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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int n,a[100001],k, dp[100001];
  4. void nhap()
  5. {
  6.     cin >> n;
  7.     for(int i = 1; i <= n; i++) cin >> a[i];
  8.     cin >> k;
  9. }
  10. void solve()
  11. {
  12.     dp[0] = 0, dp[1] = a[1];
  13.     if(k == 1)
  14.     {
  15.         dp[2] = max(a[1], a[2]);
  16.         for(int i = 3; i <= n; i++)
  17.         {
  18.             dp[i] = max(dp[i-2] + a[i], dp[i-1]);
  19.         }
  20.         if(dp[n] < 0) cout <<0;
  21.         else cout << dp[n];
  22.     }
  23.     else
  24.     {
  25.         dp[2] = max(a[2], dp[1] + a[2]);
  26.         for(int i = 3; i <= n; i++)
  27.         {
  28.             dp[i] = max(a[i] + a[i-1] + dp[i-3], max(dp[i-2] + a[i], dp[i-1]));
  29.         }
  30.         if(dp[n] < 0) cout<< 0;
  31.         else cout << dp[n];
  32.     }
  33. }
  34. int main()
  35. {
  36.     ios_base::sync_with_stdio(0);
  37.     cin.tie(0); cout.tie(0);
  38.     nhap();
  39.     solve();
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/UhEGTa
language:
C++14 (clang 8.0)
created:
74 days ago
visibility:
secret

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