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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int N = 1e3+5;
  5. int a[N][N], pre_h[N][N], pre_c[N][N], ans = 0;
  6.  
  7.  
  8. int main(){
  9.     int m, n, k;cin >> m >> n >> k;
  10.     // << pre_h[1][0];
  11.     for(int i = 1; i <= m;i++){
  12.         for(int j = 1; j <= n; j++){
  13.             cin >> a[i][j];
  14.             pre_h[i][j] = pre_h[i][j-1] + a[i][j];
  15.             //cout << pre_h[i][j] << " ";
  16.             pre_c[i][j] = pre_c[i-1][j] + a[i][j];
  17.         }
  18.         //cout << endl;
  19.     }
  20.     for(int i = 1; i <= m;i++){
  21.         for(int j = k; j <= n;j++){
  22.             if ((pre_h[i][j] - pre_h[i][j-k])%k==0) ans++;
  23.         }
  24.     }
  25.     for(int j = 1; j <= n;j++){
  26.         for(int i = k; i <= m;i++){
  27.             if ((pre_c[i][j] - pre_c[i-k][j])%k==0) ans++;
  28.         }
  29.     }
  30.     cout << ans;
  31. }
  32.  
Success #stdin #stdout 0.01s 5616KB
comments (?)
stdin
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3 4 3
1 2 3 4
2 4 6 8
3 5 7 1
stdout
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6
https://ideone.com/ExwvD8
language:
C++14 (gcc 8.3)
created:
6 hours ago
visibility:
public

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