样例过，测全WA，求调教

#include<bits/stdc++.h>
using namespace std;
int a[100005],s,d,f,g;
int ef(int x){
	int l=0,r=s+1;
	while(l+1<r){
		int mid=(l+r)/2;
		if(a[mid]<x) l=mid;
		else r=mid;
	}
	if(a[r]==x)
	return r;
	else return -1;
}
int main(){
	a[0]=-1e9;
	scanf("%d",&s);
	scanf("%d",&d);
	for(int i=1;i<=s;i++){
		scanf("%d",&a[i]);
	}
	a[s+1]=1e9;
	
	for(int i=0;i<d;i++){
		scanf("%d",&f);
		printf("%d ",ef(f));
	}
	
	
	return 0;
}