c++很简单

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

int main(){
    int N, headV;
    while(cin >> N >> headV){
        vector<int> arr;
        arr.push_back(headV);
        for(int i=0;i<N-1;i++){
            int back, front;
            cin >> back >> front;
            vector<int>::iterator it = find(arr.begin(),arr.end(), front);
            if(it!=arr.end()){
                arr.insert(it+1, back); 
            }else{
                arr.push_back(back);
            }
        }
        int remove;
        cin >> remove;
        arr.erase(find(arr.begin(),arr.end(), remove));
        for(auto i: arr){
            cout << i << " ";
        }
        cout << endl;
    } 
    return 0;
}