func_code_string: #include <bits/stdc++.h>   using namespace std;   string s;   map<char, int> u;   int main() {     cin >> s >> s;     for (auto x : s) ++u[x];     if (u.size() == 1) return puts( Yes ), 0;     for (auto& x : u)       if (x.second >= 2) return puts( Yes ), 0;     puts( No );   }   