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Problem

Submissions

Total Negative Numbers In A Sorted Matrix

Contributed by

Abhinav Jain

Easy

0/40

10 upvotes

Problem Statement

You are given an ‘N’ x ‘M’ matrix ‘MAT’, which is sorted in non-increasing order both row-wise and column-wise. Your task is to count the number of negative numbers in ‘MAT’.

For Example:

You are given ‘N’ = 3, ‘M’ = 2 and ‘MAT’= [[3, 1],[2, -1],[1, 2]]. Then the answer will be two for the first test case because there are two negative numbers in the given matrix(-1, -2).

Detailed explanation ( Input/output format, Notes, Constraints, Images )

Input Format :

The first line of the input contains a single integer 'T', representing the number of test cases.

The first line of each test case contains two space-separated integers, ‘N’ and ‘M’, representing the number of rows and columns in ‘MAT’, respectively.

The next ‘N’ lines contain ‘M’ space-separated integers representing the elements of ‘MAT’.

Output Format:

For each test case, print the number of negative numbers in ‘MAT’.

Print the output of each test case in a separate line.

Note:

You do not need to print anything. It has already been taken care of. Just implement the given function.

Constraints:

1 <= T <= 10
1 <= N <= 5000
1 <= M <= 5000
-10^6 <= MAT[i][j] <= 10^6

Time Limit: 1 sec

Sample Input 1:

Sample Output 1:

2
5

Explanation of Sample Input 1:

For the first test case, the answer will be two for the first test case because there are two negative numbers in the given matrix(-1, -2).

For the second test case, the answer will be five because there are five negative numbers in the given matrix(-1, -2, -3, -4, -5).

Sample Input 2:

Sample Output 2:

2
0

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