不懂就问

#include<bits/stdc++.h>
using namespace std;
int box[1005];
int main(){
	string s;
	cin>>s;
	for(int i=0;i<s.size();i++){
		if(s[i]<='z'&&s[i]>='a')box[s[i]]++;
	}
	cout<<max(max(box['b'],box['o']),box['y'])<<"\n";
	cout<<max(max(box['g'],box['r']),max(box['i'],box['l']));
	return 0;
}

我极其的不理解