답안 #494167

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
494167	2021-12-14T14:00:54 Z	rainboy	Newspapers (CEOI21_newspapers)	C	50 / 100	2 ms	360 KB

newspapers

/* https://csacademy.com/contest/archive/task/catch-the-thief */
#include <stdio.h>
#include <stdlib.h>

#define N	1000

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

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

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

int pp[N], i_, d_;

void dfs1(int p, int i, int d) {
	int o;

	pp[i] = p;
	if (d_ < d)
		i_ = i, d_ = d;
	for (o = eo[i]; o--; ) {
		int j = ej[i][o];

		if (j != p)
			dfs1(i, j, d + 1);
	}
}

char path[N];

int dfs2(int p, int i, int d) {
	int o;

	if (d >= 3)
		return 0;
	for (o = eo[i]; o--; ) {
		int j = ej[i][o];

		if (j != p && !path[j] && !dfs2(i, j, d + 1))
			return 0;
	}
	return 1;
}

int main() {
	static int qu[N], qu_[N * 5];
	int n, m, h, i, j, u, v, o, cnt;

	scanf("%d%d", &n, &m);
	if (m != n - 1) {
		printf("NO\n");
		return 0;
	}
	if (n == 1) {
		printf("YES\n");
		printf("1\n");
		printf("1\n");
		return 0;
	}
	if (n == 2) {
		printf("YES\n");
		printf("2\n");
		printf("1 1\n");
		return 0;
	}
	for (i = 0; i < n; i++)
		ej[i] = (int *) malloc(2 * sizeof *ej[i]);
	for (h = 0; h < m; h++) {
		scanf("%d%d", &i, &j), i--, j--;
		append(i, j), append(j, i);
	}
	i_ = -1, d_ = -1;
	dfs1(-1, 0, 0);
	u = i_;
	i_ = -1, d_ = -1;
	dfs1(-1, u, 0);
	v = i_;
	for (h = d_, i = v; h >= 0; h--, i = pp[i])
		path[qu[h] = i] = 1;
	path[u] = path[v] = 0;
	for (h = 1; h < d_; h++)
		if (!dfs2(-1, qu[h], 0)) {
			printf("NO\n");
			return 0;
		}
	cnt = 0;
	for (h = 1; h < d_; h++) {
		int special1, special2;

		i = qu[h], special1 = special2 = 1;
		for (o = 0; o < eo[i]; o++) {
			j = ej[i][o];
			if (!path[j]) {
				special1 = 0;
				if (eo[j] > 1) {
					special2 = 0;
					qu_[cnt++] = i, qu_[cnt++] = j;
				}
			}
		}
		for (o = eo[i]; o--; ) {
			j = ej[i][o];
			if (!path[j] && eo[j] > 1)
				qu_[cnt++] = j, qu_[cnt++] = i;
		}
		if (special1)
			qu_[cnt++] = i;
		else if (special2)
			qu_[cnt++] = i, qu_[cnt++] = i;
	}
	printf("YES\n");
	printf("%d\n", cnt);
	for (h = 0; h < cnt; h++)
		printf("%d ", qu_[h] + 1);
	printf("\n");
	return 0;
}

Compilation message

newspapers.c: In function 'append':
newspapers.c:12:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   12 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
newspapers.c: In function 'main':
newspapers.c:53:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
newspapers.c:73:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

Subtask #1

6.0 / 12.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	204 KB	Output is correct
2	Correct	0 ms	204 KB	Output is correct
3	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
4	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
5	Correct	0 ms	204 KB	Output is correct
6	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
7	Correct	0 ms	204 KB	Output is correct
8	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
9	Correct	0 ms	204 KB	Output is correct
10	Partially correct	0 ms	280 KB	Failed to provide a successful strategy.
11	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
12	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
13	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
14	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
15	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
16	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
17	Partially correct	0 ms	276 KB	Failed to provide a successful strategy.
18	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
19	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
20	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
21	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
22	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
23	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
24	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
25	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
26	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
27	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
28	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
29	Correct	0 ms	204 KB	Output is correct
30	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
31	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
32	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
33	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
34	Correct	1 ms	204 KB	Output is correct
35	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
36	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
37	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
38	Partially correct	0 ms	284 KB	Failed to provide a successful strategy.
39	Partially correct	0 ms	280 KB	Failed to provide a successful strategy.
40	Partially correct	0 ms	280 KB	Failed to provide a successful strategy.
41	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
42	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
43	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
44	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
45	Correct	0 ms	204 KB	Output is correct
46	Correct	1 ms	256 KB	Output is correct
47	Correct	0 ms	204 KB	Output is correct
48	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
49	Correct	0 ms	204 KB	Output is correct
50	Correct	0 ms	204 KB	Output is correct
51	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
52	Correct	0 ms	280 KB	Output is correct
53	Correct	0 ms	204 KB	Output is correct
54	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
55	Correct	0 ms	204 KB	Output is correct
56	Correct	0 ms	204 KB	Output is correct
57	Correct	0 ms	204 KB	Output is correct
58	Correct	0 ms	204 KB	Output is correct
59	Correct	1 ms	280 KB	Output is correct
60	Correct	0 ms	204 KB	Output is correct
61	Correct	0 ms	204 KB	Output is correct
62	Correct	0 ms	204 KB	Output is correct
63	Correct	0 ms	280 KB	Output is correct
64	Correct	0 ms	204 KB	Output is correct

Subtask #2

4.0 / 8.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	0 ms	204 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
5	Partially correct	0 ms	284 KB	Failed to provide a successful strategy.
6	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
7	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
8	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
9	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
10	Partially correct	0 ms	212 KB	Failed to provide a successful strategy.
11	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
12	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
13	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
14	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
15	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
16	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
17	Partially correct	2 ms	332 KB	Failed to provide a successful strategy.
18	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
19	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
20	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.

