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  1. // Online C++ compiler to run C++ program online
  2. #include <iostream>
  3. #include <bits/stdc++.h>
  4.  
  5. #define ll long long
  6. #define endll '\n'
  7. #define FOR for(int i = 1; i <= n; i++)
  8. using namespace std;
  9. void fastIO()
  10. {
  11.     ios_base::sync_with_stdio(false);
  12.     cin.tie(NULL);
  13.     cout.tie(NULL);
  14. }
  15. ll a[1001][1001];
  16. int main() {
  17.     fastIO();
  18.     int n , m; cin >> n >> m;
  19.     for(int i = 1; i <= n; ++i)
  20.     {
  21.         for(int j = 1; j <= m ; ++j)
  22.         {
  23.             cin >> a[i][j];
  24.         }
  25.     }
  26.  
  27.  
  28.     for(int i = 1; i <= n; ++i)
  29.     {
  30.         for(int j = 1; j <= m ; ++j)
  31.             a[i][j] += a[i][j - 1];
  32.     }
  33.  
  34.     for(int i = 1; i <= m; ++i)
  35.     {
  36.         for(int j = 1; j <= n ; ++j)
  37.             a[j][i] += a[j - 1][i];
  38.     }
  39.  
  40.  
  41.     int x,y; cin >> x >> y;
  42.  
  43.     ll mx = LLONG_MIN;
  44.     for (int down = x; down <= n; ++down )
  45.     {
  46.         for(int right = y; right <= m; ++right)
  47.         {
  48.             int left = right - y + 1;
  49.             int up = down - x + 1;
  50.             mx = max(mx, a[down][right] - a[up-1][right] - a[down][left-1] + a[up - 1][left - 1]);
  51.         }
  52.     }
  53.     cout << mx << endll;
  54.     return 0;
  55. }
Success #stdin #stdout 0.01s 5308KB
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-9223372036854775808
https://ideone.com/4uf75r
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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