Submission #544784

#	Time	Username	Problem	Language	Result	Execution time	Memory
544784		rainboy	Hotel (CEOI11_hot)	C11	100 / 100	646 ms	37220 KiB

hot

#include <stdio.h>

#define N	500000
#define M	500000

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

int *xx, *yy;

void sort(int *ii, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, i_ = ii[l + rand_() % (r - l)], tmp;

		while (j < k) {
			int c = xx[ii[j]] != xx[i_] ? xx[ii[j]] - xx[i_] : yy[ii[j]] - yy[i_];

			if (c == 0)
				j++;
			else if (c < 0) {
				tmp = ii[i], ii[i] = ii[j], ii[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = ii[j], ii[j] = ii[k], ii[k] = tmp;
			}
		}
		sort(ii, l, i);
		l = k;
	}
}

int dd[M], iq[1 + M], pq[M], cnt;

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

int p2(int p) {
	return (p *= 2) > cnt ? 0 : (lt(iq[p + 1], iq[p]) ? p + 1 : p);
}

void pq_up(int i) {
	int p, q, j;

	for (p = pq[i]; (q = p / 2) && lt(i, j = iq[q]); p = q)
		iq[pq[j] = p] = j;
	iq[pq[i] = p] = i;
}

void pq_dn(int i) {
	int p, q, j;

	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(int i) {
	pq[i] = ++cnt, pq_up(i);
}

int pq_remove_first() {
	int i = iq[1], j = iq[cnt--];

	if (j != i)
		pq[j] = 1, pq_dn(j);
	pq[i] = 0;
	return i;
}

int main() {
	static int aa[N], bb[N], cc[M], ee[N], hh[N], ii[N], jj[M];
	int n, m, k_, k, h, i, j;
	long long ans;

	scanf("%d%d%d", &n, &m, &k);
	for (i = 0; i < n; i++) {
		scanf("%d%d", &bb[i], &aa[i]);
		ii[i] = i;
	}
	xx = aa, yy = bb, sort(ii, 0, n);
	for (j = 0; j < m; j++) {
		scanf("%d%d", &dd[j], &cc[j]);
		jj[j] = j;
	}
	xx = cc, yy = dd, sort(jj, 0, m);
	k_ = 0;
	for (i = 0, j = 0; i < n; i++) {
		while (j < m && cc[jj[j]] <= aa[ii[i]])
			pq_add(jj[j++]);
		if (cnt)
			ee[k_++] = dd[pq_remove_first()] - bb[ii[i]];
	}
	for (h = 0; h < k_; h++)
		hh[h] = h;
	xx = ee, yy = ee, sort(hh, 0, k_);
	ans = 0;
	for (h = k_ - 1; h >= 0 && ee[hh[h]] > 0 && h >= k_ - k; h--)
		ans += ee[hh[h]];
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

hot.c: In function 'main':
hot.c:80:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |  scanf("%d%d%d", &n, &m, &k);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
hot.c:82:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |   scanf("%d%d", &bb[i], &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hot.c:87:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |   scanf("%d%d", &dd[j], &cc[j]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10