Submission #544723

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
544723	2022-04-02T16:11:10 Z	rainboy	Tug of War (BOI15_tug)	C	100 / 100	306 ms	6372 KB

tug

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

#define N	30000
#define N_	(N * 2)
#define W	20
#define S	(N * W)

int ii[N_], jj[N_], ww[N_];
int *eh[N_], eo[N_];

void link(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;
}

char visited[N_], visited_[N_]; int qu1[N_], qu2[N_], cnt, cnt_;

void dfs1(int i) {
	int o;

	if (visited[i])
		return;
	visited[i] = 1, qu1[cnt++] = i;
	for (o = 0; o < eo[i]; o++) {
		int h = eh[i][o];

		if (!visited_[h]) {
			int j = i ^ ii[h] ^ jj[h];

			visited_[h] = 1, qu2[cnt_++] = h;
			dfs1(j);
		}
	}
}

int main() {
	static int ae[N_], dd[N_], qu_[N_], kk[S + 1], dq[S + 1];
	static char used[N_], dp[S + 1];
	int n, d_, h, h_, i, j, d, w, s;

	scanf("%d%d", &n, &d_);
	for (i = 0; i < n * 2; i++)
		eh[i] = (int *) malloc(2 * sizeof *eh[i]);
	for (h = 0; h < n * 2; h++) {
		scanf("%d%d%d", &i, &j, &w), i--, j--, j += n;
		ae[i] ^= h, dd[i]++;
		ae[j] ^= h, dd[j]++;
		ii[h] = i, jj[h] = j, ww[h] = w;
		link(i, h), link(j, h);
	}
	d = 0;
	for (i = 0; i < n * 2; i++)
		if (!visited[i]) {
			cnt = 0, cnt_ = 0;
			dfs1(i);
			if (cnt != cnt_) {
				printf("NO\n");
				return 0;
			}
			for (h = 0; h < cnt; h++)
				dd[qu1[h]] = eo[qu1[h]];
			cnt_ = 0;
			for (h = 0; h < cnt; h++)
				if (dd[qu1[h]] == 1)
					qu_[cnt_++] = qu1[h];
			while (cnt_) {
				i = qu_[--cnt_], h = ae[i], j = i ^ ii[h] ^ jj[h];
				used[h] = 1, d += i < n ? ww[h] : -ww[h];
				ae[i] ^= h, dd[i]--;
				ae[j] ^= h, dd[j]--;
				if (dd[j] == 1)
					qu_[cnt_++] = j;
			}
			for (h = 0; h < cnt; h++)
				if (!used[qu2[h]]) {
					h_ = qu2[h], i = ii[h_];
					break;
				}
			j = i;
			w = 0;
			do {
				h_ = ae[j] ^ h_;
				w += j < n ? ww[h_] : -ww[h_];
				j ^= ii[h_] ^ jj[h_];
			} while (j != i);
			if (w < 0)
				w = -w;
			d += w;
			kk[w]++;
		}
	dp[0] = 1;
	for (w = 0; w <= S; w++)
		if (kk[w] > 0) {
			int k = kk[w];

			for (s = 0; s <= S && s * 2 <= d + d_; s++)
				if (dp[s])
					dq[s] = 0;
				else if ((dq[s] = (s < w ? k : dq[s - w]) + 1) <= k)
					dp[s] = 1;
		}
	for (s = 0; s <= S && s * 2 <= d + d_; s++)
		if (dp[s] && d - s * 2 <= d_) {
			printf("YES\n");
			return 0;
		}
	printf("NO\n");
	return 0;
}

Compilation message

tug.c: In function 'link':
tug.c:16:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   16 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
tug.c: In function 'main':
tug.c:46:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |  scanf("%d%d", &n, &d_);
      |  ^~~~~~~~~~~~~~~~~~~~~~
tug.c:50:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |   scanf("%d%d%d", &i, &j, &w), i--, j--, j += n;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
tug.c:87:8: warning: 'h_' may be used uninitialized in this function [-Wmaybe-uninitialized]
   87 |     h_ = ae[j] ^ h_;
      |     ~~~^~~~~~~~~~~~

Subtask #1

18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	1 ms	296 KB	Output is correct
3	Correct	1 ms	340 KB	Output is correct
4	Correct	1 ms	340 KB	Output is correct
5	Correct	1 ms	340 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	1 ms	340 KB	Output is correct
8	Correct	1 ms	340 KB	Output is correct
9	Correct	1 ms	340 KB	Output is correct
10	Correct	1 ms	340 KB	Output is correct
11	Correct	1 ms	292 KB	Output is correct
12	Correct	1 ms	340 KB	Output is correct
13	Correct	1 ms	340 KB	Output is correct
14	Correct	1 ms	296 KB	Output is correct
15	Correct	1 ms	340 KB	Output is correct
16	Correct	1 ms	340 KB	Output is correct
17	Correct	1 ms	292 KB	Output is correct
18	Correct	1 ms	340 KB	Output is correct
19	Correct	1 ms	340 KB	Output is correct
20	Correct	1 ms	340 KB	Output is correct
21	Correct	0 ms	212 KB	Output is correct
22	Correct	1 ms	292 KB	Output is correct
23	Correct	1 ms	340 KB	Output is correct
24	Correct	1 ms	340 KB	Output is correct
25	Correct	1 ms	296 KB	Output is correct

