Submission #733394

#	Time	Username	Problem	Language	Result	Execution time	Memory
733394		rainboy	공주님의 정원 (KOI11_flower)	C11	0 / 18	21 ms	1104 KiB

flower

#include <stdio.h>

#define N	100000
#define H	17	/* H = ceil(log2(N)) */
#define MD	365

int min(int a, int b) { return a < b ? a : b; }

unsigned int X = 12345;

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

int dd[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

int idx(int m, int d) {
	int h;

	for (h = 0; h < m; h++)
		d += dd[h];
	return d;
}

int ll[N], rr[N];

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)
			if (ll[ii[j]] == ll[i_])
				j++;
			else if (ll[ii[j]] < ll[i_]) {
				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 contains(int l1, int r1, int l2, int r2) {
	if (l1 > r1)
		r1 += MD;
	if (l2 > r2)
		r2 += MD;
	if (l2 < l1)
		l2 += MD, r2 += MD;
	return l1 <= l2 && r2 <= r1;
}

int main() {
	static int ii[N], jj[H + 1][N], dd[H + 1][N];
	int n, n_, l_, r_, h, i, i_, j, k, k_, l, r, d;

	scanf("%d", &n), l_ = idx(2, 0), r_ = idx(10, 29);
	for (i = 0; i < n; i++) {
		int ml, dl, mr, dr;

		scanf("%d%d%d%d", &ml, &dl, &mr, &dr), ml--, dl--, mr--, dr--;
		ll[i] = idx(ml, dl), rr[i] = idx(mr, dr);
	}
	for (i = 0; i < n; i++)
		ii[i] = i;
	sort(ii, 0, n);
	n_ = 0;
	for (i = 0; i < n; i++)
		if (n_ == 0 || !contains(ll[ii[n_ - 1]], rr[ii[n_ - 1]], ll[ii[i]], rr[ii[i]])) {
			if (n_ > 0 && ll[ii[n_ - 1]] == ll[ii[i]])
				ii[n_ - 1] = ii[i];
			else
				ii[n_++] = ii[i];
		}
	i_ = 0;
	while (i_ + 1 < n_ && contains(ll[ii[n_ - 1]], rr[ii[n_ - 1]], ll[ii[i_]], rr[ii[i_]]))
		i_++;
	for (i = 0; i + i_ < n_; i++)
		ii[i] = ii[i + i_];
	n_ -= i_;
	for (i = 0, j = 0; i < n_; i++) {
		while (j < i + n_ && contains(ll[ii[i]], rr[ii[i]], ll[ii[j % n_]], ll[ii[j % n_]]))
			j++;
		jj[0][i] = (j - 1) % n_, dd[0][i] = (rr[ii[(j - 1) % n_]] - rr[ii[i]] + MD) % MD;
	}
	for (h = 0; h < H; h++)
		for (i = 0; i < n_; i++) {
			jj[h + 1][i] = jj[h][jj[h][i]];
			dd[h + 1][i] = dd[h][i] + dd[h][jj[h][i]];
		}
	k_ = n_ + 1;
	for (i = 0; i < n_; i++) {
		l = ll[ii[i]], r = rr[ii[i]];
		if (contains(l, r, l_, r_)) {
			printf("1\n");
			return 0;
		}
		if (!contains(l, r, l_, l_))
			continue;
		d = contains(l, r, r_, r_) ? MD - ((r - l + MD) % MD + 1) : (r_ - r + MD) % MD;
		if (d == 0) {
			printf("1\n");
			return 0;
		}
		if (dd[H][i] < d)
			continue;
		i_ = i, k = 2;
		for (h = H; h >= 0; h--)
			if (dd[h][i_] < d)
				k += 1 << h, d -= dd[h][i_], i_ = jj[h][i_];
		k_ = min(k_, k);
	}
	if (k_ == n_ + 1)
		k_ = 0;
	printf("%d\n", k_);
	return 0;
}

Compilation message (stderr)

flower.c: In function 'main':
flower.c:60:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |  scanf("%d", &n), l_ = idx(2, 0), r_ = idx(10, 29);
      |  ^~~~~~~~~~~~~~~
flower.c:64:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |   scanf("%d%d%d%d", &ml, &dl, &mr, &dr), ml--, dl--, mr--, dr--;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 2
• Subtask 2: 0 / 7
• Subtask 3: 0 / 9