Determine the Photo Position

Determine the Photo Position

link ：https://ac.nowcoder.com/acm/contest/11166/D
source ： Cattle from

Input :
5 3
00000
01110
01110
01110
00000
222
Output
6

Input
3 2
101
010
101
22
Output
0

Input
3 1
101
010
101
2
Output
4

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <math.h>
#include <string.h>
using namespace std;
 char c[2001][2001];
int main()
{
    
    int n,m;
    cin>>n>>m;
    int ans=0;
    int sum=0;
 for(int i=1;i<=n;i++)
    {
    
        sum=0;
        for(int j=1;j<=n;j++)
        {
    
            cin>>c[i][j];
            if(c[i][j]=='0')
                sum++;
            else
                sum=0;
            if(sum>=m)
                ans++;
        }
        // cout<<ans;
    }
    cin>>m;
    cout<<ans<<endl;
    return 0;
}