题解

# include<iostream>
using namespace std;
struct node{
    int data;
    node *next;
};
int main(){
    int n,m,t,s=0,y;
    node *head,*r,*p;
    cin>>n>>m;
    head=new node;
    head->next=NULL;
    r=head;
    for(int i=0;i<n;++i){
        cin>>t;
        p=new node;
        p->data=t;
        p->next=NULL;
        r->next=p;
        r=p;
    }
    for(int i=0;i<m;++i){
        cin>>t;
        p=head;
        while(p->next->data!=t) p=p->next;
        p->next=p->next->next;
    }
    cin>>y;
    p=head;
    while(p->next->data!=y){
        ++s;
        p=p->next;
    }
    cout<<s+1;
    return 0;
}