Rotate n*n matrix inplace

rotatenbyn_inplace.py

@@ -0,0 +1,43 @@
+'''
+Question Statement
+Rotate a n*n matrix by 90 degrees without using extra space
+
+'''
+N = 4
+
+def rotateMatrix(matrix): 
+
+    for i in range(0, int(N/2)): 
+
+        for j in range(i, N-i-1): 
+
+            tmp = matrix[i][j] 
+
+            matrix[i][j] = matrix[j][N-1-i] 
+
+            matrix[j][N-1-i] = matrix[N-1-i][N-1-j] 
+
+            matrix[N-1-i][N-1-j] = matrix[N-1-j][i] 
+
+            matrix[N-1-j][i] = tmp 
+
+
+def displayMatrix( matrix ): 
+
+    for i in range(0, N): 
+
+        for j in range(0, N): 
+
+            print (matrix[i][j]) 
+        print ("")
+
+
+
+matrix = [[0 for i in range(N)] for j in range(N)] 
+matrix = [ [0, 1, 2, 3 ], 
+        [00, 11, 22, 33 ], 
+        [44, 55, 66, 77 ], 
+        [88, 99, 110, 120 ] ] 
+rotateMatrix(matrix) 
+
+displayMatrix(matrix)