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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std; 
  4.  
  5. typedef long long ll; 
  6. typedef pair<int, int> ii; 
  7.  
  8. const ll LINF = 1e18; 
  9. const int INF = 1e9;
  10.  
  11. int n; 
  12. int h[20], s[20]; 
  13. int w[20][20]; 
  14. ll best; 
  15.  
  16. void backtrack(int i) {
  17. 	if (i == n) {
  18. 		ll ans = 0; 
  19. 		for (int j = 0; j < n; j++) {
  20. 			ans += h[j] * s[j]; 
  21. 			for (int k = j + 1; k < n; k++) {
  22. 				ans += w[j][k] * s[j] * s[k]; 
  23. 			}
  24. 		}
  25. 		best = min(best, ans); 
  26. 		return;
  27. 	}
  28.  
  29. 	s[i] = 1;   
  30. 	backtrack(i + 1); 
  31.  
  32. 	s[i] = -1; 
  33. 	backtrack(i + 1); 
  34. }
  35.  
  36. int main() {
  37. 	ios::sync_with_stdio(false); 
  38. 	cin.tie(nullptr); 
  39. 	cin >> n; 
  40.  
  41. 	for (int i = 0; i < n; i++) cin >> h[i]; 
  42.  
  43. 	for (int i = 0; i < n; i++) {
  44. 		for (int j = i + 1; j < n; j++) cin >> w[i][j]; 
  45. 	}
  46.  
  47. 	best = LINF; 
  48. 	backtrack(0);
  49.  
  50. 	cout << best << '\n';
  51. }
  52.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/p6f7a6
language:
C++14 (gcc 8.3)
created:
72 days ago
visibility:
secret

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