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# Wat was the error in the program to find rotating the matrix counter clockwise by 90 degree

https://code.sololearn.com/chEi13r8q91B/?ref=app

8th Oct 2020, 3:19 PM
Sindhuja Selvakumar
2 ответов
+ 1
N=4 def rotateMatrix(mat): for x in range(0, int(N / 2)): for y in range(x, N-x-1): temp = mat[x][y] mat[x][y] = mat[y][N-1-x] mat[y][N-1-x] = mat[N-1-x][N-1-y] mat[N-1-x][N-1-y] = mat[N-1-y][x] mat[N-1-y][x] = temp def displayMatrix( mat ): for i in range(0, N): for j in range(0, N): print (mat[i][j], end = ' ') print ("") mat = [[0 for x in range(N)] for y in range(N)] mat = [ [1, 2, 3, 4 ],[5, 6, 7, 8 ],[9, 10, 11, 12 ],[13, 14, 15, 16 ] ] rotateMatrix(mat) # Print rotated matrix displayMatrix(mat) #In python white spaces are matters, counted as indentations..
8th Oct 2020, 3:33 PM
Jayakrishna 🇮🇳
+ 2
Works fine after removing invalid characters def rotateMatrix(mat): for x in range(0, int(N / 2)): for y in range(x, N-x-1): temp = mat[x][y] mat[x][y] = mat[y][N-1-x] mat[y][N-1-x] = mat[N-1-x][N-1-y] mat[N-1-x][N-1-y] = mat[N-1-y][x] mat[N-1-y][x] = temp def displayMatrix( mat ): for i in range(0, N): for j in range(0, N): print (mat[i][j], end = ' ') print ("") mat = [[0 for x in range(N)] for y in range(N)] mat = [ [1, 2, 3, 4 ], [5, 6, 7, 8 ], [9, 10, 11, 12 ], [13, 14, 15, 16 ]] ''' # Test case 2 mat = [ [1, 2, 3 ],         [4, 5, 6 ],         [7, 8, 9 ] ]    # Test case 3 mat = [ [1, 2 ],         [4, 5 ] ]            ''' rotateMatrix(mat) # Print rotated matrix displayMatrix(mat) When you copy paste some formatted text from other resources you usually end up with those invalid characters which you have to delete
8th Oct 2020, 3:25 PM
Abhay
Актуальное сегодня
Python