leetcode-48 旋转图像

/**
 * @param {number[][]} matrix
 * @return {void} Do not return anything, modify matrix in-place instead.
 */
var rotate = function (matrix) {
  // n x n规格
  const n = matrix.length;
  // 翻转
  for (let row = 0; row < n; row++) {
    for (let col = row + 1; col < n; col++) {
      let temp = matrix[row][col];
      matrix[row][col] = matrix[col][row];
      matrix[col][row] = temp;
    }
  }
  // 翻转
  for (let row = 0; row < n; row++) {
    matrix[row].reverse();
  }
  return matrix;
};
// rotate([
//  [1, 2, 3],
//  [4, 5, 6],
//  [7, 8, 9],
// ]);