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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4.  
  5. int cnt[23];
  6. map<ll,ll> mp;
  7.  
  8. int main() {
  9.     int n; cin >> n;
  10.     ll a[n], ans=0;
  11.     for(int i=0; i<n; i++) {
  12.         cin >> a[i];
  13.         cnt[a[i]%23]++;
  14.     }
  15.  
  16.     for(int j=0; j<n; j++){
  17.         if(j > 5){
  18.             mp[a[j-6]%23]++;
  19.         }
  20.         ans += mp[a[j]%23];
  21.     }
  22.     cout << ans;
  23. }
Success #stdin #stdout 0s 5280KB
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https://ideone.com/w9Ypyb
language:
C++ (gcc 8.3)
created:
240 days ago
visibility:
public

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