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1426_Phone_List.cpp
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1426_Phone_List.cpp
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// Problem#: 1426
// Submission#: 1841435
// The source code is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
// URI: http://creativecommons.org/licenses/by-nc-sa/3.0/
// All Copyright reserved by Informatic Lab of Sun Yat-sen University
#include <iostream>
#include <cstring>
using namespace std;
struct trie{
int ch[100100][10];
int val[100100];
int size;
trie(){
size = 1;
memset(ch[0],0,sizeof(ch[0]));
memset(val,0,sizeof(val));
}
void intial(){
size = 1;
memset(ch[0],0,sizeof(ch[0]));
memset(val,0,sizeof(val));
}
bool insert(string tmp){
int t = 0;
for(int i = 0;i < tmp.size();i ++){
int cur = tmp[i] - '0';
if(!ch[t][cur]){
ch[t][cur] = size;
memset(ch[size],0,sizeof(ch[size]));
size ++;
}
t = ch[t][cur];
if(val[t] == 1)return false;
}
val[t]= 1;
for(int i = 0;i < 10;i ++){
if(ch[t][i] > 0)return false;
}
return true;
}
}a;
int main(){
int T;
cin >> T;
while(T --){
int n;
cin >> n;
bool flag = true;
a.intial();
for(int i = 0;i < n;i ++){
string tmp;
cin >> tmp;
if(flag){
flag = a.insert(tmp);
}
}
if(flag)cout << "YES" << endl;
else cout << "NO" << endl;
}
}