题目传送门：

（https://www.luogu.com.cn/problem/P2249）

#include<bits/stdc++.h>
using namespace std;
const int  N=10100;int n,q;
int b[N];	
int c[100000001],a[100000001];
int main(){
	scanf("%ld",&n);
	for(int i=1;i<=n;i++){
		scanf("%ld",&a[i]);
	}
	scanf("%ld",&q);
	for(int i=1;i<=q;i++){
		scanf("%ld",&b[i]);  
	}
	int sum=1;
	int r=n,l=1,mid;
    while(l<=r){
	
	mid=(l+r)/2;		 
	if(a[mid]==b[sum]){
	r=mid-1;
	}
	if(a[mid]>b[sum]){
	r=mid-1;
	}
	if(a[mid]<b[sum]){
	l=mid+1;
	}
	if(a[l]==b[sum]){
	
	c[sum]=l;
	sum++;
	r=n,l=1;
	}
}
for(int i=1;i<=q;i++){
	if(c[i]!=0){
		printf("%d ",c[i]);
	}
	else{
	printf("%d ",-1);
	}
}
	return 0;
}