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2019-03-31-transpose matrix

admin 11月 12, 2020 0

题目，867. Transpose Matrix

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

解析

var transpose = function(A) {
    let copy = new Array(A[0].length);
    for (var i = 0; i < A[0].length; i++) {
      copy[i] = new Array(A.length);
    }  
    for (let i = 0; i < A.length; ++i) {  
        for (let j = 0; j < A[i].length; ++j) {
            copy[j][i] = A[i][j];
        }
    }
  return copy
};