oj.uz

Submission #831438

# Submission time Handle Problem Language Result Execution time Memory
831438 2023-08-20T08:59:13 Z rainboy LOSTIKS (INOI20_lostiks) C
100 / 100
 1604 ms 246508 KB 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define N	1000000
#define M	20
#define INF	0x3f3f3f3f

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

int n, m;

int *ej[N], *eg[N], eo[N];
int uu[M], vv[M];

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

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

int dd[N], pp[N], qq[N], bb[N];

int dfs1(int p, int i, int d, int b) {
	int o, s, k_, j_;

	pp[i] = p, dd[i] = d, bb[i] = b;
	s = 1, k_ = 0, j_ = -1;
	for (o = eo[i]; o--; ) {
		int j = ej[i][o], g = eg[i][o];

		if (j != p) {
			int k = dfs1(i, j, d + 1, g == -1 ? b : b | 1 << g);

			s += k;
			if (k_ < k)
				k_ = k, j_ = j;
			if (g != -1)
				vv[g] = i;
		}
	}
	qq[i] = j_;
	return s;
}

void dfs2(int p, int i, int q) {
	int o, j_;

	j_ = qq[i], qq[i] = q;
	if (j_ != -1)
		dfs2(i, j_, q);
	for (o = eo[i]; o--; ) {
		int j = ej[i][o];

		if (j != p && j != j_)
			dfs2(i, j, j);
	}
}

int lca(int i, int j) {
	while (qq[i] != qq[j])
		if (dd[qq[i]] > dd[qq[j]])
			i = pp[qq[i]];
		else
			j = pp[qq[j]];
	return dd[i] < dd[j] ? i : j;
}

int dist(int i, int j) {
	return dd[i] + dd[j] - dd[lca(i, j)] * 2;
}

int main() {
	static int dds[M], ddt[M], ddd[M][M], bb_[M], dp[1 << M][M], gg[M];
	int k, g, g_, h, i, j, u, b, s, t, d, ans;

	scanf("%d%d%d", &n, &s, &t), s--, t--;
	for (i = 0; i < n; i++) {
		ej[i] = (int *) malloc(2 * sizeof *ej[i]);
		eg[i] = (int *) malloc(2 * sizeof *eg[i]);
	}
	m = 0;
	for (h = 0; h < n - 1; h++) {
		scanf("%d%d%d", &i, &j, &u), i--, j--, u--;
		if (u == -1)
			g = -1;
		else
			uu[g = m++] = u;
		append(i, j, g), append(j, i, g);
	}
	dfs1(-1, s, 0, 0);
	dfs2(-1, s, s);
	if (bb[t] == 0) {
		printf("%d\n", dd[t]);
		return 0;
	}
	for (g_ = 0; g_ < m; g_++) {
		d = dist(uu[g_], vv[g_]);
		dds[g_] = dd[uu[g_]] + d;
		for (g = 0; g < m; g++)
			ddd[g][g_] = dist(vv[g], uu[g_]) + d;
	}
	for (g = 0; g < m; g++)
		ddt[g] = dist(vv[g], t);
	for (g = 0; g < m; g++)
		bb_[g] = bb[uu[g]] | bb[vv[g]];
	for (b = 1; b < 1 << m; b++)
		memset(dp[b], 0x3f, m * sizeof *dp[b]);
	for (g = 0; g < m; g++)
		if (bb_[g] == 0)
			dp[1 << g][g] = dds[g];
	ans = INF;
	for (b = 1; b < 1 << m; b++) {
		k = 0;
		for (g = 0; g < m; g++)
			if ((b & 1 << g) == 0 && (bb_[g] & b) == bb_[g])
				gg[k++] = g;
		for (g = 0; g < m; g++) {
			int x = dp[b][g];

			if (x == INF)
				continue;
			if ((bb[t] & b) == bb[t])
				ans = min(ans, x + ddt[g]);
			for (h = 0; h < k; h++) {
				g_ = gg[h];
				dp[b | 1 << g_][g_] = min(dp[b | 1 << g_][g_], x + ddd[g][g_]);
			}
		}
	}
	if (ans == INF)
		ans = -1;
	printf("%d\n", ans);
	return 0;
}

Compilation message

Main.c: In function 'append':
Main.c:19:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   19 |  if (o >= 2 && (o & o - 1) == 0) {
      |                     ~~^~~
Main.c: In function 'main':
Main.c:81:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |  scanf("%d%d%d", &n, &s, &t), s--, t--;
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.c:88:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |   scanf("%d%d%d", &i, &j, &u), i--, j--, u--;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 300 KB Output is correct
3 Correct 55 ms 10824 KB Output is correct
4 Correct 43 ms 10688 KB Output is correct
5 Correct 44 ms 10820 KB Output is correct
6 Correct 39 ms 10808 KB Output is correct
7 Correct 51 ms 10808 KB Output is correct
8 Correct 68 ms 10800 KB Output is correct
9 Correct 40 ms 11052 KB Output is correct
10 Correct 54 ms 10920 KB Output is correct
11 Correct 39 ms 10792 KB Output is correct
12 Correct 43 ms 12892 KB Output is correct
13 Correct 46 ms 12436 KB Output is correct
14 Correct 47 ms 12008 KB Output is correct
15 Correct 60 ms 13152 KB Output is correct
16 Correct 40 ms 13920 KB Output is correct
17 Correct 39 ms 14048 KB Output is correct
18 Correct 45 ms 14556 KB Output is correct
19 Correct 67 ms 19544 KB Output is correct
20 Correct 45 ms 19284 KB Output is correct
21 Correct 45 ms 19008 KB Output is correct
22 Correct 0 ms 340 KB Output is correct
23 Correct 0 ms 340 KB Output is correct
24 Correct 0 ms 340 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Correct 0 ms 296 KB Output is correct

