```cpp
#include<iostream>
using namespace std;
int a[1000005],n,m;
int find(int x){
int l=1,r=n,ans=-1;
while(l<=r){
int mid=(l+r)/2;
if(x==a[mid]){
ans=mid;
}
if(a[mid]<x){
l=mid+1;
}else{
r=mid-1;
}
}
return ans;
}
int main(){
cin>>n>>m;
for(int i=1;i<=n;i++){
cin>>a[i];
}
for(int i=1;i<=m;i++){
int x;
cin>>x;
cout<<find(x)<<" ";
}
return 0;
}
```
by 20121028LRR @ 2024-04-07 18:25:59
```cpp
#include<iostream>
using namespace std;
int a[1000005],n,m;
int find(int x){
int l=0,r=n+1;
while(l+1<r){
int mid=(l+r)/2;
if(a[mid]>=x){
r=mid;
}else{
l=mid;
}
}
if(a[r]==x){
return r;
}else{
return -1;
}
}
int main(){
cin>>n>>m;
for(int i=1;i<=n;i++){
cin>>a[i];
}
a[0]=-1e9;
a[n+1]=1e9;
for(int i=1;i<=m;i++){
int x;
cin>>x;
cout<<find(x)<<" ";
}
return 0;
}
```
by 20121028LRR @ 2024-04-07 18:36:02
@[20121028LRR](/user/1003179) 谢谢，已关
by jasonlixuran @ 2024-04-07 19:11:17