1000分，拿走

#include<bits/stdc++.h>
using namespace std;
const int N=1e5+10;
const int INF=0x3f3f3f3f;
#define LL long long
#define ull unsigned long long
int n,m,a[N],ub[114514];
'int main(){
	int anser[594088],sum;
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	for(int i=1;i<=m;i++){
		cin>>ub[i];
		int l=1,r=n;
		sum=0;	
	while(l<=r){
		int mid=(l+r)/2;
		if(a[mid]==ub[i])'{
			sum=mid;
			r=mid-1;
		}
		else if(a[mid]>ub[i]){
			r=mid-1;
		}
		else{
			l=mid+1;
		}
	}
		if(sum){
			anser[i]=sum;
		}
		else{
			anser[i]=-1;
		}
	}
	for(int i=1;i<=m;i++){
		cout<<anser[i]<<endl;
	}	
	return 1;
}                            '   

#include<bits/stdc++.h>
using namespace std;
const int N=1e5+10;
const int INF=0x3f3f3f3f;
#define LL long long
#define ull unsigned long long
int n,m,a[N],ub[114514];
int main(){
	int ans[594088],sum;
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	for(int i=1;i<=m;i++){
		cin>>ub[i];
		int l=1,r=n;
		sum=0;	
	while(l<=r){
		int mid=(l+r)/2;
		if(a[mid]==ub[i]){
			sum=mid;
			r=mid-1;
		}
		else if(a[mid]>ub[i]){
			r=mid-1;
		}
		else{
			l=mid+1;
		}
	}
		if(sum){
			ans[i]=sum;
		}
		else{
			ans[i]=-1;
		}
	}
	for(int i=1;i<=m;i++){
		cout<<ans[i]<<endl;
	}	
	return 0;
}
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阿妈特拉斯