02/06Ex/main.c
new file mode 100644
index 0000000..442f122
--- /dev/null
+++ b/2025.05.02/06Ex/main.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a.out a b eps M k */
+int main(int argc, char *argv[])
+{
+	double t, a, b, eps, x = 0;
+	int m, k, cl, it, task = 1;
+	
+	double (*f) (double);
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 6) && 
+			sscanf(argv[1], "%lf", &a) == 1 &&
+			sscanf(argv[2], "%lf", &b) == 1 &&
+			(a <= b) &&
+			(sscanf(argv[3], "%lf", &eps) == 1 && (eps >= 0)) &&
+			((sscanf(argv[4], "%d", &m) == 1) && m > 0) &&
+			((sscanf(argv[5], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s a b eps M k\n", argv[0]);
+		return -1;
+	}
+
+	f = f_lst[k];
+
+	t = clock();
+	it = t1_solve(f, a, b, eps, m, &x);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+		
+	cl = get_call_count();
+	
+	if (it < 0)
+	{
+		fprintf(stdout, "%s : Task = %d NOT FOUND Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else 
+	{
+		printf("%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.02/06Ex/solve.c b/2025.05.02/06Ex/solve.c
new file mode 100644
index 0000000..233ee33
--- /dev/null
+++ b/2025.05.02/06Ex/solve.c
@@ -0,0 +1,103 @@
+#include "solve.h"
+
+#include <math.h>
+#include <float.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+
+int t1_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+) {
+	int it = 0;
+	uint64_t bits;
+	double c = DBL_MAX, y, y_a = f(a), y_b = f(b);
+	bool sgn_a, sgn_b, sgn_c;
+
+	memcpy(&bits, &y_a, sizeof(bits));
+	sgn_a = (bits >> 63) & 1;
+	memcpy(&bits, &y_b, sizeof(bits));
+	sgn_b = (bits >> 63) & 1;
+
+	if (fabs(y_a) - eps < DBL_EPSILON)
+	{
+		*x = a;
+		return 1;
+	} if (fabs(y_b) - eps < DBL_EPSILON)
+	{
+		*x = b;
+		return 1;
+	}
+
+	if (sgn_a == sgn_b)
+	{
+		*x = DBL_MAX;
+		return -1;
+	}
+	
+	for (it = 1; it <= m; ++it)
+	{
+		c = (a + b) * 0.5;
+		y = f(c);
+		
+		memcpy(&bits, &y, sizeof(bits));
+		sgn_c = (bits >> 63) & 1;
+		
+		if (fabs(y) - eps < DBL_EPSILON)
+			break;
+		else if ((fabs(c - a) < DBL_EPSILON) || (fabs(c - b) < DBL_EPSILON))
+			it = m+1;
+		else if (sgn_c == sgn_a)
+		{
+			a = c;
+			y_a = y;
+		} else if (sgn_c == sgn_b)
+		{
+			b = c;
+			y_b = y;
+		}
+	}
+	
+	if (it > m)
+		it = -1;
+	
+	*x = c;
+
+	return it;
+}
+
+
+
+int t6_solve (
+		double (*f) (double), 
+		const int m, double *d
+		double a, double b, 
+		const double eps, const int M, double *x
+) {
+	const int len = m + 1;
+
+	double *y_lst = d;
+	double *x_lst = d + len;
+	double *t_lst = d + (len << 1);
+	
+	double last_x = a;
+	double last_y = f(a);
+	const int h = (b - a) / m;
+	
+	y_lst[0] = last_y;
+	x_lst[0] = last_x;
+	t_lst[0] = last_x;
+
+	for  (int i = 1, double t_x = a ; i < len ; i++, t_x += h)
+	{
+		double t_y = f(t_x);
+
+		y_lst[i] = t_y;
+		x_lst[i] = t_x;
+
+		
+	}
+
+}
diff --git a/2025.05.02/06Ex/solve.h b/2025.05.02/06Ex/solve.h
new file mode 100644
index 0000000..9b10deb
--- /dev/null
+++ b/2025.05.02/06Ex/solve.h
@@ -0,0 +1,10 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+int t1_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+		);
+
+#endif
diff --git a/2025.05.02/08Ex/solve.c b/2025.05.02/08Ex/solve.c
index aab65a9..de3a921 100644
--- a/2025.05.02/08Ex/solve.c
+++ b/2025.05.02/08Ex/solve.c
@@ -2,8 +2,6 @@
 
 #include <math.h>
 #include <float.h>
-#include <stdbool.h>
-
 
 int t8_solve (
 		double (*f) (double), 
diff --git a/2025.05.02/09Ex/main.c b/2025.05.02/09Ex/main.c
index b7efc26..71b6fa4 100644
--- a/2025.05.02/09Ex/main.c
+++ b/2025.05.02/09Ex/main.c
@@ -3,18 +3,16 @@
 #include <math.h>
 
 #include "init_f.h"
-#include "status.h"
 #include "solve.h"
 
 /* ./a.out a b eps M k */
 int main(int argc, char *argv[])
 {
 	double t, a, b, eps, x = 0;
-	int m, k, cl, it = 0, task = 1;
-	status ret;
+	int m, k, it, cl, task = 9;
 	
 	double (*f) (double);
-	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6, sin}; // TODO: Remove sin
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
 	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
 
 	if (
@@ -22,45 +20,30 @@ int main(int argc, char *argv[])
 			sscanf(argv[1], "%lf", &a) == 1 &&
 			sscanf(argv[2], "%lf", &b) == 1 &&
 			(a <= b) &&
-			sscanf(argv[3], "%lf", &eps) == 1 &&
+			(sscanf(argv[3], "%lf", &eps) == 1 && (eps >= 0)) &&
 			((sscanf(argv[4], "%d", &m) == 1) && m > 0) &&
 			((sscanf(argv[5], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
 	) {
 		fprintf(stderr, "Usage: %s a b eps M k\n", argv[0]);
-		return 1;
+		return -1;
 	}
 
 	f = f_lst[k];
 
 	t = clock();
-	ret = t1_solve(f, a, b, eps, m, &x, &it);
+	it = t9_solve(f, a, b, eps, m, &x);
 	t = (clock() - t) / CLOCKS_PER_SEC;
 		
 	cl = get_call_count();
 
-
-	do {
-		switch (ret) 
-		{
-			case SUCCESS:
-				continue;
-			case RUN_TIME:
-				fprintf(stderr, "Error: with code %d - Not enough iterations!\n", ret);
-				break;
-			case MORE_ONE_ROOT:
-				fprintf(stderr, "Error: with code %d - The same signs on the boundaries of the segment!\n", ret);
-				break;
-			case HIGH_ERROR:
-				fprintf(stderr, "Error: with code %d - The solution was found with a high error rate!\n", ret);
-				break;
-		}
-		
+	if (it < 0)
+	{
 		fprintf(stdout, "%s : Task = %d NOT FOUND Count = %d T = %.2f\n", argv[0], task, cl, t);
-		return ret;
-	} while (0);
-
-	printf("%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
-
-	return 0;
+		return -2;
+	} else 
+	{
+		fprintf(stdout, "%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
+		return 0;
+	}
 }
 
diff --git a/2025.05.02/09Ex/solve.c b/2025.05.02/09Ex/solve.c
index b521149..668b80c 100644
--- a/2025.05.02/09Ex/solve.c
+++ b/2025.05.02/09Ex/solve.c
@@ -1,68 +1,51 @@
 #include "solve.h"
-#include "status.h"
 
 #include <math.h>
 #include <float.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <string.h>
 
 int t9_solve (
 		double (*f) (double), 
 		double a, double b, 
 		double eps, int m, double *x
 ) {
+	const double gdrt = 2 / (1 + sqrt(5));
 	int it = 0;
-	double c = DBL_MAX, y, y_a = f(a), y_b = f(b);
 
