A - Doggo Recoloring-思维

#include<bits/stdc++.h>
using namespace std;
int len,a[30];
string str;
int main()
{
    cin>>len>>str;
    for(int i=0; i<len; i++)
        a[str[i]-'a']++;
    if(len==1||a[max_element(a,a+30)-a]>=2)
        cout<<"Yes"<<endl;
    else
        cout<<"No"<<endl;
    return 0;
}