48. Rotate Image

https://leetcode.com/problems/rotate-image/

JavaScript

/**
 * @param {number[][]} matrix
 * @return {void} Do not return anything, modify matrix in-place instead.
 */
var rotate = function(matrix) {
  var n = matrix.length

  for (let i = 0; i < n; i++) {
    for (let j = 0; j < n - i - 1; j++) {
      let temp = matrix[i][j]
      matrix[i][j] = matrix[n - j - 1][n - i - 1]
      matrix[n - j - 1][n - i - 1] = temp
    }
  }

  for (let i = 0; i < n / 2 >> 0; i++) {
    let temp = matrix[i]
    matrix[i] = matrix[n - i - 1]
    matrix[n - i - 1] = temp
  }
}

Python

class Solution(object):

    def rotate(self, matrix):
        """
        :type matrix: List[List[int]]
        :rtype: void Do not return anything, modify matrix in-place instead.
        """
        n = len(matrix)

        for i in range(n):
            for j in range(n - i - 1):
                matrix[i][j], matrix[n - j - 1][n - i - 1] = matrix[n - j - 1][n - i - 1], matrix[i][j]

        for i in range(n // 2):
            matrix[i], matrix[n - i - 1] = matrix[n - i - 1], matrix[i]