-	if (fabs(y_a) - eps < DBL_EPSILON)
-	{
-		*x = a;
-		return SUCCESS;
-	} if (fabs(y_b) - eps < DBL_EPSILON)
-	{
-		*x = b;
-		return SUCCESS;
-	}
+	double x_1 = b + (a - b) * gdrt, x_2 = a + (b - a) * gdrt;
+	double y_1 = f(x_1), y_2 = f(x_2);
 
-	if (sgn_a == sgn_b)
+	for (it = 1; it <= m; ++it)
 	{
-		*x = DBL_MAX;
-		return MORE_ONE_ROOT;
-	}
-	
-	for (it = 0; it < m; ++it)
-	{
-		c = (a + b) * 0.5;
-		y = f(c);
-		
-		memcpy(&bits, &y, sizeof(bits));
-		sgn_c = (bits >> 63) & 1;
-		
-		if (fabs(y) - eps < DBL_EPSILON)
+		if (y_1 - y_2 > DBL_EPSILON)
 		{
-			ret = SUCCESS;
+			b = x_2;
+
+			x_2 = x_1;
+			y_2 = y_1;
+
+			x_1 = b + (a - b) * gdrt;
+			y_1 = f(x_1);
+		} else
+		{
+			a = x_1;
+
+			x_1 = x_2;
+			y_1 = y_2;
+
+			x_2 = a + (b - a) * gdrt;
+			y_2 = f(x_2);
+		}
+
+		if (fabs(b - a) < eps)
+		{
+			*x = x_1;
 			break;
-		} else if ((fabs(c - a) < DBL_EPSILON) || (fabs(c - b) < DBL_EPSILON))
-		{
-			ret = HIGH_ERROR;
-			break;
-		} else if (sgn_c == sgn_a)
-		{
-			a = c;
-			y_a = y;
-		} else if (sgn_c == sgn_b)
-		{
-			b = c;
-			y_b = y;
 		}
 	}
-	
-	if (it >= m)
-		ret = RUN_TIME;
-	
-	*x = c;
 
-	return ret;
+	if (it > m)
+		it = -1;
+
+	return it;
 }
 
diff --git a/2025.05.02/09Ex/solve.h b/2025.05.02/09Ex/solve.h
index d57ce24..1dce4d6 100644
--- a/2025.05.02/09Ex/solve.h
+++ b/2025.05.02/09Ex/solve.h
@@ -1,12 +1,10 @@
 #ifndef SOLVE_H
 #define SOLVE_H
 
-#include "status.h"
-
-status t1_solve (
+int t9_solve (
 		double (*f) (double), 
 		double a, double b, 
-		double eps, int m, double *x, int *m_it
+		double eps, int m, double *x
 		);
 
