func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 110000;   char a[N];   int chk[N];   int main() {     ios_base::sync_with_stdio(0);     int n;     cin >> n;     cin >> a;     if (n == 1) {       cout <<  Yes  << endl;       return 0;     }     for (int i = 0; i < n; i++) chk[a[i]]++;     bool flg = 1;     for (int i = 0; i < 256; i++) {       if (chk[i] != 1 && chk[i] != 0) flg = 0;     }     if (flg)       cout <<  No  << endl;     else       cout <<  Yes  << endl;     return 0;   }   