diff --git a/2025.05.23/01Ex/io_node.c b/2025.05.23/01Ex/io_node.c
index ef5458d..254db40 100644
--- a/2025.05.23/01Ex/io_node.c
+++ b/2025.05.23/01Ex/io_node.c
@@ -68,6 +68,9 @@ io_status read_list (node **list, const char *filename)
 
 		lunit = unit;
 	}
+	
+	if (!head)
+		return ERR_READ;
 
 	*list = head;
 
diff --git a/2025.05.23/02Ex/io_node.c b/2025.05.23/02Ex/io_node.c
index ef5458d..254db40 100644
--- a/2025.05.23/02Ex/io_node.c
+++ b/2025.05.23/02Ex/io_node.c
@@ -68,6 +68,9 @@ io_status read_list (node **list, const char *filename)
 
 		lunit = unit;
 	}
+	
+	if (!head)
+		return ERR_READ;
 
 	*list = head;
 
diff --git a/2025.05.23/03Ex/io_node.c b/2025.05.23/03Ex/io_node.c
index ef5458d..254db40 100644
--- a/2025.05.23/03Ex/io_node.c
+++ b/2025.05.23/03Ex/io_node.c
@@ -68,6 +68,9 @@ io_status read_list (node **list, const char *filename)
 
 		lunit = unit;
 	}
+	
+	if (!head)
+		return ERR_READ;
 
 	*list = head;
 
diff --git a/2025.05.23/05Ex/io_node.c b/2025.05.23/05Ex/io_node.c
index ef5458d..254db40 100644
--- a/2025.05.23/05Ex/io_node.c
+++ b/2025.05.23/05Ex/io_node.c
@@ -68,6 +68,9 @@ io_status read_list (node **list, const char *filename)
 
 		lunit = unit;
 	}
+	
+	if (!head)
+		return ERR_READ;
 
 	*list = head;
 
