AcWing 789. 数的范围
原题链接
简单
作者:
a_little
,
2024-04-10 17:47:10
,
所有人可见
,
阅读 1
#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
const int N = 100010;
int a[N];
int main()
{
int n,m;
cin>>n>>m;
for(int i=0;i<n;i++) cin>>a[i];
while (m -- ){
int l=0,r=n-1;
int x;
cin>>x;
while(l<r){
int mid=l+r>>1;
if(a[mid]>=x){
r=mid;
}
else l=mid+1;
}
if(a[l]==x){
cout<<l<<' ';
r=n-1;
while(l<r){
int mid=l+r+1>>1;
if(a[mid]<=x){
l=mid;
}
else r=mid-1;
}
cout<<l<<endl;
}
else {
cout<<-1<<' '<<-1<<endl;
}
}
return 0;
}