diff --git a/2025.04.04/asymptotics_test/asymptotics.xlsx b/2025.04.04/asymptotics_test/asymptotics.xlsx
new file mode 100644
index 0000000..48f80d6
Binary files /dev/null and b/2025.04.04/asymptotics_test/asymptotics.xlsx differ
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/asymptotics.xlsx b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/asymptotics.xlsx
deleted file mode 100644
index 1374bd1..0000000
Binary files a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/asymptotics.xlsx and /dev/null differ
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_01000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_01000.log
deleted file mode 100644
index c7b7c49..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_01000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00  1.890e-15 -4.851e-16
-  1.000e+00 -2.000e+00  1.000e+00  4.820e-27
-  1.110e-16  1.000e+00 -2.000e+00  1.000e+00
- -2.220e-16 -1.332e-15  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 4.725103e-09 Res2 = 5.398199e-10 Elapsed = 0.78 K = 2 N = 1000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_02000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_02000.log
deleted file mode 100644
index 0b23562..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_02000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00 -1.787e-15  4.055e-16
-  1.000e+00 -2.000e+00  1.000e+00 -4.626e-25
-  2.866e-27  1.000e+00 -2.000e+00  1.000e+00
-  1.018e-28 -4.441e-16  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 2.747140e-08 Res2 = 2.397914e-09 Elapsed = 8.07 K = 2 N = 2000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_03000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_03000.log
deleted file mode 100644
index bee3f01..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_03000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00  1.264e-15  2.400e-15
-  1.000e+00 -2.000e+00  1.000e+00 -4.996e-16
-  2.220e-16  1.000e+00 -2.000e+00  1.000e+00
-  5.551e-17  2.220e-16  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 8.237660e-08 Res2 = 4.537065e-09 Elapsed = 26.56 K = 2 N = 3000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_04000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_04000.log
deleted file mode 100644
index 3af81de..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_04000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00 -2.785e-16  3.760e-15
-  1.000e+00 -2.000e+00  1.000e+00 -5.551e-17
-  4.441e-16  1.000e+00 -2.000e+00  1.000e+00
-  1.249e-16 -4.718e-16  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 1.618474e-07 Res2 = 9.359467e-09 Elapsed = 64.23 K = 2 N = 4000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_05000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_05000.log
deleted file mode 100644
index 302b29a..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_05000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00 -8.688e-16  3.613e-15
-  1.000e+00 -2.000e+00  1.000e+00  5.551e-17
-  3.886e-16  1.000e+00 -2.000e+00  1.000e+00
- -8.419e-16  8.882e-16  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 0.000000e+00 Res2 = 0.000000e+00 Elapsed = 125.04 K = 2 N = 5000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_06000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_06000.log
deleted file mode 100644