diff --git a/2025.05.23/06Ex/Makefile b/2025.05.23/06Ex/Makefile
new file mode 100644
index 0000000..ad1005f
--- /dev/null
+++ b/2025.05.23/06Ex/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 io_node.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/2025.05.23/06Ex/input/a.txt b/2025.05.23/06Ex/input/a.txt
new file mode 100644
index 0000000..1637522
--- /dev/null
+++ b/2025.05.23/06Ex/input/a.txt
@@ -0,0 +1,10 @@
+a
+a
+a
+b
+b
+b
+c
+d
+d
+d
diff --git a/2025.05.23/06Ex/io_node.c b/2025.05.23/06Ex/io_node.c
new file mode 100644
index 0000000..254db40
--- /dev/null
+++ b/2025.05.23/06Ex/io_node.c
@@ -0,0 +1,86 @@
+#include "io_node.h"
+#include "node.h"
+#include "status.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int get_length (node * head)
+{
+	node *curr;
+
+	int i = 0;
+	for (curr = head; curr; curr=curr->next)
+		i++;
+
+	return i;
+}
+
+void delete_list (node * head)
+{
+	node *curr, *next;
+	for (curr = head; curr; curr = next) {
+		next = curr->next;
+		free(curr->string);
+		free(curr);
+	}
+}
+
+io_status read_list (node **list, const char *filename)
+{
+	FILE *fp = 0;
+	char *string, buf[LEN_STR];
+	node *head, *lunit, *unit;
+
+	head = lunit = unit = NULL;
+
+	if (!(fp = fopen(filename, "r"))) 
+		return ERR_OPEN;
+
+	while (fgets(buf, LEN_STR, fp))
+	{
+		unit = (node *)malloc(sizeof(node));
+		if (!unit) {
+			fclose(fp);
+			delete_list(head);
+			
+			return ERR_MEM;
+		}
+
+		unit->next = NULL;
+		
+		buf[strcspn(buf, "\n")] = '\0';
+		string = strdup(buf);
+		if (!string) {
+			fclose(fp);
+			free(unit);
+			delete_list(head);
+
+			return ERR_MEM;
+		}
+
+		unit->string = string;
+		if (!lunit) 
+			head = unit;
+		else
+			lunit->next = unit;
+
+		lunit = unit;
+	}
+	
+	if (!head)
+		return ERR_READ;
+
+	*list = head;
+
+	fclose(fp);
+	return SUCCESS;
+}
+
+void print_list (node *head, const int p)
+{
+	for (int i = 0; head && i < p; head = head->next, i++)
+		printf("%s\n", head->string);
+}
+
diff --git a/2025.05.23/06Ex/io_node.h b/2025.05.23/06Ex/io_node.h
new file mode 100644
index 0000000..0040f0d
--- /dev/null
+++ b/2025.05.23/06Ex/io_node.h
@@ -0,0 +1,12 @@
+#ifndef IO_NODE_H
+#define IO_NODE_H
+
+#include "node.h"
+#include "status.h"
+
+int get_length (node * head);
+void delete_list (node * head);
+io_status read_list (node **list, const char *filename);
+void print_list (node *head, const int p);
+
+#endif
diff --git a/2025.05.23/06Ex/main.c b/2025.05.23/06Ex/main.c
new file mode 100644
index 0000000..9c21d7c
--- /dev/null
+++ b/2025.05.23/06Ex/main.c
@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+#include <float.h>
+
+#include "solve.h"
+#include "node.h"
+#include "io_node.h"
+#include "status.h"
+
+/* ./a06.out p filename */
+int main (int argc, char *argv[])
+{
+	node *head;
+	char *name;
+	double t;
+	int p, res, task = 6;
+	io_status ret;
+
+	if (
+			!((argc == 3) && 
+			sscanf(argv[1], "%d", &p) == 1 &&
+			argv[2])
+	) {
+		fprintf(stderr, "Usage: %s p filename\n", argv[0]);
+		return -1;
+	}
+
+	name = argv[2];
+
+	ret = read_list(&head, name);
+	do {
+		switch (ret) {
+			case SUCCESS:
+				continue;
+			case ERR_OPEN:
+				fprintf (stderr, "%s '%s'!\n", ERR_MSG_OPEN, name);
+				break;
+			case ERR_READ:
+				fprintf (stderr, "%s '%s'!\n", ERR_MSG_READ, name);
+				break;
+			case ERR_MEM:
+				fprintf (stderr, "%s!\n", ERR_MSG_MEM);
+				break;
+		}
+
+		delete_list(head);
+		return -2;
+	} while (0);	
+
+	print_list(head, p);
+
+	t = clock();
+	res = t6_solve(head);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+	
+	delete_list(head);
+
+	if (res < 0) {
+		fprintf (stderr, "%s : Task = %d Undefined error Elapsed = %.2f\n", argv[0], task, t);
+		return -3;
