Submission #378041

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
378041	2021-03-15T18:55:18 Z	rainboy	Jakarta Skyscrapers (APIO15_skyscraper)	C	100 / 100	105 ms	3052 KB

skyscraper

/* https://oj.uz/submission/216252 (Benq) */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define N	30000
#define M	30000
#define M_	(M * 2 + 1)

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

unsigned int X = 12345;

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

int *eh[N], eo[N];

void append(int i, int h) {
	int o = eo[i]++;

	if (o >= 2 && (o & o - 1) == 0)
		eh[i] = (int *) realloc(eh[i], o * 2 * sizeof *eh[i]);
	eh[i][o] = h;
}

int ii[M], jj[M], rr[M];

int compare(int h1, int h2) {
	return jj[h1] != jj[h2] ? jj[h1] - jj[h2] : (rr[h1] != rr[h2] ? rr[h1] - rr[h2] : ii[h1] - ii[h2]);
}

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 main() {
	static int hh[M], kl[M], kr[M], qu[M_], dd[M_];
	int n, m, h, i, j, s, t, o, head, tail;

	scanf("%d%d", &n, &m);
	for (i = 0; i < n; i++)
		eh[i] = (int *) malloc(2 * sizeof *eh[i]);
	for (h = 0; h < m; h++) {
		scanf("%d%d", &i, &j);
		ii[h] = i, jj[h] = j, rr[h] = i % j;
		append(i, h);
	}
	for (h = 0; h < m; h++)
		hh[h] = h;
	sort(hh, 0, m);
	for (h = 0; h < m; h++) {
		int h_, p, q, r;

		h_ = hh[h], p = h == 0 ? -1 : hh[h - 1], q = h + 1 == m ? -1 : hh[h + 1];
		i = ii[h_], j = jj[h_], r = rr[h_];
		kl[h_] = h == 0 || jj[p] != j || rr[p] != r ? i / j : (i - ii[p]) / j;
		kr[h_] = h + 1 == m || jj[q] != j || rr[q] != r ? (n - 1 - i) / j : (ii[q] - i) / j;
	}
	s = ii[0], t = ii[1];
	if (s == t) {
		printf("0\n");
		return 0;
	}
	head = tail = 0;
	i = s;
	for (o = eo[i]; o--; ) {
		h = eh[i][o];
		if (kl[h] > 0)
			qu[tail] = h * N + kl[h] - 1, tail = tail + 1 == M_ ? 0 : tail + 1;
		if (kr[h] > 0)
			qu[tail] = h * N + kl[h] + 1, tail = tail + 1 == M_ ? 0 : tail + 1;
	}
	eo[i] = 0;
	while (head != tail) {
		int hk, k, d;

		hk = qu[head], d = dd[head] + 1, head = head + 1 == M_ ? 0 : head + 1;
		h = hk / N, k = hk % N - kl[h], i = ii[h] + k * jj[h];
		if (i == t) {
			printf("%d\n", d);
			return 0;
		}
		if (k < 0 && k > -kl[h])
			dd[tail] = d, qu[tail] = h * N + kl[h] + k - 1, tail = tail + 1 == M_ ? 0 : tail + 1;
		else if (k > 0 && k < kr[h])
			dd[tail] = d, qu[tail] = h * N + kl[h] + k + 1, tail = tail + 1 == M_ ? 0 : tail + 1;
		if (eo[i]) {
			for (o = eo[i]; o--; ) {
				h = eh[i][o];
				if (kl[h] > 0)
					dd[tail] = d, qu[tail] = h * N + kl[h] - 1, tail = tail + 1 == M_ ? 0 : tail + 1;
				if (kr[h] > 0)
					dd[tail] = d, qu[tail] = h * N + kl[h] + 1, tail = tail + 1 == M_ ? 0 : tail + 1;
			}
			eo[i] = 0;
		}
	}
	printf("-1\n");
	return 0;
}

Compilation message

skyscraper.c: In function 'append':
skyscraper.c:23:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   23 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
skyscraper.c: In function 'main':
skyscraper.c:60:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   60 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
skyscraper.c:64:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   64 |   scanf("%d%d", &i, &j);
      |   ^~~~~~~~~~~~~~~~~~~~~

Subtask #1

10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	364 KB	Output is correct
2	Correct	0 ms	364 KB	Output is correct
3	Correct	1 ms	364 KB	Output is correct
4	Correct	1 ms	364 KB	Output is correct
5	Correct	0 ms	364 KB	Output is correct
6	Correct	0 ms	364 KB	Output is correct
7	Correct	1 ms	364 KB	Output is correct

