1 #include <iostream> 2 #include <algorithm> 3 #include <vector> 4 5 using namespace std; 6 7 int main() 8 { 9 int n; 10 while(cin >> n) 11 { 12 if(n==1) 13 { 14 cout << "Yes" << endl; 15 continue; 16 } 17 vector<int> v(26,0); 18 while(n --) 19 { 20 char tmp_color; 21 cin >> tmp_color; 22 v[tmp_color-'a'] ++; 23 } 24 int multi_color_num = 0; 25 int single_color_num = 0; 26 for(int i = 0;i < 26;i ++) 27 { 28 if(v[i]==1) 29 single_color_num ++; 30 else if(v[i]>=2) 31 multi_color_num ++; 32 } 33 if(multi_color_num) 34 cout << "Yes" << endl; 35 else 36 cout << "No" << endl; 37 } 38 return 0; 39 }