题解

#include<iostream>
#include<algorithm>
using namespace std;

int main(){
    int t;
    cin>>t;
    while(t--){
        int h;
        string s,copyed;
        cin>>h;
        while(h--){
            string s1;
            cin>>s1;
            s+=s1;
        }
        for (char i:s) copyed+=i;
        sort(s.begin(),s.end());
        cout<<(s==copyed)<<endl;
    }
    return 0;
}