index df5e12f..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_06000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00  1.008e-15  1.178e-15
-  1.000e+00 -2.000e+00  1.000e+00 -8.327e-17
-  1.117e-27  1.000e+00 -2.000e+00  1.000e+00
-  9.252e-17 -2.591e-16  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 0.000000e+00 Res2 = 0.000000e+00 Elapsed = 218.34 K = 2 N = 6000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_07000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_07000.log
deleted file mode 100644
index 6e2850d..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_07000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00  1.023e-15  1.463e-15
-  1.000e+00 -2.000e+00  1.000e+00 -1.527e-15
- -2.776e-16  1.000e+00 -2.000e+00  1.000e+00
- -3.701e-17  5.181e-16  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 0.000000e+00 Res2 = 0.000000e+00 Elapsed = 341.54 K = 2 N = 7000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_08000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_08000.log
deleted file mode 100644
index 539bd18..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_08000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00  5.577e-16 -5.966e-16
-  1.000e+00 -2.000e+00  1.000e+00 -6.106e-16
- -5.476e-24  1.000e+00 -2.000e+00  1.000e+00
- -2.498e-16  1.665e-16  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 0.000000e+00 Res2 = 0.000000e+00 Elapsed = 511.43 K = 2 N = 8000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_09000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_09000.log
deleted file mode 100644
index 6daa140..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_09000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00 -1.369e-16 -2.453e-15
-  1.000e+00 -2.000e+00  1.000e+00 -1.277e-15
-  4.441e-16  1.000e+00 -2.000e+00  1.000e+00
- -2.961e-16 -1.134e-23  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 0.000000e+00 Res2 = 0.000000e+00 Elapsed = 728.62 K = 2 N = 9000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_10000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_10000.log
deleted file mode 100644
index 8ee4240..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_10000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00  2.090e-15 -1.853e-15
-  1.000e+00 -2.000e+00  1.000e+00  7.772e-16
-  3.886e-16  1.000e+00 -2.000e+00  1.000e+00
- -2.553e-27 -3.331e-16  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 0.000000e+00 Res2 = 0.000000e+00 Elapsed = 1007.83 K = 2 N = 10000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_11000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_11000.log
deleted file mode 100644
index 48096b4..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_11000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00 -5.878e-16  2.292e-15
-  1.000e+00 -2.000e+00  1.000e+00 -9.576e-16
-  1.110e-16  1.000e+00 -2.000e+00  1.000e+00
-  3.886e-16  1.110e-16  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 0.000000e+00 Res2 = 0.000000e+00 Elapsed = 1330.51 K = 2 N = 11000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_12000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_12000.log
deleted file mode 100644
index 9e59aeb..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_12000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00 -5.274e-15  1.485e-15
-  1.000e+00 -2.000e+00  1.000e+00 -8.327e-17
-  2.220e-16  1.000e+00 -2.000e+00  1.000e+00
