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  1. #include <bits/stdc++.h> 
  2. using namespace std;  
  3.  
  4. typedef long long ll;  
  5. typedef pair<int, int> ii;  
  6.  
  7. const int INF = 1e9;  
  8. const ll LINF = 1e18;  
  9.  
  10. const int N = 1e3 + 5; 
  11.  
  12. int n, k;  
  13. int a[N][N];  
  14. ll sum[N][N];
  15.  
  16. ll getSum(int x1, int y1, int x2, int y2) {
  17. 	return sum[x2][y2] - sum[x1 - 1][y2] - sum[x2][y1 - 1] + sum[x1 - 1][y1 - 1];
  18. }
  19.  
  20. int main() {
  21. 	ios::sync_with_stdio(0); cin.tie(0);  	
  22. 	cin >> n >> k;  
  23.  
  24. 	for (int i = 1; i <= n; i++) {
  25. 		for (int j = 1; j <= n; j++) cin >> a[i][j]; 
  26. 	} 
  27.  
  28. 	for (int x = 1; x <= n; x++) {
  29. 		for (int y = 1; y <= n; y++) {
  30. 			sum[x][y] = sum[x - 1][y] + sum[x][y - 1] - sum[x - 1][y - 1] + a[x][y]; 
  31. 		}
  32. 	}
  33.  
  34. 	ll ans = 0;  
  35. 	for (int x1 = 1; x1 + k - 1 <= n; x1++) {
  36. 		for (int y1 = 1; y1 + k - 1 <= n; y1++) {
  37. 			int x2 = x1 + k - 1, y2 = y1 + k - 1;   
  38. 			ans = max(ans, getSum(x1, y1, x2, y2)); 
  39. 		}
  40. 	}
  41.  
  42. 	cout << ans << '\n'; 
  43. }
  44.  
Success #stdin #stdout 0.01s 5640KB
comments (?)
stdin
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4 3
1 9 1 1
9 9 9 9
1 9 9 9
1 9 9 14
stdout
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86
https://ideone.com/63KEem
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
secret

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