Subtask #2

30.0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	1 ms	296 KB	Output is correct
3	Correct	1 ms	340 KB	Output is correct
4	Correct	1 ms	340 KB	Output is correct
5	Correct	1 ms	340 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	1 ms	340 KB	Output is correct
8	Correct	1 ms	340 KB	Output is correct
9	Correct	1 ms	340 KB	Output is correct
10	Correct	1 ms	340 KB	Output is correct
11	Correct	1 ms	292 KB	Output is correct
12	Correct	1 ms	340 KB	Output is correct
13	Correct	1 ms	340 KB	Output is correct
14	Correct	1 ms	296 KB	Output is correct
15	Correct	1 ms	340 KB	Output is correct
16	Correct	1 ms	340 KB	Output is correct
17	Correct	1 ms	292 KB	Output is correct
18	Correct	1 ms	340 KB	Output is correct
19	Correct	1 ms	340 KB	Output is correct
20	Correct	1 ms	340 KB	Output is correct
21	Correct	0 ms	212 KB	Output is correct
22	Correct	1 ms	292 KB	Output is correct
23	Correct	1 ms	340 KB	Output is correct
24	Correct	1 ms	340 KB	Output is correct
25	Correct	1 ms	296 KB	Output is correct
26	Correct	2 ms	588 KB	Output is correct
27	Correct	7 ms	744 KB	Output is correct
28	Correct	2 ms	596 KB	Output is correct
29	Correct	7 ms	724 KB	Output is correct
30	Correct	2 ms	596 KB	Output is correct
31	Correct	7 ms	736 KB	Output is correct
32	Correct	2 ms	584 KB	Output is correct
33	Correct	7 ms	736 KB	Output is correct
34	Correct	3 ms	596 KB	Output is correct
35	Correct	7 ms	716 KB	Output is correct
36	Correct	2 ms	596 KB	Output is correct
37	Correct	7 ms	724 KB	Output is correct
38	Correct	3 ms	596 KB	Output is correct
39	Correct	7 ms	692 KB	Output is correct
40	Correct	2 ms	596 KB	Output is correct
41	Correct	6 ms	724 KB	Output is correct
42	Correct	3 ms	596 KB	Output is correct
43	Correct	7 ms	724 KB	Output is correct
44	Correct	2 ms	596 KB	Output is correct
45	Correct	7 ms	716 KB	Output is correct
46	Correct	2 ms	596 KB	Output is correct
47	Correct	2 ms	596 KB	Output is correct
48	Correct	3 ms	596 KB	Output is correct
49	Correct	3 ms	596 KB	Output is correct
50	Correct	3 ms	692 KB	Output is correct
51	Correct	3 ms	812 KB	Output is correct

Subtask #3

23.0 / 23.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	9 ms	1844 KB	Output is correct
2	Correct	7 ms	1748 KB	Output is correct
3	Correct	9 ms	1844 KB	Output is correct
4	Correct	7 ms	1748 KB	Output is correct
5	Correct	9 ms	1804 KB	Output is correct
6	Correct	7 ms	1748 KB	Output is correct
7	Correct	9 ms	1804 KB	Output is correct
8	Correct	7 ms	1820 KB	Output is correct
9	Correct	9 ms	1748 KB	Output is correct
10	Correct	7 ms	1748 KB	Output is correct
11	Correct	8 ms	1844 KB	Output is correct
12	Correct	7 ms	1748 KB	Output is correct
13	Correct	9 ms	1748 KB	Output is correct
14	Correct	10 ms	1748 KB	Output is correct
15	Correct	7 ms	1748 KB	Output is correct
16	Correct	9 ms	1764 KB	Output is correct
17	Correct	7 ms	1844 KB	Output is correct
18	Correct	8 ms	1876 KB	Output is correct
19	Correct	7 ms	1740 KB	Output is correct
20	Correct	8 ms	1876 KB	Output is correct
21	Correct	8 ms	2100 KB	Output is correct
22	Correct	10 ms	1876 KB	Output is correct

