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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n; cin>> n;
  6.     int f = 0;
  7.     int mp[5] = {};
  8.     for(int i=0;i<n;i++) {
  9.         int t;
  10.         cin>> t;
  11.         t %= 5;
  12.         f += mp[(5-t)%5];
  13.         mp[t]++;
  14.     }
  15.     cout << f;
  16. }
Success #stdin #stdout 0s 5316KB
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stdin
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6
2 2 5 5 3 3
stdout
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5
https://ideone.com/T7S5mn
6
language:
C++14 (gcc 8.3)
created:
8 hours ago
visibility:
public

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