Submission #124714

#	Time	Username	Problem	Language	Result	Execution time	Memory
124714		Noam527	Exhibition (JOI19_ho_t2)	C++17	100 / 100	293 ms	5416 KiB

joi2019_ho_t2

#include <bits/stdc++.h>
#define finish(x) return cout << x << endl, 0
typedef long long ll;
typedef long double ldb;
const int md = 1e9 + 7;
const ll inf = 1e18;
const int OO = 1;
const int OOO = 1;
using namespace std;

int n, m;
vector<pair<int, int>> a;
vector<int> b;

bool can(int x) {
	priority_queue<int, vector<int>, greater<int>> Q;
	int lst = -1, nxt = 0;
	for (int i = m - x; i < m; i++) {
		while (nxt < a.size() && a[nxt].first <= b[i]) {
			if (a[nxt].second >= lst) Q.push(a[nxt].second);
			nxt++;
		}
		if (!Q.size()) return false;
		lst = Q.top();
		Q.pop();
	}
	return true;
}

int main() {
	ios::sync_with_stdio(0), cin.tie(0);
	cin >> n >> m;
	a.resize(n);
	for (auto &i : a) cin >> i.first >> i.second;
	sort(a.begin(), a.end());
	b.resize(m);
	for (auto &i : b) cin >> i;
	sort(b.begin(), b.end());
	int lo = 0, hi = min(n, m), mid;
	while (lo < hi) {
		mid = (lo + hi + 1) / 2;
		if (can(mid)) lo = mid;
		else hi = mid - 1;
	}
	finish(lo);
}

Compilation message (stderr)

joi2019_ho_t2.cpp: In function 'bool can(int)':
joi2019_ho_t2.cpp:19:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while (nxt < a.size() && a[nxt].first <= b[i]) {
          ~~~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 50 / 50