- -4.441e-16 -4.441e-16  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 0.000000e+00 Res2 = 0.000000e+00 Elapsed = 1718.64 K = 2 N = 12000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_13000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_13000.log
deleted file mode 100644
index 305dcdf..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_13000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00 -5.159e-15 -9.207e-17
-  1.000e+00 -2.000e+00  1.000e+00 -4.441e-16
- -2.220e-16  1.000e+00 -2.000e+00  1.000e+00
-  2.220e-16 -2.220e-16  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 0.000000e+00 Res2 = 0.000000e+00 Elapsed = 2181.13 K = 2 N = 13000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_14000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_14000.log
deleted file mode 100644
index 82d9aca..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_14000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00 -4.055e-15  2.933e-15
-  1.000e+00 -2.000e+00  1.000e+00 -8.882e-16
-  6.106e-16  1.000e+00 -2.000e+00  1.000e+00
- -1.110e-16  2.206e-26  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 0.000000e+00 Res2 = 0.000000e+00 Elapsed = 2731.38 K = 2 N = 14000
diff --git a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_15000.log b/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_15000.log
deleted file mode 100644
index 9366e16..0000000
--- a/2025.04.04/dist/Krivoruchenko_SK/asymptotics_test/test_out_15000.log
+++ /dev/null
@@ -1,11 +0,0 @@
-Initial matrix:
-  1.000e+00  2.000e+00  3.000e+00  4.000e+00
-  2.000e+00  2.000e+00  3.000e+00  4.000e+00
-  3.000e+00  3.000e+00  3.000e+00  4.000e+00
-  4.000e+00  4.000e+00  4.000e+00  4.000e+00
-Inverse matrix:
- -1.000e+00  1.000e+00 -4.133e-16  6.973e-15
-  1.000e+00 -2.000e+00  1.000e+00 -3.331e-16
-  9.992e-16  1.000e+00 -2.000e+00  1.000e+00
- -8.882e-16  2.220e-15  1.000e+00 -2.000e+00
-./a.out : Task = 14 Res1 = 0.000000e+00 Res2 = 0.000000e+00 Elapsed = 3362.89 K = 2 N = 15000
diff --git a/2025.04.04/test/1/a1.txt b/2025.04.04/test/1/a1.txt
deleted file mode 120000
index 8d14cbf..0000000
--- a/2025.04.04/test/1/a1.txt
+++ /dev/null
@@ -1 +0,0 @@
-a.txt
\ No newline at end of file
diff --git a/2025.04.04/test/1/a.txt b/2025.04.04/tests/1/a.txt
similarity index 100%
rename from 2025.04.04/test/1/a.txt
rename to 2025.04.04/tests/1/a.txt
diff --git a/2025.04.04/tests/1/a1.txt b/2025.04.04/tests/1/a1.txt
new file mode 100644
index 0000000..8d14cbf
--- /dev/null
+++ b/2025.04.04/tests/1/a1.txt
@@ -0,0 +1 @@
+a.txt
\ No newline at end of file
diff --git a/2025.04.04/test/1/b.txt b/2025.04.04/tests/1/b.txt
similarity index 100%
rename from 2025.04.04/test/1/b.txt
rename to 2025.04.04/tests/1/b.txt
diff --git a/2025.04.04/test/1/c.txt b/2025.04.04/tests/1/c.txt
similarity index 100%
rename from 2025.04.04/test/1/c.txt
rename to 2025.04.04/tests/1/c.txt
diff --git a/2025.04.04/test/1/c_b.txt b/2025.04.04/tests/1/c_b.txt
similarity index 100%
rename from 2025.04.04/test/1/c_b.txt
rename to 2025.04.04/tests/1/c_b.txt
diff --git a/2025.04.04/test/1/c_x.txt b/2025.04.04/tests/1/c_x.txt
similarity index 100%
rename from 2025.04.04/test/1/c_x.txt
rename to 2025.04.04/tests/1/c_x.txt
diff --git a/2025.04.04/test/1/d.txt b/2025.04.04/tests/1/d.txt
similarity index 100%
rename from 2025.04.04/test/1/d.txt
rename to 2025.04.04/tests/1/d.txt
diff --git a/2025.04.04/test/1/e.txt b/2025.04.04/tests/1/e.txt