+	} else {
+		fprintf (stdout, "%s : Task = %d Result = %d Elapsed = %.2f\n", argv[0], task, res, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.23/06Ex/node.h b/2025.05.23/06Ex/node.h
new file mode 100644
index 0000000..18cff38
--- /dev/null
+++ b/2025.05.23/06Ex/node.h
@@ -0,0 +1,14 @@
+#ifndef NODE_H
+#define NODE_H
+
+#define LEN_STR 1234
+
+struct _node;
+
+typedef struct _node
+{
+	char *string;
+	struct _node *next;
+} node;
+
+#endif
diff --git a/2025.05.23/06Ex/solve.c b/2025.05.23/06Ex/solve.c
new file mode 100644
index 0000000..5210f6e
--- /dev/null
+++ b/2025.05.23/06Ex/solve.c
@@ -0,0 +1,20 @@
+#include "solve.h"
+#include "node.h"
+
+#include <string.h>
+
+int t6_solve (node *head)
+{
+	char *last = head->string;
+	int count = 1;
+
+	for (head = head->next; head; head = head->next)
+	{
+		if (strcmp(head->string, last))
+			count++;
+		last = head->string;
+	}
+
+	return count;
+}
+
diff --git a/2025.05.23/06Ex/solve.h b/2025.05.23/06Ex/solve.h
new file mode 100644
index 0000000..dbf48a3
--- /dev/null
+++ b/2025.05.23/06Ex/solve.h
@@ -0,0 +1,8 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+#include "node.h"
+
+int t6_solve (node *head);
+
+#endif
diff --git a/2025.05.23/06Ex/status.h b/2025.05.23/06Ex/status.h
new file mode 100644
index 0000000..38b6e67
--- /dev/null
+++ b/2025.05.23/06Ex/status.h
@@ -0,0 +1,16 @@
+#ifndef STATUS_H
+#define STATUS_H
+
+#define ERR_MSG_MEM	"Error: Not enough memory"
+#define ERR_MSG_OPEN	"Error: Cannot open file"
+#define ERR_MSG_READ	"Error: Cannot read file"
+
+typedef enum
+{
+	SUCCESS,
+	ERR_OPEN = -1,
+	ERR_READ = -2,
+	ERR_MEM = -3
+} io_status;
+
+#endif
diff --git a/2025.05.23/07Ex/Makefile b/2025.05.23/07Ex/Makefile
new file mode 100644
index 0000000..7271288
--- /dev/null
+++ b/2025.05.23/07Ex/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 ($(OS),Windows_NT)
+	EXE = exe
+	CLEAN = del
+	LDLIBS += -lssp
+else
+	EXE = out
+	CLEAN = rm -f
+endif
+
+TARGET = a07.$(EXE)
+OBJ = main.o solve.o io_node.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/2025.05.23/07Ex/input/a.txt b/2025.05.23/07Ex/input/a.txt
new file mode 100644
index 0000000..06e607e
--- /dev/null
+++ b/2025.05.23/07Ex/input/a.txt
@@ -0,0 +1,16 @@
+a
+b
+d
+e
+c
+c
+c
+
+d
+d
+d
+d
+a
+a
+a
+
diff --git a/2025.05.23/07Ex/input/f.txt b/2025.05.23/07Ex/input/f.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2025.05.23/07Ex/io_node.c b/2025.05.23/07Ex/io_node.c
new file mode 100644
index 0000000..254db40
--- /dev/null
+++ b/2025.05.23/07Ex/io_node.c
@@ -0,0 +1,86 @@
+#include "io_node.h"
+#include "node.h"
+#include "status.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int get_length (node * head)
+{
+	node *curr;
+
+	int i = 0;
+	for (curr = head; curr; curr=curr->next)
+		i++;
+
+	return i;
+}
+
+void delete_list (node * head)
+{
+	node *curr, *next;
+	for (curr = head; curr; curr = next) {
+		next = curr->next;
+		free(curr->string);
+		free(curr);
+	}
+}
+
+io_status read_list (node **list, const char *filename)
+{
+	FILE *fp = 0;
+	char *string, buf[LEN_STR];
+	node *head, *lunit, *unit;
+
+	head = lunit = unit = NULL;
+
+	if (!(fp = fopen(filename, "r"))) 
+		return ERR_OPEN;
+
+	while (fgets(buf, LEN_STR, fp))
+	{
+		unit = (node *)malloc(sizeof(node));
+		if (!unit) {
+			fclose(fp);
+			delete_list(head);
+			
+			return ERR_MEM;
+		}
+
+		unit->next = NULL;
+		
+		buf[strcspn(buf, "\n")] = '\0';
+		string = strdup(buf);
+		if (!string) {
+			fclose(fp);
+			free(unit);
+			delete_list(head);
+
+			return ERR_MEM;
+		}
+
+		unit->string = string;
+		if (!lunit) 
+			head = unit;
+		else
+			lunit->next = unit;
+
+		lunit = unit;
+	}
+	
+	if (!head)
+		return ERR_READ;
+
+	*list = head;
