Change the dir structure slightly

src/builtin_structures/rotate_NxN.py

@@ -1,30 +0,0 @@
-#!/usr/bin/env python
-
-__author__ = "bt3"
-
-def rotate_NxN(m):
-    n = len(m)
-    for layer in range(n//2):
-        first = layer
-        last = n - 1 - layer
-        for i in range(first, last):
-            offset = i - first
-            top = m[first][i]
-            m[first][i] = m[last-offset][first]
-            m[last-offset][first] = m[last][last-offset]
-            m[last][last-offset] = m[i][last]
-            m[i][last] = top
-    return m
-
-
-
-def main():
-    m = [[1,2],[3,4]]
-    mr = [[3,1],[4,2]]
-    assert(rotate_NxN(m) == mr)
-    m2 = [[1,2,3],[4,5,6],[7,8,9]]
-    print(rotate_NxN(m2))
-
-if __name__ == '__main__':
-    main()
-