similarity index 100%
rename from 2025.04.04/test/1/e.txt
rename to 2025.04.04/tests/1/e.txt
diff --git a/2025.04.04/test/1/f.txt b/2025.04.04/tests/1/f.txt
similarity index 100%
rename from 2025.04.04/test/1/f.txt
rename to 2025.04.04/tests/1/f.txt
diff --git a/2025.04.04/test/1/g.txt b/2025.04.04/tests/1/g.txt
similarity index 100%
rename from 2025.04.04/test/1/g.txt
rename to 2025.04.04/tests/1/g.txt
diff --git a/2025.04.04/test/1/g1.txt b/2025.04.04/tests/1/g1.txt
similarity index 100%
rename from 2025.04.04/test/1/g1.txt
rename to 2025.04.04/tests/1/g1.txt
diff --git a/2025.04.04/test/1/g2.txt b/2025.04.04/tests/1/g2.txt
similarity index 100%
rename from 2025.04.04/test/1/g2.txt
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diff --git a/2025.04.04/test/1/h.txt b/2025.04.04/tests/1/h.txt
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diff --git a/2025.04.18/01Ex/Makefile b/2025.04.18/01Ex/Makefile
new file mode 100644
index 0000000..7b9f020
--- /dev/null
+++ b/2025.04.18/01Ex/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
+
+CFLAGS = -std=gnu99 -mfpmath=sse -O3
+
+ifeq ($(OS),Windows_NT)
+	EXE = exe
+	CLEAN = del
+	LFLAGS = -lssp -lm
+else
+	EXE = out
+	CLEAN = rm -f
+	LFLAGS = -lm
+endif
+
+TARGET = a01.$(EXE)
+OBJ = main.o solve.o array_io.o
+
+%.o: %.c
+	gcc $(CFLAGS) $(WFLAGS) -c $< -o $@
+
+$(TARGET): $(OBJ)
+	gcc $^ -o $@ $(LFLAGS)
+
+# Отладочная сборка (gdb)
+gdb: CFLAGS = -mfpmath=sse -std=gnu99 -g -O0
+gdb: clean $(TARGET)
+
+# Профилировочная сборка (gprof)
+prof: CFLAGS = -std=gnu99 -mfpmath=sse -pg -O3
+prof: LFLAGS = -lm -pg
+prof: clean $(TARGET)
+
+clean:
+	$(CLEAN) *.o *$(EXE)
diff --git a/2025.04.18/01Ex/array_io.c b/2025.04.18/01Ex/array_io.c
new file mode 100644
index 0000000..780f0a3
--- /dev/null
+++ b/2025.04.18/01Ex/array_io.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <string.h>
+#include "array_io.h"
+
+io_status read_values (double * restrict X, double * restrict Y, const int n, const char * restrict name)
+{
+	FILE *fp;
+	if (!(fp = fopen(name, "r"))) 
+		return ERROR_OPEN;
+
+	for (int i = 0; i < n; ++i)
+		if (fscanf(fp, "%lf\t%lf", X + i, Y + i) != 2)
+		{ fclose(fp); return ERROR_READ; }
+
+	fclose(fp);
+	return SUCCESS;
+}
+
+void print_values (const double * restrict X, const double * restrict Y, const int n, const int p)
+{
+	int np = (n > p ? p : n);
+
+	for (int i = 0; i < np; i++)
+		printf("f(%lf) = %lf\n", X[i], Y[i]);
+}
+
diff --git a/2025.04.18/01Ex/array_io.h b/2025.04.18/01Ex/array_io.h
new file mode 100644
index 0000000..7a0ce14
--- /dev/null
+++ b/2025.04.18/01Ex/array_io.h
@@ -0,0 +1,9 @@
+#ifndef ARRAY_IO_H
+#define ARRAY_IO_H
+
+#include "io_status.h"
+
+io_status read_values (double * restrict X, double * restrict Y, const int n, const char * restrict name);
+void print_values (const double * restrict X, const double * restrict Y, const int n, const int p);
+
+#endif
diff --git a/2025.04.18/01Ex/io_status.h b/2025.04.18/01Ex/io_status.h
new file mode 100644
index 0000000..778a4a1
--- /dev/null
+++ b/2025.04.18/01Ex/io_status.h
@@ -0,0 +1,15 @@
+#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"
+
+typedef enum _io_status
+{
+	SUCCESS,
+	ERROR_OPEN,
+	ERROR_READ
+} io_status;
+
+#endif
diff --git a/2025.04.18/01Ex/main.c b/2025.04.18/01Ex/main.c
new file mode 100644
index 0000000..e8759e8
--- /dev/null
+++ b/2025.04.18/01Ex/main.c
