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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4.  
  5. int main(){
  6.     vector<ll> O, S, N;
  7.     ll n, ans = 0; cin >> n;
  8.  
  9.     for (ll i = 0; i < n; ++i){
  10.         char huruf; 
  11.         cin >> huruf;
  12.         if (huruf == 'O') O.push_back(i);
  13.         else if (huruf == 'S') S.push_back(i);
  14.         else N.push_back(i);
  15.     }
  16.  
  17.     ll bn = N.size();
  18.     for (ll s : S){
  19.         ll p = upper_bound(O.begin(), O.end(), s) - O.begin();
  20.         ll q = lower_bound(N.begin(), N.end(), s) - N.begin();
  21.         ans += p * (bn - q);
  22.     }
  23.     cout << ans;
  24. }
  25.  
Success #stdin #stdout 0.01s 5296KB
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https://ideone.com/1qinlr
language:
C++ (gcc 8.3)
created:
15 days ago
visibility:
public

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