leetcode-867-Transpose-Matrix

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描述

Given a matrix A, return the transpose of A.

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

Example 1:

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

Example 2:

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

Note:

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

分析

声明一个行数，列数跟原数组相反的数组，便利一遍原数组的同时对新数组进行赋值。

解决方案1(Java)

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class Solution {
    public int[][] transpose(int[][] A) {
        int height = A.length;
        int length = A[0].length;
        int[][] result = new int[length][height];
        for (int i = 0; i < A.length; i++) {
            for (int j = 0; j < A[0].length; j++) {
                result[j][i] = A[i][j];
            }
        }
        return result;
    }
}

题目来源