Submission #875944

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
875944	2023-11-20T20:15:24 Z	rainboy	Tax Evasion (LMIO19_mokesciai)	C	100 / 100	57 ms	36524 KB

mokesciai

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

#define N	200000

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

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 qu[N], pp[N], dd[N], rr[N];

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

	qu[d] = i;
	pp[i] = p, dd[i] = d, rr[i] = d == 0 ? -1 : qu[d / 2 + 1];
	for (o = eo[i]; o--; ) {
		int j = ej[i][o];

		dfs1(i, j, d + 1);
	}
}

int cc[N], kk[N], jj[N], qq[N], d_;

void dfs2(int i) {
	int o, j_, u, v;

	kk[i] = 1;
	j_ = -1;
	for (o = eo[i]; o--; ) {
		int j = ej[i][o];

		dfs2(j);
		if (qq[j] != -1) {
			if (j_ == -1)
				j_ = j;
			else if (dd[qq[j_]] < dd[qq[j]]) {
				for (u = j_, v = j; u != qq[j_]; u = jj[u], v = jj[v])
					kk[v] += kk[u];
				kk[v] += kk[u];
				j_ = j;
			} else {
				for (u = j_, v = j; v != qq[j]; u = jj[u], v = jj[v])
					kk[u] += kk[v];
				kk[u] += kk[v];
			}
		}
	}
	jj[i] = j_, qq[i] = j_ == -1 ? i : qq[j_];
	while (cc[i]--) {
		d_ = min(d_, dd[qq[i]]);
		if (--kk[qq[i]] == 0)
			qq[i] = qq[i] == i ? -1 : pp[qq[i]];
	}
}

int main() {
	int n, m, i, j;

	scanf("%d%d", &n, &m);
	for (i = 0; i < n; i++)
		ej[i] = (int *) malloc(2 * sizeof *ej[i]);
	for (j = 1; j < n; j++) {
		scanf("%d", &i), i--;
		append(i, j);
	}
	dfs1(-1, 0, 0);
	while (m--) {
		scanf("%d", &i), i--;
		if (i == 0) {
			printf("1\n");
			return 0;
		}
		cc[rr[i]]++;
	}
	d_ = n;
	dfs2(0);
	printf("%d\n", d_ + 1);
	return 0;
}

Compilation message

mokesciai.c: In function 'append':
mokesciai.c:13:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   13 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
mokesciai.c: In function 'main':
mokesciai.c:69:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
mokesciai.c:73:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |   scanf("%d", &i), i--;
      |   ^~~~~~~~~~~~~~~
mokesciai.c:78:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |   scanf("%d", &i), i--;
      |   ^~~~~~~~~~~~~~~

Subtask #1

10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	6492 KB	Output is correct
2	Correct	1 ms	6492 KB	Output is correct
3	Correct	2 ms	7260 KB	Output is correct
4	Correct	2 ms	7260 KB	Output is correct
5	Correct	2 ms	7100 KB	Output is correct
6	Correct	38 ms	35108 KB	Output is correct
7	Correct	37 ms	35156 KB	Output is correct
8	Correct	1 ms	7256 KB	Output is correct
9	Correct	51 ms	36176 KB	Output is correct
10	Correct	57 ms	36524 KB	Output is correct
11	Correct	46 ms	35724 KB	Output is correct

Subtask #2

22.0 / 22.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	38 ms	35108 KB	Output is correct
2	Correct	37 ms	35156 KB	Output is correct
3	Correct	1 ms	7256 KB	Output is correct
4	Correct	1 ms	6492 KB	Output is correct
5	Correct	2 ms	6996 KB	Output is correct
6	Correct	1 ms	7004 KB	Output is correct
7	Correct	1 ms	6584 KB	Output is correct
8	Correct	1 ms	6836 KB	Output is correct
9	Correct	1 ms	6748 KB	Output is correct
10	Correct	30 ms	24272 KB	Output is correct
11	Correct	30 ms	24256 KB	Output is correct
12	Correct	31 ms	16464 KB	Output is correct
13	Correct	32 ms	25684 KB	Output is correct
14	Correct	22 ms	16220 KB	Output is correct
15	Correct	37 ms	16700 KB	Output is correct
16	Correct	32 ms	25684 KB	Output is correct
17	Correct	39 ms	16476 KB	Output is correct
18	Correct	32 ms	27660 KB	Output is correct
19	Correct	28 ms	17500 KB	Output is correct
20	Correct	29 ms	16724 KB	Output is correct
21	Correct	28 ms	16732 KB	Output is correct
22	Correct	28 ms	16724 KB	Output is correct
23	Correct	26 ms	16476 KB	Output is correct
24	Correct	27 ms	16436 KB	Output is correct