@@ -0,0 +1,74 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include "array_io.h"
+#include "io_status.h"
+#include "solve.h"
+
+/* ./a.out x_0 n filename */
+int main(int argc, char *argv[])
+{
+	double x_0, t, r = 0, *X = 0, *Y = 0;
+	int n, task = 1;
+	char *name = 0;
+	io_status ret;
+
+	if (
+			!((argc == 4) && 
+			sscanf(argv[1], "%lf", &x_0) == 1 &&
+			sscanf(argv[2], "%d", &n) == 1 &&
+			((name = argv[3]) && name))
+	) {
+		fprintf(stderr, "Usage: %s x_0 n filename\n", argv[0]);
+		return 1;
+	}
+
+	// TODO: Удалить вывод в stderr
+	X = (double *)malloc(n * sizeof(double));
+	if (!X)
+	{
+		fprintf(stderr, "%s\n", ERR_MEM);
+		return 2;
+	}
+	
+	Y = (double *)malloc(n * sizeof(double));
+	if (!Y)
+	{
+		free(X);
+		fprintf(stderr, "%s\n", ERR_MEM);
+		return 2;
+	}
+
+	ret = read_values(X, Y, n, name);
+	do {
+		switch (ret)
+		{
+			case SUCCESS:
+				continue;
+			case ERROR_OPEN:	
+				fprintf(stderr, "%s '%s'!\n", ERR_OPEN, name);
+				break;
+			case ERROR_READ:
+				fprintf(stderr, "%s '%s'!\n", ERR_READ, name);
+				break;
+		}
+
+		free(X);
+		free(Y);
+
+		return 3; 
+	} while (0);
+
+	t = clock();
+	r = t1_solve(x_0, n, X, Y);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+	
+	printf("%s : Task = %d Result = %e Elapsed = %.2f\n", argv[0], task, r, t);
+
+	free(X);
+	free(Y);
+
+	return 0;
+}
+
diff --git a/2025.04.18/01Ex/solve.c b/2025.04.18/01Ex/solve.c
new file mode 100644
index 0000000..aae5053
--- /dev/null
+++ b/2025.04.18/01Ex/solve.c
@@ -0,0 +1,43 @@
+#include "solve.h"
+
+#include <float.h>
+#include <math.h>
+
+// the Lagrange interpolation polynomial
+double t1_solve (const double x_0, const int n, const double * restrict X, const double * restrict Y)
+{
+	double value = 0;
+
+	for (int i = 0; i < n; ++i)
+	{
+		double x_i = X[i];
+		double y_i = Y[i];
+		
+		double numerator = y_i;
+		double denominator = 1;
+
+		if (fabs(x_0 - x_i) < DBL_EPSILON)
+			return y_i;
+
+		for (int j = 0; j < i; ++j)
+		{
+			double x_j = X[j];
+			numerator *= (x_0 - x_j);
+			denominator *= (x_i - x_j);
+		}
+
+		for (int j = i+1; j < n; ++j)
+		{
+			double x_j = X[j];
+			numerator *= (x_0 - x_j);
+			denominator *= (x_i - x_j);
+		}
+
+		if (fabs(denominator) < DBL_EPSILON)
+			return DBL_MAX;
+		
+		value += numerator / denominator;
+	}
+
+	return value;
+}
diff --git a/2025.04.18/01Ex/solve.h b/2025.04.18/01Ex/solve.h
new file mode 100644
index 0000000..8d9d4e7
--- /dev/null
+++ b/2025.04.18/01Ex/solve.h
@@ -0,0 +1,6 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+double t1_solve (const double x_0, const int n, const double * restrict X, const double * restrict Y);
+
+#endif
diff --git a/2025.04.18/tests/linear.txt b/2025.04.18/tests/linear.txt
new file mode 100644
index 0000000..967bc99
--- /dev/null
+++ b/2025.04.18/tests/linear.txt
@@ -0,0 +1,8 @@
+1 1
+2 2
+3 3
+4 4
+5 5
+6 6
+7 7
+8 8
diff --git a/2025.04.18/tests/linear_d.txt b/2025.04.18/tests/linear_d.txt
new file mode 100644
index 0000000..190ee2e
--- /dev/null
+++ b/2025.04.18/tests/linear_d.txt
@@ -0,0 +1,9 @@
+1 1 1
+2 2 1
+3 3 1
+4 4 1
+5 5 1
+6 6 1
+7 7 1
+8 8 1
+
diff --git a/2025.04.18/tests/log2_x.txt b/2025.04.18/tests/log2_x.txt
new file mode 100644
index 0000000..990e40a
--- /dev/null
+++ b/2025.04.18/tests/log2_x.txt
@@ -0,0 +1,16 @@
+1		0
+2		1
+4		2
+8		3
+16		4
+32		5
+64		6
+128		7
+256		8
+512		9
+1024		10
+2048		11
+4096		12
+8192		13
+16384		14
+32768		15