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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define int long long
  4. void sol(){
  5.     int n;
  6.     cin >> n;
  7.     int a[n], ans = 0;
  8.     map<int, int> m;
  9.     for(int &i:a) cin >> i, m[i]++;
  10.     for(int i = 1; i < 1000001; i++) ans += m[i * i] * m[i * i * i];
  11.     cout << ans << '\n';
  12.     return;
  13. }
  14. signed main(){
  15.     ios_base::sync_with_stdio(false);
  16.     cin.tie(NULL);
  17.     cout.tie(NULL);
  18.     int t = 1;
  19.     //cin >> t;
  20.     while(t--){
  21.         sol();
  22.     }
  23.     return 0;
  24. }
Success #stdin #stdout 0.7s 128660KB
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https://ideone.com/VixZ6Q
language:
C++ (gcc 8.3)
created:
7 hours ago
visibility:
secret

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