Subtask #4

29.0 / 29.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	1 ms	296 KB	Output is correct
3	Correct	1 ms	340 KB	Output is correct
4	Correct	1 ms	340 KB	Output is correct
5	Correct	1 ms	340 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	1 ms	340 KB	Output is correct
8	Correct	1 ms	340 KB	Output is correct
9	Correct	1 ms	340 KB	Output is correct
10	Correct	1 ms	340 KB	Output is correct
11	Correct	1 ms	292 KB	Output is correct
12	Correct	1 ms	340 KB	Output is correct
13	Correct	1 ms	340 KB	Output is correct
14	Correct	1 ms	296 KB	Output is correct
15	Correct	1 ms	340 KB	Output is correct
16	Correct	1 ms	340 KB	Output is correct
17	Correct	1 ms	292 KB	Output is correct
18	Correct	1 ms	340 KB	Output is correct
19	Correct	1 ms	340 KB	Output is correct
20	Correct	1 ms	340 KB	Output is correct
21	Correct	0 ms	212 KB	Output is correct
22	Correct	1 ms	292 KB	Output is correct
23	Correct	1 ms	340 KB	Output is correct
24	Correct	1 ms	340 KB	Output is correct
25	Correct	1 ms	296 KB	Output is correct
26	Correct	2 ms	588 KB	Output is correct
27	Correct	7 ms	744 KB	Output is correct
28	Correct	2 ms	596 KB	Output is correct
29	Correct	7 ms	724 KB	Output is correct
30	Correct	2 ms	596 KB	Output is correct
31	Correct	7 ms	736 KB	Output is correct
32	Correct	2 ms	584 KB	Output is correct
33	Correct	7 ms	736 KB	Output is correct
34	Correct	3 ms	596 KB	Output is correct
35	Correct	7 ms	716 KB	Output is correct
36	Correct	2 ms	596 KB	Output is correct
37	Correct	7 ms	724 KB	Output is correct
38	Correct	3 ms	596 KB	Output is correct
39	Correct	7 ms	692 KB	Output is correct
40	Correct	2 ms	596 KB	Output is correct
41	Correct	6 ms	724 KB	Output is correct
42	Correct	3 ms	596 KB	Output is correct
43	Correct	7 ms	724 KB	Output is correct
44	Correct	2 ms	596 KB	Output is correct
45	Correct	7 ms	716 KB	Output is correct
46	Correct	2 ms	596 KB	Output is correct
47	Correct	2 ms	596 KB	Output is correct
48	Correct	3 ms	596 KB	Output is correct
49	Correct	3 ms	596 KB	Output is correct
50	Correct	3 ms	692 KB	Output is correct
51	Correct	3 ms	812 KB	Output is correct
52	Correct	9 ms	1844 KB	Output is correct
53	Correct	7 ms	1748 KB	Output is correct
54	Correct	9 ms	1844 KB	Output is correct
55	Correct	7 ms	1748 KB	Output is correct
56	Correct	9 ms	1804 KB	Output is correct
57	Correct	7 ms	1748 KB	Output is correct
58	Correct	9 ms	1804 KB	Output is correct
59	Correct	7 ms	1820 KB	Output is correct
60	Correct	9 ms	1748 KB	Output is correct
61	Correct	7 ms	1748 KB	Output is correct
62	Correct	8 ms	1844 KB	Output is correct
63	Correct	7 ms	1748 KB	Output is correct
64	Correct	9 ms	1748 KB	Output is correct
65	Correct	10 ms	1748 KB	Output is correct
66	Correct	7 ms	1748 KB	Output is correct
67	Correct	9 ms	1764 KB	Output is correct
68	Correct	7 ms	1844 KB	Output is correct
69	Correct	8 ms	1876 KB	Output is correct
70	Correct	7 ms	1740 KB	Output is correct
71	Correct	8 ms	1876 KB	Output is correct
72	Correct	8 ms	2100 KB	Output is correct
73	Correct	10 ms	1876 KB	Output is correct
74	Correct	27 ms	5448 KB	Output is correct
75	Correct	302 ms	6336 KB	Output is correct
76	Correct	26 ms	5452 KB	Output is correct
77	Correct	293 ms	6336 KB	Output is correct
78	Correct	26 ms	5460 KB	Output is correct
79	Correct	26 ms	5464 KB	Output is correct
80	Correct	291 ms	6316 KB	Output is correct
81	Correct	30 ms	6136 KB	Output is correct
82	Correct	22 ms	6220 KB	Output is correct
83	Correct	28 ms	5400 KB	Output is correct
84	Correct	291 ms	6364 KB	Output is correct
85	Correct	28 ms	5452 KB	Output is correct
86	Correct	306 ms	6272 KB	Output is correct
87	Correct	27 ms	5448 KB	Output is correct
88	Correct	296 ms	6272 KB	Output is correct
89	Correct	28 ms	5468 KB	Output is correct
90	Correct	296 ms	6372 KB	Output is correct
91	Correct	27 ms	5404 KB	Output is correct
92	Correct	289 ms	6316 KB	Output is correct
93	Correct	26 ms	5476 KB	Output is correct
94	Correct	26 ms	4940 KB	Output is correct
95	Correct	27 ms	5044 KB	Output is correct
96	Correct	28 ms	4996 KB	Output is correct
97	Correct	29 ms	6244 KB	Output is correct
98	Correct	32 ms	6316 KB	Output is correct