Submission #1274344

#	Time	Username	Problem	Language	Result	Execution time	Memory
1274344		kaiboy	Exhibition (JOI19_ho_t2)	C++20	0 / 100	1 ms	568 KiB

joi2019_ho_t2

#include <algorithm>
#include <iostream>

using namespace std;

const int   N = 100000;
const int   M = 100000;
const int INF = 0x3f3f3f3f;

int aa[N], bb[N], iia[N], iib[N], cc[M];
int pq[N], iq[N + 1], pq_cnt;

bool lt(int i, int j) {
	return bb[i] > bb[j];
}

int p2(int p) {
	return (p <<= 1) > pq_cnt ? 0 : p ^ (p < pq_cnt && lt(iq[p + 1], iq[p]));
}

void pq_up(int i) {
	int j, p, q;
	for (p = pq[i]; (q = p >> 1) && lt(i, j = iq[q]); p = q)
		iq[pq[j] = p] = j;
	iq[pq[i] = p] = i;
}

void pq_dn(int i) {
	int j, p, q;
	for (p = pq[i]; (q = p2(p)) && lt(j = iq[q], i); p = q)
		iq[pq[j] = p] = j;
	iq[pq[i] = p] = i;
}

void pq_add_last(int i) {
	iq[pq[i] = ++pq_cnt] = i;
}

void pq_remove(int i) {
	if (pq[i]) {
		int j = iq[pq_cnt--];
		if (i != j)
			pq[j] = pq[i], pq_up(j), pq_dn(j);
		pq[i] = 0;
	}
}

int pq_remove_first() {
	int i = iq[1], j = iq[pq_cnt--];
	if (i != j)
		pq[j] = 1, pq_dn(j);
	pq[i] = 0;
	return i;
}

int main() {
	ios_base::sync_with_stdio(false), cin.tie(NULL);
	int n, m; cin >> n >> m;
	for (int i = 0; i < n; i++)
		cin >> aa[i] >> bb[i], iia[i] = iib[i] = i;
	for (int j = 0; j < m; j++)
		cin >> cc[j];
	sort(iia, iia + n, [] (int i, int j) { return aa[i] > aa[j]; });
	sort(iib, iib + n, [] (int i, int j) { return bb[i] > bb[j]; });
	sort(cc, cc + m, greater<>());
	for (int i = 0; i < n; i++)
		pq_add_last(i);
	for (int p = pq_cnt >> 1; p; p--)
		pq_dn(p);
	for (int ha = 0, hb = 0, b = INF, j = 0; j < m; j++) {
		int c = cc[j];
		for (int i; ha < n && aa[i = iia[ha]] > c; ha++)
			pq_remove(i);
		for (int i; hb < n && bb[i = iib[hb]] > b; hb++)
			pq_remove(i);
		if (!pq_cnt) {
			cout << j << '\n';
			return 0;
		}
		b = bb[pq_remove_first()];
	}
	cout << m << '\n';
	return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 50