 #endif
diff --git a/2025.05.02/Krivoruchenko_SK.zip b/2025.05.02/Krivoruchenko_SK.zip
new file mode 100644
index 0000000..50c9a6d
Binary files /dev/null and b/2025.05.02/Krivoruchenko_SK.zip differ
diff --git a/2025.05.02/dist/Krivoruchenko_SK/Makefile b/2025.05.02/dist/Krivoruchenko_SK/Makefile
new file mode 100644
index 0000000..6b3cc40
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/Makefile
@@ -0,0 +1,14 @@
+FLAGS = -fstack-protector-all -W -Wall -Wextra -Wunused -Wcast-align -Werror -pedantic -pedantic-errors -Wfloat-equal -Wpointer-arith -Wformat-security -Wmissing-format-attribute -Wformat=1 -Wwrite-strings -Wcast-align -Wno-long-long -std=gnu99 -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wold-style-definition -Wdeclaration-after-statement -Wbad-function-cast -Wnested-externs -O3
+
+%.out: %.o solve.o init_f.o
+	 gcc $(FLAGS) $^ -o $@ -lm
+%.o: %.c
+	 gcc -c $(FLAGS) $<
+
+all: a01.out a02.out a03.out a04.out a07.out a08.out a09.out
+
+solve.o: solve.c solve.h
+init_f.o: init_f.c init_f.h
+
+clean:
+	 rm -f *.o *.out
diff --git a/2025.05.02/dist/Krivoruchenko_SK/a01.c b/2025.05.02/dist/Krivoruchenko_SK/a01.c
new file mode 100644
index 0000000..442f122
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/a01.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a.out a b eps M k */
+int main(int argc, char *argv[])
+{
+	double t, a, b, eps, x = 0;
+	int m, k, cl, it, task = 1;
+	
+	double (*f) (double);
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 6) && 
+			sscanf(argv[1], "%lf", &a) == 1 &&
+			sscanf(argv[2], "%lf", &b) == 1 &&
+			(a <= b) &&
+			(sscanf(argv[3], "%lf", &eps) == 1 && (eps >= 0)) &&
+			((sscanf(argv[4], "%d", &m) == 1) && m > 0) &&
+			((sscanf(argv[5], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s a b eps M k\n", argv[0]);
+		return -1;
+	}
+
+	f = f_lst[k];
+
+	t = clock();
+	it = t1_solve(f, a, b, eps, m, &x);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+		
+	cl = get_call_count();
+	
+	if (it < 0)
+	{
+		fprintf(stdout, "%s : Task = %d NOT FOUND Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else 
+	{
+		printf("%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.02/dist/Krivoruchenko_SK/a02.c b/2025.05.02/dist/Krivoruchenko_SK/a02.c
new file mode 100644
index 0000000..0c0d7c0
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/a02.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a.out x_0 eps M k */
+int main(int argc, char *argv[])
+{
+	double t, x_0, eps, x = 0;
+	int m, k, cl, it, task = 2;
+	
+	double (*f) (double);
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	double (*d_lst[]) (double) = {d0, d1, d2, d3, d4, d5, d6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+
+	if (
+			!((argc == 5) && 
+			sscanf(argv[1], "%lf", &x_0) == 1 &&
+			(sscanf(argv[2], "%lf", &eps) == 1 && (eps >= 0)) &&
+			((sscanf(argv[3], "%d", &m) == 1) && (m > 0)) &&
+			((sscanf(argv[4], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s x_0 eps M k\n", argv[0]);
+		return -1;
+	}
+
+	f = f_lst[k];
+
+	t = clock();
+	it = t2_solve(f, d_lst[k], x_0, eps, m, &x);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+		
+	cl = get_call_function_count();
+
+	if (it < 0)
+	{
+		fprintf(stdout, "%s : Task = %d NOT FOUND Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else
+	{
+		fprintf(stdout, "%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.02/dist/Krivoruchenko_SK/a03.c b/2025.05.02/dist/Krivoruchenko_SK/a03.c
new file mode 100644
index 0000000..0dc3eb4
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/a03.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a.out a b eps M k */
+int main(int argc, char *argv[])
+{
+	double t, a, b, eps, x = 0;
+	int m, k, cl, it, task = 3;
+	
+	double (*f) (double);
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 6) && 
+			sscanf(argv[1], "%lf", &a) == 1 &&
+			sscanf(argv[2], "%lf", &b) == 1 &&
+			(a <= b) &&
+			(sscanf(argv[3], "%lf", &eps) == 1 && (eps >= 0)) &&
+			((sscanf(argv[4], "%d", &m) == 1) && m > 0) &&
+			((sscanf(argv[5], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s a b eps M k\n", argv[0]);
+		return -1;
+	}
+
+	f = f_lst[k];
+
+	t = clock();
+	it = t3_solve(f, a, b, eps, m, &x);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+		
+	cl = get_call_count();
+
+	if (it < 0)
+	{
+		fprintf(stdout, "%s : Task = %d NOT FOUND Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else
+	{
+		fprintf(stdout, "%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.02/dist/Krivoruchenko_SK/a04.c b/2025.05.02/dist/Krivoruchenko_SK/a04.c
new file mode 100644
index 0000000..3403844
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/a04.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a.out a b eps M k */
+int main(int argc, char *argv[])
+{
+	double t, a, b, eps, x = 0;
+	int m, k, cl, it, task = 4;
+	
+	double (*f) (double);
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 6) && 
+			sscanf(argv[1], "%lf", &a) == 1 &&
+			sscanf(argv[2], "%lf", &b) == 1 &&
+			(a <= b) &&
+			(sscanf(argv[3], "%lf", &eps) == 1 && (eps >= 0)) &&
+			((sscanf(argv[4], "%d", &m) == 1) && m > 0) &&
+			((sscanf(argv[5], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s a b eps M k\n", argv[0]);
+		return -1;
+	}
+
+	f = f_lst[k];
+
+	t = clock();
+	it = t4_solve(f, a, b, eps, m, &x);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+		
+	cl = get_call_count();
+
+	if (it < 0)
+	{
+		fprintf(stdout, "%s : Task = %d NOT FOUND Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else
+	{
+		printf("%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.02/dist/Krivoruchenko_SK/a07.c b/2025.05.02/dist/Krivoruchenko_SK/a07.c
new file mode 100644
index 0000000..c426a06
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/a07.c
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a.out x_0 eps M k */
+int main(int argc, char *argv[])
+{
+	double t, x_0, eps, x = 0;
+	int m, k, cl, it, task = 7;
+	
+	double (*f) (double);
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 5) && 
+			sscanf(argv[1], "%lf", &x_0) == 1 &&
+			(sscanf(argv[2], "%lf", &eps) == 1 && (eps >= 0)) &&
+			((sscanf(argv[3], "%d", &m) == 1) && (m > 0)) &&
+			((sscanf(argv[4], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s x_0 eps M k\n", argv[0]);
+		return -1;
+	}
+
+	f = f_lst[k];
+
+	t = clock();
+	it = t7_solve(f, x_0, eps, m, &x);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+		
+	cl = get_call_count();
+
+	if (it < 0)
+	{
+		fprintf(stdout, "%s : Task = %d NOT FOUND Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else
+	{
+		printf("%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.02/dist/Krivoruchenko_SK/a08.c b/2025.05.02/dist/Krivoruchenko_SK/a08.c
