Submission #1216891

#	Time	Username	Problem	Language	Result	Execution time	Memory
1216891		stdfloat	Exhibition (JOI19_ho_t2)	C++20	In queue	0 ms	0 KiB

joi2019_ho_t2

#include <bits/stdc++.h>
using namespace std;

using ll = long long;

#define ff  first
#define ss  second
#define pii pair<int, int>

#define sz(v)	(int)(v).size()
#define all(v)	(v).begin(), (v).end()

int main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);

	int n, m;
	cin >> n >> m;

	pii p[n];
	for (int i = 0; i < n; i++)
		cin >> p[i].ff >> p[i].ss;

	sort(p, p + n);

	vector<int> C(m);
	for (auto &i : C)
		cin >> i;

	sort(all(C));

	int mx = 0;
	for (int mk = 0; mk < 1 << n; mk++) {
		bool tr = true;
		int c = -1, pre = -1, cnt = 0;
		for (int i = 0; i < n; i++) {
			if (!(mk >> i & 1)) {
				cnt++;

				if (pre > p[i].ss) {
					tr = false; break;
				}
				pre = p[i].ss;

				c = lower_bound(c + 1 + all(C), p[i].ff) - C.begin();
				if (c == m ) {
					tr = false; break;
				}
			}
		}

		if (tr) mx = max(mx, cnt);
	}

	cout << mx;
}