https://www.luogu.com.cn/paste/gxbmxx7v 题目

#include<bits/stdc++.h>
using namespace std;
const int N = 1e5 + 5;
#define int long long
int a,n,m,b[N];
int Stk[N],top;
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(0),cout.tie(0);
	cin >> n >> m;
	for(int i = 1;i <= n;i++){
		cin >> a;
		Stk[top++] = a;
	}
	for(int i = 1;i <= m;i++){
		cin >> b[i];
	}
	for(int i = top;i >= 0;i--){
		for(int j = 1;j <= m;j++){
			if(Stk[i] == b[j]){
				cout << Stk[i] << " ";
				break;
			}
		}
	}
	return 0;
}

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