new file mode 100644
index 0000000..4c307e6
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/a08.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a.out a b eps M k */
+int main(int argc, char *argv[])
+{
+	double t, a, b, eps, x = 0;
+	int m, k, it, cl, task = 8;
+	
+	double (*f) (double);
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 6) && 
+			sscanf(argv[1], "%lf", &a) == 1 &&
+			sscanf(argv[2], "%lf", &b) == 1 &&
+			(a <= b) &&
+			(sscanf(argv[3], "%lf", &eps) == 1 && (eps >= 0)) &&
+			((sscanf(argv[4], "%d", &m) == 1) && m > 0) &&
+			((sscanf(argv[5], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s a b eps M k\n", argv[0]);
+		return -1;
+	}
+
+	f = f_lst[k];
+
+	t = clock();
+	it = t8_solve(f, a, b, eps, m, &x);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+		
+	cl = get_call_count();
+
+	if (it < 0)
+	{
+		fprintf(stdout, "%s : Task = %d NOT FOUND Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else 
+	{
+		fprintf(stdout, "%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.02/dist/Krivoruchenko_SK/a09.c b/2025.05.02/dist/Krivoruchenko_SK/a09.c
new file mode 100644
index 0000000..71b6fa4
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/a09.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a.out a b eps M k */
+int main(int argc, char *argv[])
+{
+	double t, a, b, eps, x = 0;
+	int m, k, it, cl, task = 9;
+	
+	double (*f) (double);
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 6) && 
+			sscanf(argv[1], "%lf", &a) == 1 &&
+			sscanf(argv[2], "%lf", &b) == 1 &&
+			(a <= b) &&
+			(sscanf(argv[3], "%lf", &eps) == 1 && (eps >= 0)) &&
+			((sscanf(argv[4], "%d", &m) == 1) && m > 0) &&
+			((sscanf(argv[5], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s a b eps M k\n", argv[0]);
+		return -1;
+	}
+
+	f = f_lst[k];
+
+	t = clock();
+	it = t9_solve(f, a, b, eps, m, &x);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+		
+	cl = get_call_count();
+
+	if (it < 0)
+	{
+		fprintf(stdout, "%s : Task = %d NOT FOUND Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else 
+	{
+		fprintf(stdout, "%s : Task = %d X = %e Res = %e Its = %d Count = %d T = %.2f\n", argv[0], task, x, f(x), it, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.02/dist/Krivoruchenko_SK/init_f.c b/2025.05.02/dist/Krivoruchenko_SK/init_f.c
new file mode 100644
index 0000000..b14a5a9
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/init_f.c
@@ -0,0 +1,128 @@
+#include "init_f.h"
+
+#include <math.h>
+#include <float.h>
+
+
+static int cl_f = 0;
+static int cl_d = 0;
+
+int get_call_count (void) 
+{
+	return cl_f;
+}
+
+int get_call_function_count (void) 
+{
+	return cl_f;
+}
+
+int get_call_derivative_count (void)
+{
+	return cl_d;
+}
+
+double f0 (double x)
+{
+	cl_f++;
+	(void)x;
+
+	return 1;
+}
+
+double d0 (double x)
+{
+	cl_d++;
+	(void)x;
+
+	return 0;
+}
+
+double f1 (double x)
+{
+	cl_f++;
+	return ((x * 1e-100) - 1.0) * 1e100;
+}
+
+double d1 (double x)
+{
+	(void)x;
+	cl_d++;
+	return 1;
+}
+
+double f2 (double x)
+{
+	cl_f++;
+	return 4 - x * x;
+}
+
+double d2 (double x)
+{
+	cl_d++;
+	return -2 * x;
+}
+
+double f3 (double x)
+{
+	double x_2 = x * x;
+	cl_f++;
+
+	return x * x_2 + 3 * x_2 + 16;
+}
+
+double d3 (double x)
+{
+	cl_d++;
+
+	return 3 * x * x + 6 * x;
+}
+
+double f4 (double x)
+{
+	double x_2 = x * x;
+	cl_f++;
+
+	return 3 - 2 * x_2 - x_2 * x_2;
+}
+
+double d4 (double x)
+{
+	cl_d++;
+
+	return -4 * x - 4 * ((x * x) * x);
+}
+
+double f5 (double x)
+{
+	cl_f++;
+	return sqrt(fabs(x) + 1) - 2;
+}
+
+double d5 (double x)
+{
+	cl_d++;
+	if (x < -DBL_EPSILON)
+		return (-1.0 / (sqrt(fabs(x) + 1))) * 0.5;
+	else if (x > DBL_EPSILON)
+		return (1.0 / (sqrt(fabs(x) + 1))) * 0.5;
+	return 0;
+}
+
+double f6 (double x)
+{
+	cl_f++;
+	return sqrt(sqrt(fabs(x) + 1) + 1) - 2;
+}
+
+double d6 (double x)
+{
+	double sqrt_x = sqrt(fabs(x) + 1);
+	cl_d++;
+	
+	if (x < -DBL_EPSILON)
+		return (-1.0 / (sqrt(sqrt_x + 1) * sqrt_x)) * 0.25;
+	else if (x > DBL_EPSILON)
+		return (1.0 / (sqrt(sqrt_x + 1) * sqrt_x)) * 0.25;
+	return 0;
+}
diff --git a/2025.05.02/dist/Krivoruchenko_SK/init_f.h b/2025.05.02/dist/Krivoruchenko_SK/init_f.h
new file mode 100644
index 0000000..c927c42
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/init_f.h
@@ -0,0 +1,29 @@
+#ifndef INIT_F_H
+#define INIT_F_H
+
+int get_call_count (void);
+int get_call_function_count (void) ;
+int get_call_derivative_count (void);
+
+double f0 (double x);
+double d0 (double x);
+
+double f1 (double x);
+double d1 (double x);
+
+double f2 (double x);
+double d2 (double x);
+
+double f3 (double x);
+double d3 (double x);
+
+double f4 (double x);
+double d4 (double x);
+
+double f5 (double x);
+double d5 (double x);
+
+double f6 (double x);
+double d6 (double x);
+
+#endif
diff --git a/2025.05.02/dist/Krivoruchenko_SK/solve.c b/2025.05.02/dist/Krivoruchenko_SK/solve.c
new file mode 100644
index 0000000..0581e61
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/solve.c
@@ -0,0 +1,341 @@
+#include "solve.h"
+
+#include <math.h>
+#include <float.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+
+int t1_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+) {
+	int it = 0;
+	uint64_t bits;
+	double c = DBL_MAX, y, y_a = f(a), y_b = f(b);
+	bool sgn_a, sgn_b, sgn_c;
+
+	memcpy(&bits, &y_a, sizeof(bits));
+	sgn_a = (bits >> 63) & 1;
+	memcpy(&bits, &y_b, sizeof(bits));
+	sgn_b = (bits >> 63) & 1;
+
+	if (fabs(y_a) - eps < DBL_EPSILON)
+	{
+		*x = a;
+		return 1;
+	} if (fabs(y_b) - eps < DBL_EPSILON)
+	{
+		*x = b;
+		return 1;
+	}
+
+	if (sgn_a == sgn_b)
+	{
+		*x = DBL_MAX;
+		return -1;
+	}
+	
+	for (it = 1; it <= m; ++it)
+	{
+		c = (a + b) * 0.5;
+		y = f(c);
+		
+		memcpy(&bits, &y, sizeof(bits));
+		sgn_c = (bits >> 63) & 1;
+		
+		if (fabs(y) - eps < DBL_EPSILON)
+			break;
+		else if ((fabs(c - a) < DBL_EPSILON) || (fabs(c - b) < DBL_EPSILON))
+			it = m+1;
+		else if (sgn_c == sgn_a)
+		{
+			a = c;
+			y_a = y;
+		} else if (sgn_c == sgn_b)
+		{
+			b = c;
+			y_b = y;
+		}
+	}
+	
+	if (it > m)
+		it = -1;
+	
+	*x = c;
+
+	return it;
+}
+
+int t2_solve (
+		double (*f) (double), 
+		double (*d) (double), 
+		double x_0, double eps, 
+		int m, double *x
+) {
+	int it = 0;
+
+	for (it = 1; it <= m; ++it)
+	{	
+		double y = f(x_0);
+		double dy = d(x_0);
+
+		if (fabs(y) - eps < DBL_EPSILON)
+			break;
+		
+		if (fabs(dy) < DBL_EPSILON)
+		{
+			it = -1;
+			break;
+		}
+
+		x_0 -= (y / dy);
+	}
+
+	if (it > m)
+		it = -1;
+	
+	*x = x_0;
+	return it;
+}
+
+int t3_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+) {
+	int it = 0;
+	uint64_t bits;
+	double c = DBL_MAX, y, y_a = f(a), y_b = f(b);
+	bool sgn_a, sgn_b, sgn_c;
+
+	memcpy(&bits, &y_a, sizeof(bits));
+	sgn_a = (bits >> 63) & 1;
