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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define int long long
  5. #define nn "\n"
  6.  
  7. const long long INF = 4e18;
  8. const int N = 1505;
  9.  
  10. int n;
  11. int a[N];
  12. long long dp[N][N];
  13.  
  14. signed main() {
  15.     ios::sync_with_stdio(0);
  16.     cin.tie(0);
  17.  
  18.     cin >> n;
  19.     for(int i = 1; i <= n - 1; i++){
  20.         cin >> a[i];
  21.     }
  22.  
  23.     for(int i = 0; i <= n; i++){
  24.         for(int j = 0; j <= n; j++){
  25.             dp[i][j] = INF;
  26.         }
  27.     }
  28.  
  29.     dp[0][1] = 0;
  30.  
  31.     long long ans = INF;
  32.  
  33.     for(int i = 0; i <= n - 1; i++){
  34.         for(int j = 1; j <= n; j++){
  35.             if(dp[i][j] == INF) continue;
  36.  
  37.             if(i + j >= n){
  38.                 ans = min(ans, dp[i][j]);
  39.             }
  40.  
  41.             for(int k = i + 1; k <= min((long long)n - 1, i + j); k++){
  42.  
  43.                 // vào sưởi
  44.                 dp[k][j] = min(dp[k][j], dp[i][j] + 1);
  45.  
  46.                 // mua áo
  47.                 dp[k][j + 1] = min(dp[k][j + 1],
  48.                                    dp[i][j] + a[k]);
  49.             }
  50.         }
  51.     }
  52.  
  53.     cout << ans << nn;
  54.     return 0;
  55. }
Success #stdin #stdout 0.01s 5300KB
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https://ideone.com/VrDmzP
language:
C++14 (gcc 8.3)
created:
5 hours ago
visibility:
public

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