C++ 代码

#include<iostream>
using namespace std;
const int N = 1e5 + 10;
int main()
{
    int n,k;
    int q[N];
    cin >> n >> k;
    for(int i = 0; i < n; i ++ ) cin >> q[i];

    while(k -- )
    {
        int t;
        cin >> t;
        int l = 0, r =  n- 1;
        while(l < r)
        {
            int mid = (l+r) >> 1;
            if(q[mid] >= t)  r = mid;
            else l = mid + 1;
        }
        if(q[l] != t)
        {
            cout<<"-1 -1"<<endl;
            continue;
        }
        cout<<l<<" ";

        l = 0, r = n - 1;
        while(l < r)
        {
            int mid = (l + r + 1) >> 1;
            if(q[mid] <= t) l = mid;
            else r = mid - 1;
        }
        cout<<l<<endl;
    }

    return 0;
}