+	memcpy(&bits, &y_b, sizeof(bits));
+	sgn_b = (bits >> 63) & 1;
+
+	if (fabs(y_a) - eps < DBL_EPSILON)
+	{
+		*x = a;
+		return 1;
+	} if (fabs(y_b) - eps < DBL_EPSILON)
+	{
+		*x = b;
+		return 1;
+	}
+
+	if (sgn_a == sgn_b)
+	{
+		*x = DBL_MAX;
+		return -1;
+	}
+	
+	for (it = 1; it <= m; ++it)
+	{
+		c = a - ((a - b) / (y_a - y_b)) * y_a;
+		y = f(c);
+		
+		memcpy(&bits, &y, sizeof(bits));
+		sgn_c = (bits >> 63) & 1;
+		
+		if ((c - a < DBL_EPSILON) || (c - b > DBL_EPSILON))
+			it = m+1;
+		else if (fabs(y) - eps < DBL_EPSILON)
+			break;
+		else if (sgn_c == sgn_a)
+		{	
+			a = c;
+			y_a = y;
+		} else if (sgn_c == sgn_b)
+		{
+			b = c;
+			y_b = y;
+		}
+	}
+	
+	if (it > m)
+		it = -1;
+	
+	*x = c;
+
+	return it;
+}
+
+int t4_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+) {
+	int it = 0;
+	double c = DBL_MAX, y, y_a = f(a), y_b = f(b);
+
+	if (fabs(y_a) - eps < DBL_EPSILON)
+	{
+		*x = a;
+		return 1;
+	} if (fabs(y_b) - eps < DBL_EPSILON)
+	{
+		*x = b;
+		return 1;
+	} if (fabs(fabs(y_b) - fabs(y_a)) < DBL_EPSILON)
+	{
+		*x = a;
+		return -1;
+	}
+
+	for (it = 1; it <= m; ++it)
+	{
+		c = b - ((b - a) / (y_b - y_a)) * y_b;
+		y = f(c);
+		
+		if (fabs(y) - eps < DBL_EPSILON)
+			break;
+		else if (fabs(y_a) - fabs(y_b) > DBL_EPSILON)
+		{
+			a = c;
+			y_a = y;
+		} else if (fabs(y_b) - fabs(y_a) > DBL_EPSILON)
+		{
+			b = c;
+			y_b = y;
+		} else
+			it = m+1;
+	}
+	
+	if (it > m)
+		it = -1;
+	
+	*x = c;
+
+	return it;
+}
+
+int t7_solve (
+		double (*f) (double), 
+		double x_0, double eps, 
+		int m, double *x
+) {
+	int it = 0;
+	double y = f(x_0);
+
+	if (fabs(y - x_0) - eps < DBL_EPSILON)
+	{
+		*x = x_0;
+		return 1;
+	}
+
+	for (it = 1; it <= m; ++it)
+	{
+		x_0 = y;
+		y = f(x_0);
+		
+		if (fabs(y - x_0) - eps < DBL_EPSILON)
+			break;
+	}
+
+	if (it > m)
+		it = -1;
+	
+	*x = x_0;
+
+	return it;
+}
+
+int t8_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+) {
+	int it = 1;
+	double x_l = 0, y_l = 0, c = a, y = f(a);
+
+	if (fabs(b - a) < DBL_EPSILON)
+	{
+		*x = a;
+		return 1;
+	}
+
+	for (double h = (b - a) * 0.1; fabs(h) > DBL_EPSILON; h *= -0.1)
+	{
+		do {
+			if (it > m)
+				break;
+
+			it++;
+			x_l = c;
+			y_l = y;
+			
+			c += h;
+			y = f(c);
+		} while (((y - y_l) - eps) > DBL_EPSILON);
+		
+		if (it > m)
+		{
+			it = -1;
+			break;
+		}
+
+		if ((c - b) > DBL_EPSILON)
+		{
+			x_l = b;
+			y_l = f(b);
+			break;
+		} else if ((a - c) > DBL_EPSILON)
+		{
+			x_l = a;
+			y_l = f(b);
+			break;
+		}
+	}
+	
+	*x = x_l;
+
+	return it;
+}
+
+int t9_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+) {
+	const double gdrt = 2 / (1 + sqrt(5));
+	int it = 0;
+
+	double x_1 = b + (a - b) * gdrt, x_2 = a + (b - a) * gdrt;
+	double y_1 = f(x_1), y_2 = f(x_2);
+
+	for (it = 1; it <= m; ++it)
+	{
+		if (y_1 - y_2 > DBL_EPSILON)
+		{
+			b = x_2;
+
+			x_2 = x_1;
+			y_2 = y_1;
+
+			x_1 = b + (a - b) * gdrt;
+			y_1 = f(x_1);
+		} else
+		{
+			a = x_1;
+
+			x_1 = x_2;
+			y_1 = y_2;
+
+			x_2 = a + (b - a) * gdrt;
+			y_2 = f(x_2);
+		}
+
+		if (fabs(b - a) < eps)
+		{
+			*x = x_1;
+			break;
+		}
+	}
+
+	if (it > m)
+		it = -1;
+
+	return it;
+}
diff --git a/2025.05.02/dist/Krivoruchenko_SK/solve.h b/2025.05.02/dist/Krivoruchenko_SK/solve.h
new file mode 100644
index 0000000..7065241
--- /dev/null
+++ b/2025.05.02/dist/Krivoruchenko_SK/solve.h
@@ -0,0 +1,47 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+int t1_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+		);
+
+int t2_solve (
+		double (*f) (double), 
+		double (*d) (double), 
+		double x_0, double eps, 
+		int m, double *x
+		);
+
+int t3_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+		);
+		
+int t4_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+		);
+		
+int t7_solve (
+		double (*f) (double), 
+		double x_0, double eps, 
+		int m, double *x
+		);
+	
+int t8_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+		);
+
+int t9_solve (
+		double (*f) (double), 
+		double a, double b, 
+		double eps, int m, double *x
+		);
+
+#endif
diff --git a/2025.05.02/tests/2nd_must_find_test.sh b/2025.05.02/tests/2nd_must_find_test.sh
new file mode 100755
index 0000000..9ca2706
--- /dev/null
+++ b/2025.05.02/tests/2nd_must_find_test.sh
@@ -0,0 +1,18 @@
+script_name="$(basename "$0")"
+iter="1000"
+mkdir -p tests
+
+if [ "$#" -ne 2 ]; then
+	echo "The number of parameters is less than 2"
+	exit 1
+fi
+
+make
+
+for (( k = 3 ; k < 7; k++ )); do 
+	echo "------- K = $k -------"
+	for (( a = -100 ; a < 100 ; a++ )); do 
+		echo "k = $k x_0 = "$(echo "$a / 10" | bc -l)" Iter = $iter ---"
+		./a0$1.out "$(echo "$a / 10" | bc -l)" 1e-16 $iter $k
+	done
+done >$(pwd)/tests/out_$script_name.log 2>$(pwd)/tests/err_$script_name.log
diff --git a/2025.05.09/01Ex/Makefile b/2025.05.09/01Ex/Makefile
new file mode 100644
index 0000000..2eb337d
--- /dev/null
+++ b/2025.05.09/01Ex/Makefile
@@ -0,0 +1,42 @@
+WFLAGS = -fstack-protector-all -W -Wall -Wextra -Wunused \
+-Wempty-body -Wlogical-op -Wold-style-declaration -Wmissing-parameter-type \
+-Wignored-qualifiers -Winit-self -Wshadow -Wtype-limits \
+-Wpointer-arith -Wformat-security -Wmissing-format-attribute -Wformat=1 \
+-Wdeclaration-after-statement -Wbad-function-cast -Wnested-externs \
+-Wmissing-prototypes -Wmissing-declarations -Wold-style-definition \
+-Wcast-align -Werror -pedantic -pedantic-errors -Wfloat-equal \
+-Wwrite-strings -Wno-long-long -std=gnu99 -Wstrict-prototypes \
+-Wmissing-field-initializers -Wpointer-sign
+
+LDFLAGS = -std=gnu99 -mfpmath=sse -O3
+LDLIBS = -lm
+
+ifeq ($(OS),Windows_NT)
+	EXE = exe
+	CLEAN = del
+	LDLIBS += -lssp
+else
+	EXE = out
+	CLEAN = rm -f
+endif
+
+TARGET = a01.$(EXE)
+OBJ = main.o solve.o init_f.o
+
+%.o: %.c
+	gcc $(WFLAGS) $(LDFLAGS) -c $< -o $@
+
+$(TARGET): $(OBJ)
+	gcc $^ -o $@ $(LDLIBS)
+
+# Отладочная сборка (gdb)
+gdb: LDFLAGS = -std=gnu99 -mfpmath=sse -g -O0
+gdb: clean $(TARGET)
+
+# Профилировочная сборка (gprof)
+prof: LDFLAGS += -pg
+prof: LDLIBS += -pg
+prof: clean $(TARGET)
+
+clean:
+	$(CLEAN) *.o *$(EXE)
diff --git a/2025.05.09/01Ex/init_f.c b/2025.05.09/01Ex/init_f.c
new file mode 100644
index 0000000..584d534
--- /dev/null
+++ b/2025.05.09/01Ex/init_f.c
@@ -0,0 +1,61 @@
+#include "init_f.h"
+
+#include <math.h>
+
+
+static int cl = 0;
+
+int get_call_count (void) 
+{
+	return cl;
+}
+
+double f0 (double x)
+{
+	cl++;
+	(void)x;
+
+	return 1;
+}
+
+double f1 (double x)
+{
+	cl++;
+	return x + 1;
+}
+
+double f2 (double x)
+{
+	cl++;
+	return x * x + x + 1;
+}
+
+double f3 (double x)
+{
+	double x_2 = x * x;
+	cl++;
+
+	return x * x_2 + x_2 + x + 1;
+}
+
+double f4 (double x)
+{
+	double x_2 = x * x;
+	double x_3 = x_2 * x;
+	cl++;
+
+	return x * x_3 + x_3 + x_2 + x + 1;