Subtask #3

40.0 / 80.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	204 KB	Output is correct
2	Correct	0 ms	204 KB	Output is correct
3	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
4	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
5	Correct	0 ms	204 KB	Output is correct
6	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
7	Correct	0 ms	204 KB	Output is correct
8	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
9	Correct	0 ms	204 KB	Output is correct
10	Partially correct	0 ms	280 KB	Failed to provide a successful strategy.
11	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
12	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
13	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
14	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
15	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
16	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
17	Partially correct	0 ms	276 KB	Failed to provide a successful strategy.
18	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
19	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
20	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
21	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
22	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
23	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
24	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
25	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
26	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
27	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
28	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
29	Correct	0 ms	204 KB	Output is correct
30	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
31	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
32	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
33	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
34	Correct	1 ms	204 KB	Output is correct
35	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
36	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
37	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
38	Partially correct	0 ms	284 KB	Failed to provide a successful strategy.
39	Partially correct	0 ms	280 KB	Failed to provide a successful strategy.
40	Partially correct	0 ms	280 KB	Failed to provide a successful strategy.
41	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
42	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
43	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
44	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
45	Correct	0 ms	204 KB	Output is correct
46	Correct	1 ms	256 KB	Output is correct
47	Correct	0 ms	204 KB	Output is correct
48	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
49	Correct	0 ms	204 KB	Output is correct
50	Correct	0 ms	204 KB	Output is correct
51	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
52	Correct	0 ms	280 KB	Output is correct
53	Correct	0 ms	204 KB	Output is correct
54	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
55	Correct	0 ms	204 KB	Output is correct
56	Correct	0 ms	204 KB	Output is correct
57	Correct	0 ms	204 KB	Output is correct
58	Correct	0 ms	204 KB	Output is correct
59	Correct	1 ms	280 KB	Output is correct
60	Correct	0 ms	204 KB	Output is correct
61	Correct	0 ms	204 KB	Output is correct
62	Correct	0 ms	204 KB	Output is correct
63	Correct	0 ms	280 KB	Output is correct
64	Correct	0 ms	204 KB	Output is correct
65	Correct	0 ms	204 KB	Output is correct
66	Correct	0 ms	204 KB	Output is correct
67	Partially correct	0 ms	204 KB	Failed to provide a successful strategy.
68	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
69	Correct	1 ms	204 KB	Output is correct
70	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
71	Correct	0 ms	204 KB	Output is correct
72	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
73	Correct	0 ms	204 KB	Output is correct
74	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
75	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
76	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
77	Partially correct	1 ms	204 KB	Failed to provide a successful strategy.
78	Partially correct	0 ms	276 KB	Failed to provide a successful strategy.
79	Correct	1 ms	332 KB	Output is correct
80	Correct	1 ms	332 KB	Output is correct
81	Correct	1 ms	332 KB	Output is correct
82	Correct	1 ms	332 KB	Output is correct
83	Correct	1 ms	332 KB	Output is correct
84	Correct	1 ms	332 KB	Output is correct
85	Correct	1 ms	332 KB	Output is correct
86	Correct	1 ms	332 KB	Output is correct
87	Correct	1 ms	332 KB	Output is correct
88	Correct	1 ms	332 KB	Output is correct
89	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
90	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
91	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
92	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
93	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
94	Partially correct	1 ms	360 KB	Failed to provide a successful strategy.
95	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
96	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
97	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
98	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
99	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
100	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
101	Partially correct	1 ms	284 KB	Failed to provide a successful strategy.
102	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
103	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
104	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
105	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
106	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
107	Partially correct	1 ms	280 KB	Failed to provide a successful strategy.
108	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
109	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
110	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
111	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
112	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
113	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
114	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
115	Partially correct	1 ms	280 KB	Failed to provide a successful strategy.
116	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
117	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
118	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
119	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
120	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
121	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
122	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
123	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
124	Partially correct	2 ms	332 KB	Failed to provide a successful strategy.
125	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
126	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
127	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
128	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
129	Correct	1 ms	332 KB	Output is correct
130	Correct	1 ms	328 KB	Output is correct
131	Correct	1 ms	332 KB	Output is correct
132	Correct	1 ms	332 KB	Output is correct
133	Correct	1 ms	284 KB	Output is correct
134	Correct	0 ms	204 KB	Output is correct
135	Correct	0 ms	204 KB	Output is correct
136	Correct	0 ms	204 KB	Output is correct
137	Correct	0 ms	204 KB	Output is correct
138	Correct	0 ms	204 KB	Output is correct
139	Correct	0 ms	204 KB	Output is correct
140	Correct	0 ms	204 KB	Output is correct
141	Correct	0 ms	204 KB	Output is correct
142	Correct	0 ms	204 KB	Output is correct
143	Correct	0 ms	204 KB	Output is correct
144	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.
145	Partially correct	1 ms	332 KB	Failed to provide a successful strategy.