Answered: +)Do code). """ You are given an n x…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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+)Do code).

"""
You are given an n x n 2D mat representing an image.

Rotate the image by 90 degrees (clockwise).

Follow up:
Could you do this in-place?
"""

# clockwise rotate
# first reverse up to down, then swap the symmetry
# 1 2 3 7 8 9 7 4 1
# 4 5 6 => 4 5 6 => 8 5 2
# 7 8 9 1 2 3 9 6 3

def rotate(mat):
if not mat:
return mat
mat.reverse()
for i in range(len(mat)):
for j in range(i):
mat[i][j], mat[j][i] = mat[j][i], mat[i][j]
return mat

if __name__ == "__main__":
mat = [[1, 2, 3],
[4, 5, 6],
[7, 8, 9]].

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