请问我这个为什么会运行错误？

#include<iostream>

#include<string>

#include<map>

#include<algorithm>

using namespace std;

bool comp(int i,int j)

{

return i>j;

}

int main()

{

string ss;

map<int,string> mapper;

int a[100],count=0;

cin>>ss;

mapper[ss.length()]=ss;

a[count++]=ss.length();

char c;

while((c=cin.get())!='\n')

{

cin>>ss;

mapper[ss.length()]=ss;

a[count++]=ss.length();

}

sort(a,a+count,comp);

cout<<mapper[a[0]]<<endl;

return 0;

}