Submission #514947

#	Time	Username	Problem	Language	Result	Execution time	Memory
514947		rainboy	초대 (JOI12_invitation)	C11	100 / 100	206 ms	20392 KiB

invitation

#include <stdio.h>
#include <string.h>

#define M	100000
#define N_	(M * 4)
#define M_	(M + N_)

unsigned int X = 12345;

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

int xx[N_], xx_[N_], ii[M_], jj[M_], ww[M_];

int compare_x(int h1, int h2) {
	return xx[h1] != xx[h2] ? xx[h1] - xx[h2] : (h1 & 1) - (h2 & 1);
}

int compare_w(int h1, int h2) {
	return ww[h2] - ww[h1];
}

int (*compare)(int, int);

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

		while (j < k) {
			int c = compare(hh[j], h);

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

int ds[N_];

int find(int i) {
	return ds[i] < 0 ? i : (ds[i] = find(ds[i]));
}

int join(int i, int j) {
	i = find(i);
	j = find(j);
	if (i == j)
		return 0;
	if (ds[i] > ds[j])
		ds[i] = j;
	else {
		if (ds[i] == ds[j])
			ds[i]--;
		ds[j] = i;
	}
	return 1;
}

int pq[M * 2], iq[1 + M * 2], cnt;

int lt(int i, int j) { return ww[i >> 1] > ww[j >> 1]; }

int p2(int p) {
	return (p *= 2) > cnt ? 0 : (p < cnt && 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);
}

void pq_remove(int i) {
	int j = iq[cnt--];

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

int pq_first() {
	return iq[1];
}

int main() {
	static int hh[M_], ww_[N_];
	int n, n1, n2, n_, m, m_, h, h_, i, c;
	long long w;

	scanf("%d%d%*d%d", &n1, &n2, &m), n = n1 + n2;
	for (h = 0; h < m; h++) {
		scanf("%d%d%d%d%d", &xx[h << 2 | 0], &xx[h << 2 | 1], &xx[h << 2 | 2], &xx[h << 2 | 3], &ww[h]);
		xx[h << 2 | 0]--, xx[h << 2 | 1]--, xx[h << 2 | 2]--, xx[h << 2 | 3]--;
		xx[h << 2 | 2] += n1, xx[h << 2 | 3] += n1;
	}
	for (h = 0; h < m * 4; h++)
		hh[h] = h;
	compare = compare_x, sort(hh, 0, m * 4);
	n_ = 0;
	for (h = 0; h < m * 4; h++) {
		int x;

		h_ = hh[h], x = xx[h_];
		if ((h_ & 1) == 0)
			pq_add(h_ >> 1);
		else
			pq_remove(h_ >> 1);
		xx[h_] = n_;
		if (h + 1 == m * 4 || xx[hh[h + 1]] != x)
			ww_[n_] = cnt ? ww[pq_first() >> 1] : 0, xx_[n_] = x, n_++;
	}
	for (h = 0; h < m; h++)
		ii[h] = xx[h << 2 | 0], jj[h] = xx[h << 2 | 2];
	w = 0, c = n, m_ = m;
	for (i = 0; i + 1 < n_; i++)
		if (ww_[i]) {
			w += (long long) (xx_[i + 1] - xx_[i] - 1) * ww_[i];
			c -= xx_[i + 1] - xx_[i] - 1;
			ii[m_] = i, jj[m_] = i + 1, ww[m_] = ww_[i], m_++;
		}
	memset(ds, -1, n_ * sizeof *ds);
	for (h = 0; h < m_; h++)
		hh[h] = h;
	compare = compare_w, sort(hh, 0, m_);
	for (h = 0; h < m_; h++) {
		h_ = hh[h];
		if (join(ii[h_], jj[h_]))
			w += ww[h_], c--;
	}
	if (c != 1)
		w = -1;
	printf("%lld\n", w);
	return 0;
}

Compilation message (stderr)

invitation.c: In function 'main':
invitation.c:114:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  114 |  scanf("%d%d%*d%d", &n1, &n2, &m), n = n1 + n2;
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
invitation.c:116:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  116 |   scanf("%d%d%d%d%d", &xx[h << 2 | 0], &xx[h << 2 | 1], &xx[h << 2 | 2], &xx[h << 2 | 3], &ww[h]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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