Why None of the test case passes?

#1

Not one of the test case pass. It’s something wrong with the code or I am doing this with vector that’s why it is wrong.

#2

declare a new
vector v;
for each test case
move this statement inside while(t–)

#3

Still not passing anyone of the test cases.

#4 
#include<iostream>
#include<bits/stdc++.h>
#include<vector>
using namespace std;

bool Compare(string a, string b){
	string ab = a.append(b);
	string ba = b.append(a);

	return ab.compare(ba) > 0 ? true : false;
}

int main() {

	int t;
	cin>>t;
	while(t--){
		int size;
		cin>>size;
			vector<string> v;
		for(int i=0;i<size;i++){
			string d;
			cin>>d;
			v.push_back(d);
		}
		sort(v.begin(),v.end(),Compare);
		for(int i=0;i<size;i++){
			cout<<v[i];
		}
		cout<<endl;
	}
	return 0;
}
#5

code worked fine for me

#6

Yeah, there is a problem with editor First it doesn’t work but after multiple refreshes it worked.
Thanx!

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