백준 14170 Counting Haybales (USACO December 2016 Silver 1번)

문제 링크: https://www.acmicpc.net/problem/14170

14170번: Counting Haybales

#include <bits/stdc++.h>
using namespace std;
 
int n, q, a[100001];
 
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
 
    cin >> n >> q;
    for(int i = 0; i < n; i++) cin >> a[i];
    sort(a, a + n);
 
    while(q--) {
        int s, e;
        cin >> s >> e;
        cout << upper_bound(a, a + n, e) - lower_bound(a, a + n, s) << '\n';
    }
    return 0;
}