wa两个点QAQ

#include<bits/stdc++.h>
using namespace std;
#define int long long
int n,m;
int a[100005],b[100005];
signed main(){
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	for(int i=1;i<=m;i++){
		cin>>b[i];
	}
	sort(b+1,b+1+m);
	for(int i=1;i<=n;i++){
		int l=1,r=m;
		while(l<r){
			int mid=l+r>>1;
			if(b[mid]==a[i]){
				cout<<a[i]<<" ";
				break;
			}
			if(a[i]>b[mid]){
				l=mid+1;
			}
			else{
				r=mid;
			}
		}
	}
	return 0;
}

调好必关~