#1351 - Count Negative Numbers in a Sorted Matrix

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Problem Description

Given a m x n matrix grid which is sorted in non-increasing order both row-wise and column-wise, return the number of negative numbers in grid.

Solution

/**
 * @param {number[][]} grid
 * @return {number}
 */
var countNegatives = function(grid) {
  return grid.reduce((count, row) => {
    while (row.pop() < 0) {
      count++;
    }
    return count;
  }, 0);
};