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matrix

867. Transpose Matrix​

tip
  • 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.

Locale Dropdown

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]]
class Solution {
    public int[][] transpose(int[][] matrix) {
        int rows = matrix.length; // 行数
        int cols = matrix[0].length; // 列数
        // 所谓转置举证，就是行变列，列边行
        int[][] result = new int[cols][rows];
        // 行列的值互换
        for(int i = 0; i < rows; i++) {
            for(int j = 0; j < cols; j++) {
                result[j][i] = matrix[i][j];
            }
        }
        return result;
    }
}