1351. Count Negative Numbers in a Sorted Matrix

QUESTION:

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.

Example 1:

Input: grid = [[4,3,2,-1],[3,2,1,-1],[1,1,-1,-2],[-1,-1,-2,-3]]
Output: 8
Explanation: There are 8 negatives number in the matrix.

Example 2:

Input: grid = [[3,2],[1,0]]
Output: 0

Constraints:

m == grid.length
n == grid[i].length
1 <= m, n <= 100
-100 <= grid[i][j] <= 100

EXPLANATION:

easy的题目，for循环嵌套遍历就可以

SOLUTION:

class Solution {
    func countNegatives(_ grid: [[Int]]) -> Int {
        var result:Int = 0
        for gri in grid {
            for gr in gri {
                if gr < 0 {
                    result += 1
                }
            }
        }
        return result
    }
}
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