이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
vector<vector<int> > dir(26,vector<int> (26));
vector<int> visiting(26);
vector<int> visited(26);
vector<int> ord;
bool good=true;
void dfs(int ind){
if(visiting[ind]){
good=false;
return;
}
visiting[ind]=true;
for(int i = 0 ; i < 26 ; i ++){
if(!dir[ind][i]||visited[i])continue;
dfs(i);
if(!good)return;
}
ord.push_back(ind);
visited[ind]=true;
}
int main(){
int n;
cin>>n;
vector<string> a(n),b(n);
for(int i = 0 ; i < n ; i ++)cin>>a[i];
for(int j = 0 , x ; j < n ; j ++){
cin>>x;x--;
b[j]=a[x];
}
for(int i = 0 ; i < n ; i ++){
for(int j = i+1 ; j < n ; j ++){
int ns=min(b[i].size(),b[j].size());
if(b[i].substr(0,ns)==b[j].substr(0,ns)){
if(b[i].size()<b[j].size())
continue;
else{
cout<<"NE";
return 0;
}
}
for(int k = 0 ; k < ns ; k ++){
if(b[i][k]==b[j][k])continue;
dir[b[i][k]-'a'][b[j][k]-'a']=true;
break;
}
}
}
for(int i = 0 ; i < 26 ; i ++){
if(visited[i])continue;
dfs(i);
if(!good){
cout<<"NE";
return 0;
}
}
vector<char> rez(26);
for(int i = 25 ; i >= 0 ; i --){
rez[ord[i]]=char('a'+25-i);
}
cout<<"DA"<<endl;
for(int i = 0 ; i < 26 ; i ++)
cout<<rez[i];
}
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