样例输出的是555，真的很神奇，废话少说，请看代码 ->

#include<bits/stdc++.h>
using namespace std;
int a[1000005],m,n,q,ans = 0;
int f(int q){
	int l = 0,r = n,mid;
	while(l<r){
		mid = (l+r)/2;
		if(a[mid] = q) return mid;
		else if(a[mid] < q) l = mid+1;
		else r = mid-1;
	}
	return -1;
}
int main(){
	scanf("%d %d",&n,&m);
	for(int i = 0; i < n; i++){
		scanf("%d",&a[i]);
	}
	for(int i = 1; i <= m; i++){
		scanf("%d",&q);
		ans = f(q);
		cout << ans << " ";
	}
	return 0;
}