제출 #548887

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
548887		rainboy	Pinball (JOI14_pinball)	C11	100 / 100	136 ms	23372 KiB

pinball

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

#define N	100000
#define N3	(N * 3 + 2)
#define N_	(1 << 19)	/* N_ = pow2(ceil(log2(N3))) */
#define INF	0x3f3f3f3f3f3f3f3fLL

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

unsigned int X = 12345;

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

int xx[N3];

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 (xx[ii[j]] == xx[i_])
				j++;
			else if (xx[ii[j]] < xx[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 n_;

void update(long long *st, int i, long long x) {
	for (i += n_; i > 0; i >>= 1)
		st[i] = min(st[i], x);
}

long long query(long long *st, int l, int r) {
	long long x = INF;

	for (l += n_, r += n_; l <= r; l >>= 1, r >>= 1) {
		if ((l & 1) == 1)
			x = min(x, st[l++]);
		if ((r & 1) == 0)
			x = min(x, st[r--]);
	}
	return x;
}

int main() {
	static int cc[N], ii[N3];
	static long long st1[N_ * 2], st2[N_ * 2];
	int n, n3, m, i, x;
	long long ans;

	scanf("%d%d", &n, &m), n3 = n * 3 + 2;
	for (i = 0; i < n; i++)
		scanf("%d%d%d%d", &xx[i * 3 + 0], &xx[i * 3 + 1], &xx[i * 3 + 2], &cc[i]);
	xx[n * 3] = 1, xx[n * 3 + 1] = m;
	for (i = 0; i < n3; i++)
		ii[i] = i;
	sort(ii, 0, n3);
	for (i = 0, x = 0; i < n3; i++)
		xx[ii[i]] = i + 1 == n3 || xx[ii[i + 1]] != xx[ii[i]] ? x++ : x;
	n_ = 1;
	while (n_ < n3)
		n_ <<= 1;
	memset(st1, 0x3f, n_ * 2 * sizeof *st1), memset(st2, 0x3f, n_ * 2 * sizeof *st2);
	update(st1, xx[n * 3], 0), update(st2, xx[n * 3 + 1], 0);
	ans = INF;
	for (i = 0; i < n; i++) {
		long long x1 = query(st1, xx[i * 3 + 0], xx[i * 3 + 1]);
		long long x2 = query(st2, xx[i * 3 + 0], xx[i * 3 + 1]);

		if (x1 != INF && x2 != INF)
			ans = min(ans, x1 + x2 + cc[i]);
		if (x1 != INF)
			update(st1, xx[i * 3 + 2], x1 + cc[i]);
		if (x2 != INF)
			update(st2, xx[i * 3 + 2], x2 + cc[i]);
	}
	if (ans == INF)
		ans = -1;
	printf("%lld\n", ans);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

pinball.c: In function 'main':
pinball.c:63:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |  scanf("%d%d", &n, &m), n3 = n * 3 + 2;
      |  ^~~~~~~~~~~~~~~~~~~~~
pinball.c:65:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |   scanf("%d%d%d%d", &xx[i * 3 + 0], &xx[i * 3 + 1], &xx[i * 3 + 2], &cc[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 18 / 18
• Subtask 3: 22 / 22
• Subtask 4: 49 / 49