Leetcode-Blind75/48.rotate-image.java at main · pranav2579/Leetcode-Blind75 · GitHub

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/*
 * @lc app=leetcode id=48 lang=java
 *
 * [48] Rotate Image
 */

// @lc code=start
class Solution {
    public void rotate(int[][] matrix) {
        transpose(matrix);
        reflect(matrix);
    }

    public void transpose(int[][] matrix) {
        int n = matrix.length;
        for (int i = 0; i < n; i++) {
            for (int j = i + 1; j < n; j++) {
                int tmp = matrix[j][i];
                matrix[j][i] = matrix[i][j];
                matrix[i][j] = tmp;
            }
        }
    }

    public void reflect(int[][] matrix) {
        int n = matrix.length;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n / 2; j++) {
                int tmp = matrix[i][j];
                matrix[i][j] = matrix[i][n - j - 1];
                matrix[i][n - j - 1] = tmp;
            }
        }
    }
}
// @lc code=end