[73] 矩阵置零

/**
 * @param {number[][]} matrix
 * @return {void} Do not return anything, modify matrix in-place instead.
 */
const setZeroes = function (matrix) {
  const yLen = matrix.length;
  const xLen = matrix[0].length;
  for (let i = 0; i < yLen; i++) {
    let left = 0;
    let right = 0;
    for (; right < xLen; right++) {
      if (matrix[i][right] === 0 || matrix[i][right] === '0') {
        if (matrix[i][right] === 0) {
          for (let k = 0; k < i; k++) {
            matrix[k][right] = null;
          }
          for (let k = i + 1; k < yLen; k++) {
            if (matrix[k][right] === 0) {
              matrix[k][right] = '0';
            } else {
              matrix[k][right] = null;
            }
          }
        }
        for (let j = left; j < right; j++) {
          matrix[i][j] = null;
        }
        for (; right < xLen - 1; right++) {
          if (matrix[i][right + 1] === 0) {
            break;
          }
          matrix[i][right + 1] = null;
        }
        left = right;
      }
    }
  }
  for (let i = 0; i < yLen; i++) {
    for (let j = 0; j < xLen; j++) {
      matrix[i][j] = Number(matrix[i][j]);
    }
  }
  return matrix;

};