Subtask #3

39.0 / 39.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	6492 KB	Output is correct
2	Correct	1 ms	6492 KB	Output is correct
3	Correct	2 ms	7260 KB	Output is correct
4	Correct	2 ms	7260 KB	Output is correct
5	Correct	2 ms	7100 KB	Output is correct
6	Correct	1 ms	6492 KB	Output is correct
7	Correct	2 ms	6996 KB	Output is correct
8	Correct	1 ms	7004 KB	Output is correct
9	Correct	1 ms	6584 KB	Output is correct
10	Correct	1 ms	6836 KB	Output is correct
11	Correct	1 ms	6748 KB	Output is correct
12	Correct	1 ms	7256 KB	Output is correct
13	Correct	1 ms	6492 KB	Output is correct
14	Correct	1 ms	6492 KB	Output is correct
15	Correct	1 ms	6492 KB	Output is correct
16	Correct	1 ms	6492 KB	Output is correct
17	Correct	1 ms	6492 KB	Output is correct
18	Correct	1 ms	7004 KB	Output is correct
19	Correct	1 ms	7004 KB	Output is correct
20	Correct	2 ms	7000 KB	Output is correct
21	Correct	1 ms	6748 KB	Output is correct
22	Correct	1 ms	6748 KB	Output is correct
23	Correct	2 ms	6820 KB	Output is correct
24	Correct	2 ms	6748 KB	Output is correct
25	Correct	2 ms	6748 KB	Output is correct
26	Correct	2 ms	6748 KB	Output is correct
27	Correct	2 ms	7004 KB	Output is correct
28	Correct	2 ms	7004 KB	Output is correct
29	Correct	1 ms	6748 KB	Output is correct
30	Correct	2 ms	7004 KB	Output is correct
31	Correct	2 ms	6748 KB	Output is correct
32	Correct	1 ms	6748 KB	Output is correct
33	Correct	1 ms	6744 KB	Output is correct

Subtask #4

29.0 / 29.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	6492 KB	Output is correct
2	Correct	1 ms	6492 KB	Output is correct
3	Correct	1 ms	6492 KB	Output is correct
4	Correct	1 ms	6492 KB	Output is correct
5	Correct	1 ms	6492 KB	Output is correct
6	Correct	1 ms	7004 KB	Output is correct
7	Correct	1 ms	7004 KB	Output is correct
8	Correct	2 ms	7000 KB	Output is correct
9	Correct	1 ms	6748 KB	Output is correct
10	Correct	1 ms	6748 KB	Output is correct
11	Correct	2 ms	6820 KB	Output is correct
12	Correct	2 ms	6748 KB	Output is correct
13	Correct	2 ms	6748 KB	Output is correct
14	Correct	2 ms	6748 KB	Output is correct
15	Correct	2 ms	7004 KB	Output is correct
16	Correct	2 ms	7004 KB	Output is correct
17	Correct	1 ms	6748 KB	Output is correct
18	Correct	2 ms	7004 KB	Output is correct
19	Correct	2 ms	6748 KB	Output is correct
20	Correct	1 ms	6748 KB	Output is correct
21	Correct	1 ms	6744 KB	Output is correct
22	Correct	1 ms	6492 KB	Output is correct
23	Correct	1 ms	6492 KB	Output is correct
24	Correct	2 ms	7260 KB	Output is correct
25	Correct	2 ms	7260 KB	Output is correct
26	Correct	2 ms	7100 KB	Output is correct
27	Correct	1 ms	6492 KB	Output is correct
28	Correct	2 ms	6996 KB	Output is correct
29	Correct	1 ms	7004 KB	Output is correct
30	Correct	1 ms	6584 KB	Output is correct
31	Correct	1 ms	6836 KB	Output is correct
32	Correct	1 ms	6748 KB	Output is correct
33	Correct	38 ms	35108 KB	Output is correct
34	Correct	37 ms	35156 KB	Output is correct
35	Correct	1 ms	7256 KB	Output is correct
36	Correct	30 ms	24272 KB	Output is correct
37	Correct	30 ms	24256 KB	Output is correct
38	Correct	31 ms	16464 KB	Output is correct
39	Correct	32 ms	25684 KB	Output is correct
40	Correct	22 ms	16220 KB	Output is correct
41	Correct	37 ms	16700 KB	Output is correct
42	Correct	32 ms	25684 KB	Output is correct
43	Correct	39 ms	16476 KB	Output is correct
44	Correct	32 ms	27660 KB	Output is correct
45	Correct	28 ms	17500 KB	Output is correct
46	Correct	29 ms	16724 KB	Output is correct
47	Correct	28 ms	16732 KB	Output is correct
48	Correct	28 ms	16724 KB	Output is correct
49	Correct	26 ms	16476 KB	Output is correct
50	Correct	27 ms	16436 KB	Output is correct
51	Correct	51 ms	36176 KB	Output is correct
52	Correct	57 ms	36524 KB	Output is correct
53	Correct	46 ms	35724 KB	Output is correct
54	Correct	33 ms	24560 KB	Output is correct
55	Correct	33 ms	24508 KB	Output is correct
56	Correct	37 ms	26704 KB	Output is correct
57	Correct	30 ms	16948 KB	Output is correct
58	Correct	30 ms	16688 KB	Output is correct
59	Correct	41 ms	20908 KB	Output is correct
60	Correct	43 ms	17236 KB	Output is correct
61	Correct	49 ms	26908 KB	Output is correct
62	Correct	46 ms	17020 KB	Output is correct
63	Correct	38 ms	28448 KB	Output is correct
64	Correct	33 ms	18000 KB	Output is correct
65	Correct	34 ms	16916 KB	Output is correct
66	Correct	38 ms	17308 KB	Output is correct
67	Correct	37 ms	17400 KB	Output is correct
68	Correct	38 ms	16972 KB	Output is correct
69	Correct	39 ms	17236 KB	Output is correct
70	Correct	19 ms	12380 KB	Output is correct
71	Correct	40 ms	23672 KB	Output is correct