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  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. int main() {
  7.     ios_base::sync_with_stdio(false);
  8.     cin.tie(NULL);
  9.  
  10.     int N;
  11.     if (!(cin >> N)) return 0;
  12.  
  13.     string S;
  14.     cin >> S;
  15.  
  16.     long long countO = 0;
  17.     long long countOS = 0;
  18.     long long ans = 0;
  19.  
  20.     for (char c : S) {
  21.         if (c == 'O') {
  22.             countO++;
  23.         } else if (c == 'S') {
  24.             countOS += countO;
  25.         } else if (c == 'N') {
  26.             ans += countOS;
  27.         }
  28.     }
  29.  
  30.     cout << ans << "\n";
  31.  
  32.     return 0;
  33. }
Success #stdin #stdout 0.01s 5312KB
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stdin
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8
SONOSONO
stdout
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2
https://ideone.com/Zob3HE
language:
C++ (gcc 8.3)
created:
23 hours ago
visibility:
public

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