Bình luận

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  0

  

  Cython10  đã bình luận 2:23:52 ch, 19/11/2024

  hay ;-;

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  -1

  

  khanh  đã bình luận 1:48:54 ch, 19/11/2024

  include <iostream>

  include <string>

  using namespace std;

  long long countCOWOccurrences(const string& s) { long long countC = 0, countCO = 0, countCOW = 0;

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  for (char  ch : s) {
      if (ch == 'C') {
          countC++;
      } else if (ch == 'O') {
          countCO += countC; 
      } else if (ch == 'W') {
          countCOW += countCO; 
      }
  }
  
  return countCOW;
  

  }

  int main() { long long n; string s;

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  cin >> n; 
  cin >> s; 
  
  cout << countCOWOccurrences(s) << endl; 
  
  return 0;
  

  }