func_code_string: #include <bits/stdc++.h>   using namespace std;   map<char, int> freq;   vector<int> vec;   vector<char> vec2;   int main() {     int n, k;     cin >> n >> k;     string s, ans, update, alpha =  abcdefghijklmnopqrstuvwxyz ;     cin >> s;     int size = s.size();     for (int i = 0; i < 26; i++) {       for (int j = 0; j < size; j++) {         if (k > 0) {           if (s[j] == alpha[i]) {             k--;             s[j] =  0 ;           }         }       }     }     for (int i = 0; i < size; i++) {       if (s[i] !=  0 ) {         ans += s[i];       }     }     cout << ans << endl;     return 0;   }   