+}
+
+double f5 (double x)
+{
+	cl++;
+	return exp(-x);
+}
+
+double f6 (double x)
+{
+	cl++;
+	return 1 / (25 * x * x + 1);
+}
+
diff --git a/2025.05.09/01Ex/init_f.h b/2025.05.09/01Ex/init_f.h
new file mode 100644
index 0000000..ee5e8e8
--- /dev/null
+++ b/2025.05.09/01Ex/init_f.h
@@ -0,0 +1,13 @@
+#ifndef INIT_F_H
+#define INIT_F_H
+
+int get_call_count (void); 
+double f0 (double x);
+double f1 (double x);
+double f2 (double x);
+double f3 (double x);
+double f4 (double x);
+double f5 (double x);
+double f6 (double x);
+
+#endif
diff --git a/2025.05.09/01Ex/main.c b/2025.05.09/01Ex/main.c
new file mode 100644
index 0000000..90920e6
--- /dev/null
+++ b/2025.05.09/01Ex/main.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+#include <float.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a01.out x h k */
+int main (int argc, char *argv[])
+{
+	double t, x, h, d;
+	int k, cl, task = 1;
+	
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 4) && 
+			sscanf(argv[1], "%lf", &x) == 1 &&
+			((sscanf(argv[2], "%lf", &h) == 1) && (h > 0)) &&
+			((sscanf(argv[3], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s x h k\n", argv[0]);
+		return -1;
+	}
+
+
+	t = clock();
+	d = t1_solve(f_lst[k], x, h);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+	
+	cl = get_call_count();
+
+	if (fabs(d - DBL_MAX) < DBL_EPSILON)
+	{
+		fprintf (stdout, "%s : Task = %d Method is not applicable Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else
+	{
+		fprintf (stdout, "%s : Task = %d Res = %e Count = %d T = %.2f\n", argv[0], task, d, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.09/01Ex/solve.c b/2025.05.09/01Ex/solve.c
new file mode 100644
index 0000000..c167e37
--- /dev/null
+++ b/2025.05.09/01Ex/solve.c
@@ -0,0 +1,14 @@
+#include "solve.h"
+
+#include <math.h>
+#include <float.h>
+
+int t1_solve (
+		double (*f) (double), 
+		double x, double h 
+) {
+	if (h < DBL_EPSILON)
+		return DBL_MAX;
+	return (f(x + h) - f(x)) / h;
+}
+
diff --git a/2025.05.09/01Ex/solve.h b/2025.05.09/01Ex/solve.h
new file mode 100644
index 0000000..3d511de
--- /dev/null
+++ b/2025.05.09/01Ex/solve.h
@@ -0,0 +1,9 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+int t1_solve (
+		double (*f) (double), 
+		double x, double h 
+);
+
+#endif
diff --git a/2025.05.09/02Ex/Makefile b/2025.05.09/02Ex/Makefile
new file mode 100644
index 0000000..9a7297f
--- /dev/null
+++ b/2025.05.09/02Ex/Makefile
@@ -0,0 +1,42 @@
+WFLAGS = -fstack-protector-all -W -Wall -Wextra -Wunused \
+-Wempty-body -Wlogical-op -Wold-style-declaration -Wmissing-parameter-type \
+-Wignored-qualifiers -Winit-self -Wshadow -Wtype-limits \
+-Wpointer-arith -Wformat-security -Wmissing-format-attribute -Wformat=1 \
+-Wdeclaration-after-statement -Wbad-function-cast -Wnested-externs \
+-Wmissing-prototypes -Wmissing-declarations -Wold-style-definition \
+-Wcast-align -Werror -pedantic -pedantic-errors -Wfloat-equal \
+-Wwrite-strings -Wno-long-long -std=gnu99 -Wstrict-prototypes \
+-Wmissing-field-initializers -Wpointer-sign
+
+LDFLAGS = -std=gnu99 -mfpmath=sse -O3
+LDLIBS = -lm
+
+ifeq ($(OS),Windows_NT)
+	EXE = exe
+	CLEAN = del
+	LDLIBS += -lssp
+else
+	EXE = out
+	CLEAN = rm -f
+endif
+
+TARGET = a02.$(EXE)
+OBJ = main.o solve.o init_f.o
+
+%.o: %.c
+	gcc $(WFLAGS) $(LDFLAGS) -c $< -o $@
+
+$(TARGET): $(OBJ)
+	gcc $^ -o $@ $(LDLIBS)
+
+# Отладочная сборка (gdb)
+gdb: LDFLAGS = -std=gnu99 -mfpmath=sse -g -O0
+gdb: clean $(TARGET)
+
+# Профилировочная сборка (gprof)
+prof: LDFLAGS += -pg
+prof: LDLIBS += -pg
+prof: clean $(TARGET)
+
+clean:
+	$(CLEAN) *.o *.$(EXE)
diff --git a/2025.05.09/02Ex/init_f.c b/2025.05.09/02Ex/init_f.c
new file mode 100644
index 0000000..584d534
--- /dev/null
+++ b/2025.05.09/02Ex/init_f.c
@@ -0,0 +1,61 @@
+#include "init_f.h"
+
+#include <math.h>
+
+
+static int cl = 0;
+
+int get_call_count (void) 
+{
+	return cl;
+}
+
+double f0 (double x)
+{
+	cl++;
+	(void)x;
+
+	return 1;
+}
+
+double f1 (double x)
+{
+	cl++;
+	return x + 1;
+}
+
+double f2 (double x)
+{
+	cl++;
+	return x * x + x + 1;
+}
+
+double f3 (double x)
+{
+	double x_2 = x * x;
+	cl++;
+
+	return x * x_2 + x_2 + x + 1;
+}
+
+double f4 (double x)
+{
+	double x_2 = x * x;
+	double x_3 = x_2 * x;
+	cl++;
+
+	return x * x_3 + x_3 + x_2 + x + 1;
+}
+
+double f5 (double x)
+{
+	cl++;
+	return exp(-x);
+}
+
+double f6 (double x)
+{
+	cl++;
+	return 1 / (25 * x * x + 1);
+}
+
diff --git a/2025.05.09/02Ex/init_f.h b/2025.05.09/02Ex/init_f.h
new file mode 100644
index 0000000..ee5e8e8
--- /dev/null
+++ b/2025.05.09/02Ex/init_f.h
@@ -0,0 +1,13 @@
+#ifndef INIT_F_H
+#define INIT_F_H
+
+int get_call_count (void); 
+double f0 (double x);
+double f1 (double x);
+double f2 (double x);
+double f3 (double x);
+double f4 (double x);
+double f5 (double x);
+double f6 (double x);
+
+#endif
diff --git a/2025.05.09/02Ex/main.c b/2025.05.09/02Ex/main.c
new file mode 100644
index 0000000..574d05a
--- /dev/null
+++ b/2025.05.09/02Ex/main.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+#include <float.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a02.out x h k */
+int main (int argc, char *argv[])
+{
+	double t, x, h, d;
+	int k, cl, task = 2;
+	
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 4) && 
+			sscanf(argv[1], "%lf", &x) == 1 &&
+			((sscanf(argv[2], "%lf", &h) == 1) && (h > 0)) &&
+			((sscanf(argv[3], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s x h k\n", argv[0]);
+		return -1;
+	}
+
+
+	t = clock();
+	d = t2_solve(f_lst[k], x, h);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+	
+	cl = get_call_count();
+
+	if (fabs(d - DBL_MAX) < DBL_EPSILON)
+	{
+		fprintf (stdout, "%s : Task = %d Method is not applicable Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else
+	{
+		fprintf (stdout, "%s : Task = %d Res = %e Count = %d T = %.2f\n", argv[0], task, d, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.09/02Ex/solve.c b/2025.05.09/02Ex/solve.c
new file mode 100644
index 0000000..4f64af7
--- /dev/null
+++ b/2025.05.09/02Ex/solve.c
@@ -0,0 +1,14 @@
+#include "solve.h"
+
+#include <math.h>
+#include <float.h>
+
+int t2_solve (
+		double (*f) (double), 
+		double x, double h 
+) {
+	if (h < DBL_EPSILON)
+		return DBL_MAX;
+	return (f(x + h) - f(x - h)) / (2 * h);
+}
+
diff --git a/2025.05.09/02Ex/solve.h b/2025.05.09/02Ex/solve.h
new file mode 100644
index 0000000..441ffb2
--- /dev/null
+++ b/2025.05.09/02Ex/solve.h
@@ -0,0 +1,9 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+int t2_solve (
+		double (*f) (double), 
+		double x, double h 
+);
+
+#endif
diff --git a/2025.05.09/03Ex/Makefile b/2025.05.09/03Ex/Makefile
new file mode 100644
index 0000000..4a596c2
--- /dev/null
+++ b/2025.05.09/03Ex/Makefile
@@ -0,0 +1,42 @@
