update

tools/print_mat.py

@@ -0,0 +1,20 @@
+rows = 5
+cols = 4
+
+mat = [range(0 + (cols * i), cols + (cols * i), 1) for i in range(rows)]
+
+
+def print_mat(mat):
+    for s in mat:
+        print(*s)
+
+
+def rotate_mat(mat):
+    mat = [[mat[row][col] for row in range(rows - 1, -1, -1)] for col in range(cols)]
+    return mat
+
+
+print_mat(mat)
+mat = rotate_mat(mat)
+print("rotated:")
+print_mat(mat)