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  1. #include <iostream>
  2. #include <unordered_map>
  3. using namespace std;
  4.  
  5. int demGiaoDiem(string s) {
  6.     unordered_map<char, int> viTri;
  7.     int giaoDiem = 0;
  8.     for (int i = 0; i < 52; i++) {
  9.         if (viTri.count(s[i])) {
  10.             for (auto &[c, j] : viTri)
  11.                 if (j < viTri[s[i]] && i > j) giaoDiem++;
  12.         }
  13.         viTri[s[i]] = i;
  14.     }
  15.     return giaoDiem;
  16. }
  17.  
  18. int main() {
  19.     string s;
  20.     cin >> s;
  21.     cout << demGiaoDiem(s);
  22. }
  23.  
Success #stdin #stdout 0.01s 5276KB
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398
https://ideone.com/lwQxVn
language:
C++ (gcc 8.3)
created:
10 days ago
visibility:
public

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