+WFLAGS = -fstack-protector-all -W -Wall -Wextra -Wunused \
+-Wempty-body -Wlogical-op -Wold-style-declaration -Wmissing-parameter-type \
+-Wignored-qualifiers -Winit-self -Wshadow -Wtype-limits \
+-Wpointer-arith -Wformat-security -Wmissing-format-attribute -Wformat=1 \
+-Wdeclaration-after-statement -Wbad-function-cast -Wnested-externs \
+-Wmissing-prototypes -Wmissing-declarations -Wold-style-definition \
+-Wcast-align -Werror -pedantic -pedantic-errors -Wfloat-equal \
+-Wwrite-strings -Wno-long-long -std=gnu99 -Wstrict-prototypes \
+-Wmissing-field-initializers -Wpointer-sign
+
+LDFLAGS = -std=gnu99 -mfpmath=sse -O3
+LDLIBS = -lm
+
+ifeq ($(OS),Windows_NT)
+	EXE = exe
+	CLEAN = del
+	LDLIBS += -lssp
+else
+	EXE = out
+	CLEAN = rm -f
+endif
+
+TARGET = a03.$(EXE)
+OBJ = main.o solve.o init_f.o
+
+%.o: %.c
+	gcc $(WFLAGS) $(LDFLAGS) -c $< -o $@
+
+$(TARGET): $(OBJ)
+	gcc $^ -o $@ $(LDLIBS)
+
+# Отладочная сборка (gdb)
+gdb: LDFLAGS = -std=gnu99 -mfpmath=sse -g -O0
+gdb: clean $(TARGET)
+
+# Профилировочная сборка (gprof)
+prof: LDFLAGS += -pg
+prof: LDLIBS += -pg
+prof: clean $(TARGET)
+
+clean:
+	$(CLEAN) *.o *.$(EXE)
diff --git a/2025.05.09/03Ex/init_f.c b/2025.05.09/03Ex/init_f.c
new file mode 100644
index 0000000..584d534
--- /dev/null
+++ b/2025.05.09/03Ex/init_f.c
@@ -0,0 +1,61 @@
+#include "init_f.h"
+
+#include <math.h>
+
+
+static int cl = 0;
+
+int get_call_count (void) 
+{
+	return cl;
+}
+
+double f0 (double x)
+{
+	cl++;
+	(void)x;
+
+	return 1;
+}
+
+double f1 (double x)
+{
+	cl++;
+	return x + 1;
+}
+
+double f2 (double x)
+{
+	cl++;
+	return x * x + x + 1;
+}
+
+double f3 (double x)
+{
+	double x_2 = x * x;
+	cl++;
+
+	return x * x_2 + x_2 + x + 1;
+}
+
+double f4 (double x)
+{
+	double x_2 = x * x;
+	double x_3 = x_2 * x;
+	cl++;
+
+	return x * x_3 + x_3 + x_2 + x + 1;
+}
+
+double f5 (double x)
+{
+	cl++;
+	return exp(-x);
+}
+
+double f6 (double x)
+{
+	cl++;
+	return 1 / (25 * x * x + 1);
+}
+
diff --git a/2025.05.09/03Ex/init_f.h b/2025.05.09/03Ex/init_f.h
new file mode 100644
index 0000000..ee5e8e8
--- /dev/null
+++ b/2025.05.09/03Ex/init_f.h
@@ -0,0 +1,13 @@
+#ifndef INIT_F_H
+#define INIT_F_H
+
+int get_call_count (void); 
+double f0 (double x);
+double f1 (double x);
+double f2 (double x);
+double f3 (double x);
+double f4 (double x);
+double f5 (double x);
+double f6 (double x);
+
+#endif
diff --git a/2025.05.09/03Ex/main.c b/2025.05.09/03Ex/main.c
new file mode 100644
index 0000000..03f49a1
--- /dev/null
+++ b/2025.05.09/03Ex/main.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+#include <float.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a03.out x h k */
+int main (int argc, char *argv[])
+{
+	double t, x, h, d;
+	int k, cl, task = 3;
+	
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 4) && 
+			sscanf(argv[1], "%lf", &x) == 1 &&
+			((sscanf(argv[2], "%lf", &h) == 1) && (h > 0)) &&
+			((sscanf(argv[3], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s x h k\n", argv[0]);
+		return -1;
+	}
+
+
+	t = clock();
+	d = t3_solve(f_lst[k], x, h);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+	
+	cl = get_call_count();
+
+	if (fabs(d - DBL_MAX) < DBL_EPSILON)
+	{
+		fprintf (stdout, "%s : Task = %d Method is not applicable Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else
+	{
+		fprintf (stdout, "%s : Task = %d Res = %e Count = %d T = %.2f\n", argv[0], task, d, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.09/03Ex/solve.c b/2025.05.09/03Ex/solve.c
new file mode 100644
index 0000000..5270648
--- /dev/null
+++ b/2025.05.09/03Ex/solve.c
@@ -0,0 +1,14 @@
+#include "solve.h"
+
+#include <math.h>
+#include <float.h>
+
+int t3_solve (
+		double (*f) (double), 
+		double x, double h 
+) {
+	if (h < DBL_EPSILON)
+		return DBL_MAX;
+	return (f(x + h) - 2 * f(x) + f(x - h)) / (h * h);
+}
+
diff --git a/2025.05.09/03Ex/solve.h b/2025.05.09/03Ex/solve.h
new file mode 100644
index 0000000..c36855e
--- /dev/null
+++ b/2025.05.09/03Ex/solve.h
@@ -0,0 +1,9 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+int t3_solve (
+		double (*f) (double), 
+		double x, double h 
+);
+
+#endif
diff --git a/2025.05.09/04Ex/Makefile b/2025.05.09/04Ex/Makefile
new file mode 100644
index 0000000..0c97eb9
--- /dev/null
+++ b/2025.05.09/04Ex/Makefile
@@ -0,0 +1,42 @@
+WFLAGS = -fstack-protector-all -W -Wall -Wextra -Wunused \
+-Wempty-body -Wlogical-op -Wold-style-declaration -Wmissing-parameter-type \
+-Wignored-qualifiers -Winit-self -Wshadow -Wtype-limits \
+-Wpointer-arith -Wformat-security -Wmissing-format-attribute -Wformat=1 \
+-Wdeclaration-after-statement -Wbad-function-cast -Wnested-externs \
+-Wmissing-prototypes -Wmissing-declarations -Wold-style-definition \
+-Wcast-align -Werror -pedantic -pedantic-errors -Wfloat-equal \
+-Wwrite-strings -Wno-long-long -std=gnu99 -Wstrict-prototypes \
+-Wmissing-field-initializers -Wpointer-sign
+
+LDFLAGS = -std=gnu99 -mfpmath=sse -O3
+LDLIBS = -lm
+
+ifeq ($(OS),Windows_NT)
+	EXE = exe
+	CLEAN = del
+	LDLIBS += -lssp
+else
+	EXE = out
+	CLEAN = rm -f
+endif
+
+TARGET = a04.$(EXE)
+OBJ = main.o solve.o init_f.o
+
+%.o: %.c
+	gcc $(WFLAGS) $(LDFLAGS) -c $< -o $@
+
+$(TARGET): $(OBJ)
+	gcc $^ -o $@ $(LDLIBS)
+
+# Отладочная сборка (gdb)
+gdb: LDFLAGS = -std=gnu99 -mfpmath=sse -g -O0
+gdb: clean $(TARGET)
+
+# Профилировочная сборка (gprof)
+prof: LDFLAGS += -pg
+prof: LDLIBS += -pg
+prof: clean $(TARGET)
+
+clean:
+	$(CLEAN) *.o *.$(EXE)
diff --git a/2025.05.09/04Ex/init_f.c b/2025.05.09/04Ex/init_f.c
new file mode 100644
index 0000000..584d534
--- /dev/null
+++ b/2025.05.09/04Ex/init_f.c
@@ -0,0 +1,61 @@
+#include "init_f.h"
+
+#include <math.h>
+
+
+static int cl = 0;
+
+int get_call_count (void) 
+{
+	return cl;
+}
+
+double f0 (double x)
+{
+	cl++;
+	(void)x;
+
+	return 1;
+}
+
+double f1 (double x)
+{
+	cl++;
+	return x + 1;
+}
+
+double f2 (double x)
+{
+	cl++;
+	return x * x + x + 1;
+}
+
+double f3 (double x)
+{
+	double x_2 = x * x;
+	cl++;
+
+	return x * x_2 + x_2 + x + 1;
+}
+
+double f4 (double x)
+{
+	double x_2 = x * x;
+	double x_3 = x_2 * x;
+	cl++;
+
+	return x * x_3 + x_3 + x_2 + x + 1;
+}
+
+double f5 (double x)
+{
+	cl++;
+	return exp(-x);
+}
+
+double f6 (double x)
+{
+	cl++;
+	return 1 / (25 * x * x + 1);
+}
+
diff --git a/2025.05.09/04Ex/init_f.h b/2025.05.09/04Ex/init_f.h
new file mode 100644
index 0000000..ee5e8e8
--- /dev/null
+++ b/2025.05.09/04Ex/init_f.h
@@ -0,0 +1,13 @@
+#ifndef INIT_F_H
+#define INIT_F_H
+
+int get_call_count (void); 
+double f0 (double x);
+double f1 (double x);
+double f2 (double x);
+double f3 (double x);
+double f4 (double x);
+double f5 (double x);
+double f6 (double x);
+
+#endif
diff --git a/2025.05.09/04Ex/main.c b/2025.05.09/04Ex/main.c
new file mode 100644
