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[leetcode]轉置矩陣

867. 轉置矩陣

給定一個矩陣 A, 返回 A 的轉置矩陣。

矩陣的轉置是指將矩陣的主對角線翻轉,交換矩陣的行索引與列索引。

示例 1:

輸入:[[1,2,3],[4,5,6],[7,8,9]]
輸出:[[1,4,7],[2,5,8],[3,6,9]]

示例 2:

輸入:[[1,2,3],[4,5,6]]
輸出:[[1,4],[2,5],[3,6]]

提示:

  1. 1 <= A.length <= 1000
  2. 1 <= A[0].length <= 1000

C++解法:

class Solution {
public
: vector<vector<int>> transpose(vector<vector<int>>& A) { int rowNum = A.size(); int column = A[0].size(); if (rowNum == column) { for (int i = 0; i < rowNum; ++i) { for (int j = i; j < column;
++j) { swap(A[i][j], A[j][i]); } } return A; } else { vector<vector<int>> ans(column); for (int i = 0; i < column; ++i) { for (int j =
0; j < rowNum; ++j) { ans[i].push_back(A[j][i]); } } return ans; } } };