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  1. #include <bits/stdc++.h>
  2. #define VuDucNam ios_base::sync_with_stdio(false);
  3. #define Lop9a6 cin.tie(NULL);
  4. #define THCSPhamVanDong cout.tie(NULL);
  5. #define ll long long
  6. #define el cout << '\n'
  7. #define sz(a) (ll) a.size()
  8. #define all(a) a.begin(), a.end()
  9. #define fi first
  10. #define se second
  11. #define fill(a, x) memset(a, x, sizeof(a))
  12. #define file(name)                        \
  13.     if (fopen(name ".inp", "r"))          \
  14.         freopen(name ".inp", "r", stdin); \
  15.         freopen(name ".out", "w", stdout);
  16. #define TIME (1.0 * clock() / CLOCKS_PER_SEC)
  17. #define RUNTIME cerr << "\nRuntime: " << TIME << "s.\n"
  18.  
  19. using namespace std;
  20.  
  21. const ll MOD = 1e9 + 7;
  22. const ll inf = LLONG_MAX;
  23.  
  24. int n,a[25005],dp[25005][6];
  25.  
  26. void solve()
  27. {
  28.     cin >> n;
  29.     for(int i=1;i<n;++i)
  30.         cin >> a[i];
  31.     dp[1][0]=a[1];
  32.     dp[1][1]=a[1];
  33.     for(int i=2;i<n-1;++i){
  34.         dp[i][0]=dp[i-1][1];
  35.         dp[i][1]=min(dp[i-1][0],dp[i-1][1]) + a[i];
  36.     }
  37.     int ans=min(dp[n-2][0],dp[n-2][1]) + a[n-2];
  38.     cout << ans;
  39.     el;
  40. }
  41.  
  42. int main()
  43. {
  44.     VuDucNam Lop9a6 THCSPhamVanDong
  45.     // file();
  46.     solve();
  47.     return 0;
  48. }
  49.  
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/oWlnqV
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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