HDU - 1251 统计难题

https://vjudge.net/problem/HDU-1251

#include<iostream>
#include<algorithm>
#include<unordered_map>
#include<cstring> 
using namespace std;
int main()
{
	char a[15],b[15];
	unordered_map<string,int> q;
	while(cin.getline(a,11) && strlen(a)!=0)
	{
		for(int i=strlen(a);i>=1;i--)
		{
			a[i]='\0';
			q[a]++;
		}
	}
	while(cin.getline(a,11))
		cout<<q[a]<<"\n";
	return 0;
}