题目描述

blablabla

样例

#include<iostream>
using namespace std;

const int N = 100010;
int q[N];

int main()
{
    int n,m;
    scanf("%d%d",&n,&m);

    for(int i = 0; i < n; i ++) scanf("%d",&q[i]);

    while (m -- )
    {
        int x;
        scanf("%d",&x);
        int l = 0, r = n - 1;

        while(l < r)
        {
            int mid = l + r >> 1;
            if(q[mid] >= x) r = mid;
            else l = mid + 1;
        }

        if(q[l] != x) cout << "-1 -1" << endl;
        else
        {
            cout << l << " ";
            l = 0, r = n - 1;

            while(l < r)
            {
                int mid = l + r + 1 >> 1;
                if(q[mid] <= x) l = mid;
                else r = mid - 1;
            }

            cout << l << " " <<endl;
        }

    }

    return 0;
}