矩阵置零

输入: 
[
  [1,1,1],
  [1,0,1],
  [1,1,1]
]
输出: 
[
  [1,0,1],
  [0,0,0],
  [1,0,1]
]

输入: 
[
  [0,1,2,0],
  [3,4,5,2],
  [1,3,1,5]
]
输出: 
[
  [0,0,0,0],
  [0,4,5,0],
  [0,3,1,0]
]

/**
 * @param {number[][]} matrix
 * @return {void} Do not return anything, modify matrix in-place instead.
 */
var setZeroes = function(matrix) {
    var row = new Set();
    var column = new Set();
    matrix.forEach( (line, i) => {
        line.forEach( (v, k) => {
            if(v === 0) {
                row.add(i);
                column.add(k);
            }
        })
    } )
    matrix.forEach( (line, i) => {
        line.forEach( (v, k) => {
            if( row.has(i) || column.has(k) ) matrix[i][k] = 0;
        })
    } )
};

https://github.com/WindrunnerMax/EveryDay

https://leetcode-cn.com/problems/set-matrix-zeroes/