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 | #include<bits/stdc++.h> // 万能头文件 
 using namespace std;
 
 int f[50100];
 map <string, int> Num;
 string Names[50100];
 map <string, bool> Used;
 
 int Find(int x){
 if(f[x] == x) return x;
 int next = Find(f[x]);
 f[x] = next;
 return next;
 }
 
 void Link(int Fa, int Son){
 f[Son] = f[Find(Fa)];
 }
 
 int main(){
 string Name;
 string Fa;
 char Type = 'A';
 int Cur = 0;
 int Fanum;
 while(Type != '$'){
 Type = getchar();
 switch(Type){
 case '#':{
 cin >> Fa;
 if(!Used[Fa]){
 Used[Fa] = true;
 Num[Fa] = ++Cur;
 Names[Cur] = Fa;
 }
 if(f[Num[Fa]] == 0)
 f[Cur] = Cur;
 Fanum = f[Num[Fa]];
 break;
 }
 case '+':{
 cin >> Name;
 if(!Used[Name]){
 Used[Name] = true;
 Num[Name] = ++Cur;
 Names[Cur] = Name;
 }
 if(f[Num[Name]] == 0)
 f[Num[Name]] = Cur;
 Link(Fanum, Num[Name]);
 break;
 }
 case '?':{
 cin >> Name;
 cout << Name << " " << Names[Find(Num[Name])]<< endl;
 break;
 }
 default:break;
 }
 }
 return 0;
 }
 
 |