Subtask #2

12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	364 KB	Output is correct
2	Correct	0 ms	364 KB	Output is correct
3	Correct	0 ms	364 KB	Output is correct
4	Correct	0 ms	364 KB	Output is correct
5	Correct	0 ms	364 KB	Output is correct
6	Correct	0 ms	364 KB	Output is correct
7	Correct	0 ms	364 KB	Output is correct
8	Correct	0 ms	364 KB	Output is correct
9	Correct	0 ms	364 KB	Output is correct
10	Correct	1 ms	364 KB	Output is correct
11	Correct	1 ms	364 KB	Output is correct
12	Correct	1 ms	364 KB	Output is correct
13	Correct	2 ms	364 KB	Output is correct
14	Correct	2 ms	492 KB	Output is correct
15	Correct	2 ms	392 KB	Output is correct

Subtask #3

14.0 / 14.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	364 KB	Output is correct
2	Correct	0 ms	364 KB	Output is correct
3	Correct	0 ms	364 KB	Output is correct
4	Correct	0 ms	364 KB	Output is correct
5	Correct	0 ms	364 KB	Output is correct
6	Correct	0 ms	364 KB	Output is correct
7	Correct	1 ms	364 KB	Output is correct
8	Correct	0 ms	364 KB	Output is correct
9	Correct	0 ms	364 KB	Output is correct
10	Correct	1 ms	364 KB	Output is correct
11	Correct	1 ms	364 KB	Output is correct
12	Correct	1 ms	364 KB	Output is correct
13	Correct	1 ms	364 KB	Output is correct
14	Correct	1 ms	492 KB	Output is correct
15	Correct	1 ms	364 KB	Output is correct
16	Correct	1 ms	364 KB	Output is correct
17	Correct	1 ms	492 KB	Output is correct
18	Correct	1 ms	492 KB	Output is correct
19	Correct	1 ms	492 KB	Output is correct
20	Correct	1 ms	492 KB	Output is correct
21	Correct	1 ms	364 KB	Output is correct
22	Correct	1 ms	492 KB	Output is correct
23	Correct	1 ms	492 KB	Output is correct
24	Correct	2 ms	492 KB	Output is correct
25	Correct	1 ms	492 KB	Output is correct
26	Correct	1 ms	492 KB	Output is correct
27	Correct	1 ms	492 KB	Output is correct
28	Correct	2 ms	620 KB	Output is correct
29	Correct	1 ms	876 KB	Output is correct
30	Correct	1 ms	492 KB	Output is correct
31	Correct	1 ms	748 KB	Output is correct
32	Correct	1 ms	620 KB	Output is correct
33	Correct	2 ms	1004 KB	Output is correct
34	Correct	2 ms	1004 KB	Output is correct

Subtask #4

21.0 / 21.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	364 KB	Output is correct
2	Correct	0 ms	384 KB	Output is correct
3	Correct	1 ms	364 KB	Output is correct
4	Correct	0 ms	364 KB	Output is correct
5	Correct	0 ms	364 KB	Output is correct
6	Correct	0 ms	364 KB	Output is correct
7	Correct	0 ms	364 KB	Output is correct
8	Correct	0 ms	364 KB	Output is correct
9	Correct	0 ms	364 KB	Output is correct
10	Correct	1 ms	364 KB	Output is correct
11	Correct	1 ms	364 KB	Output is correct
12	Correct	1 ms	364 KB	Output is correct
13	Correct	1 ms	364 KB	Output is correct
14	Correct	1 ms	492 KB	Output is correct
15	Correct	1 ms	364 KB	Output is correct
16	Correct	1 ms	364 KB	Output is correct
17	Correct	1 ms	492 KB	Output is correct
18	Correct	1 ms	492 KB	Output is correct
19	Correct	1 ms	492 KB	Output is correct
20	Correct	1 ms	492 KB	Output is correct
21	Correct	1 ms	364 KB	Output is correct
22	Correct	1 ms	492 KB	Output is correct
23	Correct	1 ms	492 KB	Output is correct
24	Correct	1 ms	492 KB	Output is correct
25	Correct	2 ms	492 KB	Output is correct
26	Correct	2 ms	492 KB	Output is correct
27	Correct	1 ms	492 KB	Output is correct
28	Correct	2 ms	620 KB	Output is correct
29	Correct	1 ms	876 KB	Output is correct
30	Correct	1 ms	492 KB	Output is correct
31	Correct	1 ms	748 KB	Output is correct
32	Correct	1 ms	620 KB	Output is correct
33	Correct	2 ms	1004 KB	Output is correct
34	Correct	3 ms	1004 KB	Output is correct
35	Correct	12 ms	1388 KB	Output is correct
36	Correct	2 ms	492 KB	Output is correct
37	Correct	9 ms	1132 KB	Output is correct
38	Correct	14 ms	1388 KB	Output is correct
39	Correct	14 ms	1260 KB	Output is correct
40	Correct	14 ms	1388 KB	Output is correct
41	Correct	14 ms	1516 KB	Output is correct
42	Correct	7 ms	1272 KB	Output is correct
43	Correct	8 ms	1260 KB	Output is correct
44	Correct	7 ms	1260 KB	Output is correct
45	Correct	17 ms	1772 KB	Output is correct
46	Correct	15 ms	1772 KB	Output is correct

