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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define vll vector<long long>
  5. #define MAXK 1000000
  6. #define mapll map<long long,long long>
  7. ll n;
  8. map<ll,ll> ma;
  9. int main(){
  10.     ios::sync_with_stdio(false);
  11.     cin.tie(nullptr);
  12.     cout.tie(nullptr);
  13.     freopen("bailam.inp","r",stdin);
  14.     freopen("bailam.out","w",stdout);
  15.     cin>>n;
  16.     if(n>=0){
  17.         ll mo=12345678*2;
  18.         ll ans=(n%mo)*((n-1)%mo);
  19.         ans=ans%mo;
  20.         cout<<ans/2;
  21.         return 0;
  22.     }
  23.     ll ans=0;
  24.     for(ll i=1;i<=n;i++){
  25.         ll x;
  26.         cin>>x;
  27.         ans+=ma[x];
  28.         ma[x]++;
  29.     }
  30.     cout<<ans;
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0.01s 5324KB
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https://ideone.com/cpYsar
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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