+
+	fclose(fp);
+	return SUCCESS;
+}
+
+void print_list (node *head, const int p)
+{
+	for (int i = 0; head && i < p; head = head->next, i++)
+		printf("%s\n", head->string);
+}
+
diff --git a/2025.05.23/07Ex/io_node.h b/2025.05.23/07Ex/io_node.h
new file mode 100644
index 0000000..0040f0d
--- /dev/null
+++ b/2025.05.23/07Ex/io_node.h
@@ -0,0 +1,12 @@
+#ifndef IO_NODE_H
+#define IO_NODE_H
+
+#include "node.h"
+#include "status.h"
+
+int get_length (node * head);
+void delete_list (node * head);
+io_status read_list (node **list, const char *filename);
+void print_list (node *head, const int p);
+
+#endif
diff --git a/2025.05.23/07Ex/main.c b/2025.05.23/07Ex/main.c
new file mode 100644
index 0000000..19405b8
--- /dev/null
+++ b/2025.05.23/07Ex/main.c
@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+#include <float.h>
+
+#include "solve.h"
+#include "node.h"
+#include "io_node.h"
+#include "status.h"
+
+/* ./a07.out p filename */
+int main (int argc, char *argv[])
+{
+	node *head;
+	char *name;
+	double t;
+	int p, res, task = 7;
+	io_status ret;
+
+	if (
+			!((argc == 3) && 
+			sscanf(argv[1], "%d", &p) == 1 &&
+			argv[2])
+	) {
+		fprintf(stderr, "Usage: %s p filename\n", argv[0]);
+		return -1;
+	}
+
+	name = argv[2];
+
+	ret = read_list(&head, name);
+	do {
+		switch (ret) {
+			case SUCCESS:
+				continue;
+			case ERR_OPEN:
+				fprintf (stderr, "%s '%s'!\n", ERR_MSG_OPEN, name);
+				break;
+			case ERR_READ:
+				fprintf (stderr, "%s '%s'!\n", ERR_MSG_READ, name);
+				break;
+			case ERR_MEM:
+				fprintf (stderr, "%s!\n", ERR_MSG_MEM);
+				break;
+		}
+
+		delete_list(head);
+		return -2;
+	} while (0);	
+
+	print_list(head, p);
+	
+	t = clock();
+	res = t7_solve(head);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+	
+	delete_list(head);
+
+	if (res < 0) {
+		fprintf (stderr, "%s : Task = %d Undefined error Elapsed = %.2f\n", argv[0], task, t);
+		return -3;
+	} else {
+		fprintf (stdout, "%s : Task = %d Result = %d Elapsed = %.2f\n", argv[0], task, res, t);
+		return 0;
+	}
+}
+
diff --git a/2025.05.23/07Ex/node.h b/2025.05.23/07Ex/node.h
new file mode 100644
index 0000000..18cff38
--- /dev/null
+++ b/2025.05.23/07Ex/node.h
@@ -0,0 +1,14 @@
+#ifndef NODE_H
+#define NODE_H
+
+#define LEN_STR 1234
+
+struct _node;
+
+typedef struct _node
+{
+	char *string;
+	struct _node *next;
+} node;
+
+#endif
diff --git a/2025.05.23/07Ex/solve.c b/2025.05.23/07Ex/solve.c
new file mode 100644
index 0000000..70463eb
--- /dev/null
+++ b/2025.05.23/07Ex/solve.c
@@ -0,0 +1,28 @@
+#include "solve.h"
+#include "node.h"
+
+#include <string.h>
+
+int t7_solve (node *head)
+{
+	char *last = head->string;
+	int maximum = 0, count = 1;
+
+	for (head = head->next; head; head = head->next)
+	{
+		if (strcmp(head->string, last))
+			count++;
+		else {
+			if (maximum < (count-1))
+				maximum = count-1;
+			count = 0;	
+		}
+		last = head->string;
+	}
+
+	if (maximum < count)
+		maximum = count;
+
+	return maximum;
+}
+
diff --git a/2025.05.23/07Ex/solve.h b/2025.05.23/07Ex/solve.h
new file mode 100644
index 0000000..e35b281
--- /dev/null
+++ b/2025.05.23/07Ex/solve.h
@@ -0,0 +1,8 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+#include "node.h"
+
+int t7_solve (node *head);
+
+#endif
diff --git a/2025.05.23/07Ex/status.h b/2025.05.23/07Ex/status.h
new file mode 100644
index 0000000..38b6e67
--- /dev/null
+++ b/2025.05.23/07Ex/status.h
@@ -0,0 +1,16 @@
+#ifndef STATUS_H
+#define STATUS_H
+
+#define ERR_MSG_MEM	"Error: Not enough memory"
+#define ERR_MSG_OPEN	"Error: Cannot open file"
+#define ERR_MSG_READ	"Error: Cannot read file"
+
+typedef enum
+{
+	SUCCESS,
+	ERR_OPEN = -1,
+	ERR_READ = -2,
+	ERR_MEM = -3
+} io_status;
+
+#endif