Subtask #5

43.0 / 43.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	364 KB	Output is correct
2	Correct	0 ms	364 KB	Output is correct
3	Correct	0 ms	364 KB	Output is correct
4	Correct	0 ms	364 KB	Output is correct
5	Correct	0 ms	364 KB	Output is correct
6	Correct	0 ms	364 KB	Output is correct
7	Correct	0 ms	364 KB	Output is correct
8	Correct	0 ms	364 KB	Output is correct
9	Correct	1 ms	364 KB	Output is correct
10	Correct	1 ms	364 KB	Output is correct
11	Correct	2 ms	364 KB	Output is correct
12	Correct	1 ms	364 KB	Output is correct
13	Correct	1 ms	364 KB	Output is correct
14	Correct	2 ms	492 KB	Output is correct
15	Correct	1 ms	364 KB	Output is correct
16	Correct	1 ms	364 KB	Output is correct
17	Correct	1 ms	492 KB	Output is correct
18	Correct	1 ms	492 KB	Output is correct
19	Correct	1 ms	492 KB	Output is correct
20	Correct	1 ms	492 KB	Output is correct
21	Correct	1 ms	364 KB	Output is correct
22	Correct	1 ms	492 KB	Output is correct
23	Correct	1 ms	492 KB	Output is correct
24	Correct	1 ms	492 KB	Output is correct
25	Correct	1 ms	492 KB	Output is correct
26	Correct	1 ms	492 KB	Output is correct
27	Correct	1 ms	492 KB	Output is correct
28	Correct	2 ms	620 KB	Output is correct
29	Correct	1 ms	876 KB	Output is correct
30	Correct	1 ms	492 KB	Output is correct
31	Correct	1 ms	748 KB	Output is correct
32	Correct	1 ms	620 KB	Output is correct
33	Correct	3 ms	1004 KB	Output is correct
34	Correct	2 ms	1004 KB	Output is correct
35	Correct	14 ms	1420 KB	Output is correct
36	Correct	2 ms	492 KB	Output is correct
37	Correct	9 ms	1152 KB	Output is correct
38	Correct	18 ms	1388 KB	Output is correct
39	Correct	14 ms	1260 KB	Output is correct
40	Correct	14 ms	1388 KB	Output is correct
41	Correct	17 ms	1644 KB	Output is correct
42	Correct	7 ms	1260 KB	Output is correct
43	Correct	7 ms	1260 KB	Output is correct
44	Correct	7 ms	1260 KB	Output is correct
45	Correct	17 ms	1772 KB	Output is correct
46	Correct	17 ms	1772 KB	Output is correct
47	Correct	16 ms	1644 KB	Output is correct
48	Correct	12 ms	1900 KB	Output is correct
49	Correct	12 ms	1900 KB	Output is correct
50	Correct	8 ms	1900 KB	Output is correct
51	Correct	16 ms	2540 KB	Output is correct
52	Correct	17 ms	2668 KB	Output is correct
53	Correct	16 ms	2412 KB	Output is correct
54	Correct	2 ms	1644 KB	Output is correct
55	Correct	2 ms	1644 KB	Output is correct
56	Correct	21 ms	2796 KB	Output is correct
57	Correct	4 ms	1644 KB	Output is correct
58	Correct	8 ms	2796 KB	Output is correct
59	Correct	9 ms	2796 KB	Output is correct
60	Correct	9 ms	2924 KB	Output is correct
61	Correct	9 ms	2924 KB	Output is correct
62	Correct	20 ms	2796 KB	Output is correct
63	Correct	37 ms	2924 KB	Output is correct
64	Correct	42 ms	2796 KB	Output is correct
65	Correct	55 ms	3052 KB	Output is correct
66	Correct	105 ms	2924 KB	Output is correct
67	Correct	50 ms	2828 KB	Output is correct