index 0000000..3809d11
--- /dev/null
+++ b/2025.05.09/04Ex/main.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+#include <float.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a04.out a b n k */
+int main (int argc, char *argv[])
+{
+	double t, x, a, b;
+	int k, n, cl, task = 4;
+	
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 5) && 
+			sscanf(argv[1], "%lf", &a) == 1 &&
+			sscanf(argv[2], "%lf", &b) == 1 &&
+			((sscanf(argv[3], "%d", &n) == 1) && (n > 0)) &&
+			((sscanf(argv[4], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s x h k\n", argv[0]);
+		return -1;
+	}
+
+
+	t = clock();
+	d = t4_solve(f_lst[k], x, h);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+	
+	cl = get_call_count();
+
+	if (fabs(d - DBL_MAX) < DBL_EPSILON)
+	{
+		fprintf (stdout, "%s : Task = %d Method is not applicable Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else
+	{
+		fprintf (stdout, "%s : Task = %d Res = %e Count = %d T = %.2f\n", argv[0], task, d, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.09/04Ex/solve.c b/2025.05.09/04Ex/solve.c
new file mode 100644
index 0000000..5270648
--- /dev/null
+++ b/2025.05.09/04Ex/solve.c
@@ -0,0 +1,14 @@
+#include "solve.h"
+
+#include <math.h>
+#include <float.h>
+
+int t3_solve (
+		double (*f) (double), 
+		double x, double h 
+) {
+	if (h < DBL_EPSILON)
+		return DBL_MAX;
+	return (f(x + h) - 2 * f(x) + f(x - h)) / (h * h);
+}
+
diff --git a/2025.05.09/04Ex/solve.h b/2025.05.09/04Ex/solve.h
new file mode 100644
index 0000000..c36855e
--- /dev/null
+++ b/2025.05.09/04Ex/solve.h
@@ -0,0 +1,9 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+int t3_solve (
+		double (*f) (double), 
+		double x, double h 
+);
+
+#endif
diff --git a/2025.05.09/Example/Makefile b/2025.05.09/Example/Makefile
new file mode 100644
index 0000000..2eb337d
--- /dev/null
+++ b/2025.05.09/Example/Makefile
@@ -0,0 +1,42 @@
+WFLAGS = -fstack-protector-all -W -Wall -Wextra -Wunused \
+-Wempty-body -Wlogical-op -Wold-style-declaration -Wmissing-parameter-type \
+-Wignored-qualifiers -Winit-self -Wshadow -Wtype-limits \
+-Wpointer-arith -Wformat-security -Wmissing-format-attribute -Wformat=1 \
+-Wdeclaration-after-statement -Wbad-function-cast -Wnested-externs \
+-Wmissing-prototypes -Wmissing-declarations -Wold-style-definition \
+-Wcast-align -Werror -pedantic -pedantic-errors -Wfloat-equal \
+-Wwrite-strings -Wno-long-long -std=gnu99 -Wstrict-prototypes \
+-Wmissing-field-initializers -Wpointer-sign
+
+LDFLAGS = -std=gnu99 -mfpmath=sse -O3
+LDLIBS = -lm
+
+ifeq ($(OS),Windows_NT)
+	EXE = exe
+	CLEAN = del
+	LDLIBS += -lssp
+else
+	EXE = out
+	CLEAN = rm -f
+endif
+
+TARGET = a01.$(EXE)
+OBJ = main.o solve.o init_f.o
+
+%.o: %.c
+	gcc $(WFLAGS) $(LDFLAGS) -c $< -o $@
+
+$(TARGET): $(OBJ)
+	gcc $^ -o $@ $(LDLIBS)
+
+# Отладочная сборка (gdb)
+gdb: LDFLAGS = -std=gnu99 -mfpmath=sse -g -O0
+gdb: clean $(TARGET)
+
+# Профилировочная сборка (gprof)
+prof: LDFLAGS += -pg
+prof: LDLIBS += -pg
+prof: clean $(TARGET)
+
+clean:
+	$(CLEAN) *.o *$(EXE)
diff --git a/2025.05.09/Example/init_f.c b/2025.05.09/Example/init_f.c
new file mode 100644
index 0000000..584d534
--- /dev/null
+++ b/2025.05.09/Example/init_f.c
@@ -0,0 +1,61 @@
+#include "init_f.h"
+
+#include <math.h>
+
+
+static int cl = 0;
+
+int get_call_count (void) 
+{
+	return cl;
+}
+
+double f0 (double x)
+{
+	cl++;
+	(void)x;
+
+	return 1;
+}
+
+double f1 (double x)
+{
+	cl++;
+	return x + 1;
+}
+
+double f2 (double x)
+{
+	cl++;
+	return x * x + x + 1;
+}
+
+double f3 (double x)
+{
+	double x_2 = x * x;
+	cl++;
+
+	return x * x_2 + x_2 + x + 1;
+}
+
+double f4 (double x)
+{
+	double x_2 = x * x;
+	double x_3 = x_2 * x;
+	cl++;
+
+	return x * x_3 + x_3 + x_2 + x + 1;
+}
+
+double f5 (double x)
+{
+	cl++;
+	return exp(-x);
+}
+
+double f6 (double x)
+{
+	cl++;
+	return 1 / (25 * x * x + 1);
+}
+
diff --git a/2025.05.09/Example/init_f.h b/2025.05.09/Example/init_f.h
new file mode 100644
index 0000000..ee5e8e8
--- /dev/null
+++ b/2025.05.09/Example/init_f.h
@@ -0,0 +1,13 @@
+#ifndef INIT_F_H
+#define INIT_F_H
+
+int get_call_count (void); 
+double f0 (double x);
+double f1 (double x);
+double f2 (double x);
+double f3 (double x);
+double f4 (double x);
+double f5 (double x);
+double f6 (double x);
+
+#endif
diff --git a/2025.05.09/Example/main.c b/2025.05.09/Example/main.c
new file mode 100644
index 0000000..90920e6
--- /dev/null
+++ b/2025.05.09/Example/main.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+#include <float.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a01.out x h k */
+int main (int argc, char *argv[])
+{
+	double t, x, h, d;
+	int k, cl, task = 1;
+	
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 4) && 
+			sscanf(argv[1], "%lf", &x) == 1 &&
+			((sscanf(argv[2], "%lf", &h) == 1) && (h > 0)) &&
+			((sscanf(argv[3], "%d", &k) == 1) && ((0 <= k) && (k <= len_f))))
+	) {
+		fprintf(stderr, "Usage: %s x h k\n", argv[0]);
+		return -1;
+	}
+
+
+	t = clock();
+	d = t1_solve(f_lst[k], x, h);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+	
+	cl = get_call_count();
+
+	if (fabs(d - DBL_MAX) < DBL_EPSILON)
+	{
+		fprintf (stdout, "%s : Task = %d Method is not applicable Count = %d T = %.2f\n", argv[0], task, cl, t);
+		return -2;
+	} else
+	{
+		fprintf (stdout, "%s : Task = %d Res = %e Count = %d T = %.2f\n", argv[0], task, d, cl, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.09/Example/solve.c b/2025.05.09/Example/solve.c
new file mode 100644
index 0000000..c167e37
--- /dev/null
+++ b/2025.05.09/Example/solve.c
@@ -0,0 +1,14 @@
+#include "solve.h"
+
+#include <math.h>
+#include <float.h>
+
+int t1_solve (
+		double (*f) (double), 
+		double x, double h 
+) {
+	if (h < DBL_EPSILON)
+		return DBL_MAX;
+	return (f(x + h) - f(x)) / h;
+}
+
diff --git a/2025.05.09/Example/solve.h b/2025.05.09/Example/solve.h
new file mode 100644
index 0000000..3d511de
--- /dev/null
+++ b/2025.05.09/Example/solve.h
@@ -0,0 +1,9 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+int t1_solve (
+		double (*f) (double), 
+		double x, double h 
+);
+
+#endif
diff --git a/2025.05.09/tests/2nd_must_find_test.sh b/2025.05.09/tests/2nd_must_find_test.sh
new file mode 100755
index 0000000..aa05613
--- /dev/null
+++ b/2025.05.09/tests/2nd_must_find_test.sh
@@ -0,0 +1,17 @@
+script_name="$(basename "$0")"
+mkdir -p tests
+
+if [ "$#" -ne 1 ]; then
+	echo "The number of parameters is not equal 1"
+	exit 1
+fi
+
+make
+
+for (( k = 0 ; k < 7; k++ )); do 
+	echo "------- K = $k -------"
+	for (( a = -100 ; a < 100 ; a++ )); do 
+		echo "k = $k x_0 = "$(echo "$a / 10" | bc -l)" ---"
+		./a0$1.out "$(echo "$a / 10" | bc -l)" 1e-14 $k
+	done
+done >$(pwd)/tests/out_$script_name.log 2>$(pwd)/tests/err_$script_name.log