AcWing 789. 数的范围
原题链接
简单
作者:
羊妞
,
2025-04-15 11:17:31
· 江苏
,
所有人可见
,
阅读 4
#include<iostream>
using namespace std;
const int N = 1e5 + 10;
int n, q;
int a[N];
int main(){
scanf("%d%d", &n, &q);
for(int i = 0; i < n; i++) scanf("%d", &a[i]);
while(q--){
int x;
scanf("%d", &x);
int l = 0, r = n - 1;
int i, j;
while(l < r){
int mid = l + r >> 1;
if(a[mid] >= x) r = mid;
else l = mid + 1;
}
if(a[l] != x) cout << "-1 -1" << endl;
else{
i = l;
r = n - 1;
while(l < r){
int mid = l + r + 1 >> 1;
if(a[mid] <= x) l = mid;
else r = mid - 1;
}
j = r;
cout << i << " " << j << endl;
}
}
return 0;
}