867. Transpose Matrix

JIAKAOBO

LeetCode

感谢赞助!

• ㊗️
• 大家
• offer
• 多多！

Problem

Given a 2D integer array matrix, return the transpose of matrix.

The transpose of a matrix is the matrix flipped over its main diagonal, switching the matrix’s row and column indices.

Example 1:

Input: matrix = [[1,2,3],[4,5,6],[7,8,9]]
Output: [[1,4,7],[2,5,8],[3,6,9]]

Example 2:

Input: matrix = [[1,2,3],[4,5,6]]
Output: [[1,4],[2,5],[3,6]]

Code

class Solution {
    public int[][] transpose(int[][] matrix) {
        int row = matrix.length;
        int col = matrix[0].length;
        int[][] res = new int[col][row];

        for (int i = 0; i < row; i++) {
            for (int j = 0; j < col; j++) {
                res[j][i] = matrix[i][j];
            }
        }

        return res;
    }
}