Package g1301_1400.s1351_count_negative_numbers_in_a_sorted_matrix

Class Solution

java.lang.Object
g1301_1400.s1351_count_negative_numbers_in_a_sorted_matrix.Solution
public class Solution extends Object
1351 - Count Negative Numbers in a Sorted Matrix.

Easy

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

Follow up: Could you find an O(n + m) solution?

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • countNegatives

      public int countNegatives(int[][] grid)