func_code_string: #include <bits/stdc++.h>   using namespace std;   string s;   int n;   int a[26];   int b[26];   bool flag[26];   bool cmp(int x, int y) { return a[x] < a[y]; }   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     cin >> s >> n;     memset(a, 0, sizeof(a));     memset(flag, 1, sizeof(flag));     for (int i = 0; i < s.size(); ++i) {       a[s[i] -  a ]++;     }     for (int i = 0; i < 26; ++i) {       b[i] = i;     }     int ans = 26;     sort(b, b + 26, cmp);     for (int i = 0; i < 26; ++i) {       if (a[b[i]] <= n) {         flag[b[i]] = 0;         n -= a[b[i]];         ans--;       }     }     cout << ans <<   n ;     for (int i = 0; i < s.size(); ++i) {       if (flag[s[i] -  a ]) cout << s[i];     }     return 0;   }   