Help me in solving NUMBERS problem

help
,
1

My issue

Can anyone check my code why it is partially submitting
Let me know why some test cases are not passing

My code

#include <bits/stdc++.h>
using namespace std;

int main() {
	//Your code goes here
	int t;
	cin>>t;
while(t--)
{
    	unordered_map<int,int>mp;
    	int N;
    	cin>>N;
    	vector<pair<string,int>>res;
    	for(int i=0;i<N;i++)
    	{
    	    string a;
    	    int b;
    	    cin>>a>>b;
    	    res.push_back({a,b});
    	   mp[b]++;
    	}
    	vector<pair<int,string>>ans;
    	for(int i=0;i<N;i++)
    	{
    	    if(mp[res[i].second]==1)
    	    {
    	        ans.push_back({res[i].second,res[i].first});
    	    }
    	}
    	sort(ans.begin(),ans.end());
         
         if(ans.size()==0)
         {
             cout<<"Nobody wins"<<endl;
         }
         else
         {
             cout<<ans[0].second<<endl;
         }

}
	
	return 0;
}

Problem Link: NUMBERS Problem - CodeChef

2

@mohdkaif123
There should be a . after Nobody wins

3

Thanks a lot to notiify me!!