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867. 转置矩阵

题目描述

给你一个二维整数数组 matrix， 返回 matrix 的 转置矩阵 。

矩阵的 转置 是指将矩阵的主对角线翻转，交换矩阵的行索引与列索引。

 

示例 1：

输入：matrix = [[1,2,3],[4,5,6],[7,8,9]]
输出：[[1,4,7],[2,5,8],[3,6,9]]

示例 2：

输入：matrix = [[1,2,3],[4,5,6]]
输出：[[1,4],[2,5],[3,6]]

 

提示：

  • m == matrix.length
  • n == matrix[i].length
  • 1 <= m, n <= 1000
  • 1 <= m * n <= 105
  • -109 <= matrix[i][j] <= 109

解法

方法一

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class Solution:
    def transpose(self, matrix: List[List[int]]) -> List[List[int]]:
        return list(zip(*matrix))

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class Solution {
    public int[][] transpose(int[][] matrix) {
        int m = matrix.length, n = matrix[0].length;
        int[][] ans = new int[n][m];
        for (int i = 0; i < n; ++i) {
            for (int j = 0; j < m; ++j) {
                ans[i][j] = matrix[j][i];
            }
        }
        return ans;
    }
}

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class Solution {
public:
    vector<vector<int>> transpose(vector<vector<int>>& matrix) {
        int m = matrix.size(), n = matrix[0].size();
        vector<vector<int>> ans(n, vector<int>(m));
        for (int i = 0; i < n; ++i)
            for (int j = 0; j < m; ++j)
                ans[i][j] = matrix[j][i];
        return ans;
    }
};

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func transpose(matrix [][]int) [][]int {
    m, n := len(matrix), len(matrix[0])
    ans := make([][]int, n)
    for i := range ans {
        ans[i] = make([]int, m)
        for j := range ans[i] {
            ans[i][j] = matrix[j][i]
        }
    }
    return ans
}

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/**
 * @param {number[][]} matrix
 * @return {number[][]}
 */
var transpose = function (matrix) {
    const m = matrix.length;
    const n = matrix[0].length;
    const ans = new Array(n).fill(0).map(() => new Array(m).fill(0));
    for (let i = 0; i < n; ++i) {
        for (let j = 0; j < m; ++j) {
            ans[i][j] = matrix[j][i];
        }
    }
    return ans;
};

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