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- include<bits/stdc++.h>
- using namespace std;
- int G(int x){
- return 0;
- }
- int main(){
- ios_base::sync_with_stdio(false);
- cin.tie(NULL);
- int t,n,k,sum,min,j;
- string ans_str;
- int A[26], B[26]={};
- cin>>t;
- while(t--){
- cin>>n;
- string a[n];
- min=27;
- for(k=0;k<n;k++){
- cin>>a[k];
- string s;
- s=a[k];
- transform(A,A+26,A,G);
- for(int i=0;i<s.size();i++){
- A[int(s[i])-97]=1;
- }
- sum=accumulate(A, A+26,0);
- // cout<<sum<<'\n';
- if(sum<=min){
- min=sum;
- j=k;
- ans_str=a[k];
- }
- //cout<<A[0]<<'\n';
- }
- cout<<ans_str<<'\n';
- }
- return 0;
- }
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