fork download
copy 
  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. #define ll long long
  5. #define pb push_back
  6. #define fi first
  7. #define se second
  8. #define nn '\n'
  9. #define pi pair<ll,ll>
  10. #define unmp unordered_map
  11. #define uns unordered_set
  12. #define TASK ""
  13. ll mod = 1e9+7;
  14. const int N = 1e5 + 5;
  15. int MOD = 998244353;
  16. int bit[200000];
  17. int n;
  18. int dem = 0;
  19. unmp<int, int> cnt;
  20. int daoso(int n){
  21.     string t;
  22.     while(n > 0){
  23.         int d = n % 10;
  24.         string k = to_string(d);
  25.         t += k;
  26.         n /= 10;
  27.     }
  28.     int kq = stoi(t);
  29.     return kq;
  30. }
  31. int main() {
  32.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  33.     if(fopen(TASK".INP","r")){
  34.             freopen(TASK".INP","r",stdin);
  35.             freopen(TASK".OUT","w",stdout);
  36.     }
  37.     cin >> n;
  38.     for(int i = 1; i <=n ; i++){
  39.         int x; cin >> x;
  40.         int target = daoso(x);
  41.         dem += cnt[target];
  42.         cnt[x]++;
  43.     }
  44.     cout << dem << nn;
  45.     return 0;
  46. }
  47.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
copy 
6
123 123 456 321 654 789
stdout
copy 
3
https://ideone.com/3necgR
language:
C++14 (gcc 8.3)
created:
7 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!