题解

#include<bits/stdc++.h>
using namespace std;
char s[101];
char b[26]{'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
int a[26];
int main(){
    cin>>s;
    int n = strlen(s);
    for(int j=0;j<n;j++){
        for(int i=0;i<26;i++)if(s[j]==b[i])a[i]++;
    }
    int x=a[0];
    char x1=127;
    for(int i=0;i<26;i++)if(a[i]>x)x=a[i];
    for(int i=0;i<26;i++)if(a[i]==x&&b[i]<x1)x1=b[i];
    cout<<x1;
    return 0;
}