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  1. #include <bits/stdc++.h>
  2. #define mod 1000000000
  3. #define f first
  4. #define s second
  5. #define ll long long
  6. using namespace std;
  7. const int NMAX=1e5+7;
  8. int a[NMAX],n;
  9. bool visited[NMAX];
  10. vector <int> b;
  11. void subs2() {
  12.     cout<<(ll) a[1]*n-((ll)(n/4))*a[1];
  13. }
  14. int main() {
  15.     //ttai20082101
  16.     //freopen("promote.inp","r",stdin);
  17.     //freopen("promote.out","w",stdout);
  18.     ios_base::sync_with_stdio(0);
  19.     cin.tie(0);cout.tie(0);
  20.     cin>>n;
  21.     bool sub2=true;
  22.     for (int i=1;i<=n;i++) {
  23.         cin>>a[i];
  24.         if (a[i]!=a[i-1]&&i>1) sub2=false;
  25.     }
  26.     if (sub2==true) {
  27.         subs2();
  28.         return 0;
  29.     }
  30.     long long ans=0;
  31.     sort(a+1,a+n+1);
  32.     memset(visited,false,sizeof(visited));
  33.     for (int i=1;i<=n;i++) if (visited[i]==false) {
  34.         ans+=a[i]+a[n-3*i+3]+a[n-1-3*i+3];
  35.         visited[i]=true;
  36.         visited[n-3*i+3]=true;
  37.         visited[n-3*i+3-1]=true;
  38.         visited[n-3*i+3-2]=true;
  39.     }
  40.     for (int i=1;i<=n;i++) if (visited[i]==false) ans+=a[i];
  41.     cout<<ans;
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 0s 5288KB
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https://ideone.com/7zNcDK
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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