Subtask #2
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 0 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 67 ms 42068 KB Output is correct
6 Correct 68 ms 42188 KB Output is correct
7 Correct 68 ms 42068 KB Output is correct
8 Correct 67 ms 42196 KB Output is correct
9 Correct 67 ms 42184 KB Output is correct
10 Correct 64 ms 42196 KB Output is correct
11 Correct 64 ms 42184 KB Output is correct
12 Correct 64 ms 42200 KB Output is correct
13 Correct 64 ms 42216 KB Output is correct
14 Correct 65 ms 42208 KB Output is correct
15 Correct 66 ms 42196 KB Output is correct
16 Correct 66 ms 42164 KB Output is correct
17 Correct 66 ms 42188 KB Output is correct
18 Correct 78 ms 42372 KB Output is correct
19 Correct 75 ms 42328 KB Output is correct
20 Correct 63 ms 42376 KB Output is correct
21 Correct 74 ms 42404 KB Output is correct
22 Correct 63 ms 42776 KB Output is correct
23 Correct 74 ms 42708 KB Output is correct
24 Correct 64 ms 42712 KB Output is correct
25 Correct 330 ms 82420 KB Output is correct

Subtask #3
41.0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 300 KB Output is correct
3 Correct 55 ms 10824 KB Output is correct
4 Correct 43 ms 10688 KB Output is correct
5 Correct 44 ms 10820 KB Output is correct
6 Correct 39 ms 10808 KB Output is correct
7 Correct 51 ms 10808 KB Output is correct
8 Correct 68 ms 10800 KB Output is correct
9 Correct 40 ms 11052 KB Output is correct
10 Correct 54 ms 10920 KB Output is correct
11 Correct 39 ms 10792 KB Output is correct
12 Correct 43 ms 12892 KB Output is correct
13 Correct 46 ms 12436 KB Output is correct
14 Correct 47 ms 12008 KB Output is correct
15 Correct 60 ms 13152 KB Output is correct
16 Correct 40 ms 13920 KB Output is correct
17 Correct 39 ms 14048 KB Output is correct
18 Correct 45 ms 14556 KB Output is correct
19 Correct 67 ms 19544 KB Output is correct
20 Correct 45 ms 19284 KB Output is correct
21 Correct 45 ms 19008 KB Output is correct
22 Correct 0 ms 340 KB Output is correct
23 Correct 0 ms 340 KB Output is correct
24 Correct 0 ms 340 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Correct 0 ms 296 KB Output is correct
27 Correct 0 ms 340 KB Output is correct
28 Correct 1 ms 296 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 67 ms 42068 KB Output is correct
32 Correct 68 ms 42188 KB Output is correct
33 Correct 68 ms 42068 KB Output is correct
34 Correct 67 ms 42196 KB Output is correct
35 Correct 67 ms 42184 KB Output is correct
36 Correct 64 ms 42196 KB Output is correct
37 Correct 64 ms 42184 KB Output is correct
38 Correct 64 ms 42200 KB Output is correct
39 Correct 64 ms 42216 KB Output is correct
40 Correct 65 ms 42208 KB Output is correct
41 Correct 66 ms 42196 KB Output is correct
42 Correct 66 ms 42164 KB Output is correct
43 Correct 66 ms 42188 KB Output is correct
44 Correct 78 ms 42372 KB Output is correct
45 Correct 75 ms 42328 KB Output is correct
46 Correct 63 ms 42376 KB Output is correct
47 Correct 74 ms 42404 KB Output is correct
48 Correct 63 ms 42776 KB Output is correct
49 Correct 74 ms 42708 KB Output is correct
50 Correct 64 ms 42712 KB Output is correct
51 Correct 330 ms 82420 KB Output is correct
52 Correct 931 ms 108348 KB Output is correct
53 Correct 1025 ms 123764 KB Output is correct
54 Correct 1006 ms 120944 KB Output is correct
55 Correct 997 ms 120364 KB Output is correct
56 Correct 976 ms 121548 KB Output is correct
57 Correct 952 ms 123528 KB Output is correct
58 Correct 0 ms 340 KB Output is correct
59 Correct 0 ms 340 KB Output is correct
60 Correct 0 ms 340 KB Output is correct
61 Correct 963 ms 123924 KB Output is correct
62 Correct 1012 ms 130356 KB Output is correct
63 Correct 1010 ms 125300 KB Output is correct
64 Correct 45 ms 14284 KB Output is correct
65 Correct 43 ms 14648 KB Output is correct
66 Correct 949 ms 123820 KB Output is correct
67 Correct 970 ms 123500 KB Output is correct
68 Correct 987 ms 158940 KB Output is correct
69 Correct 977 ms 159572 KB Output is correct
70 Correct 983 ms 158656 KB Output is correct
71 Correct 1040 ms 158616 KB Output is correct
72 Correct 1004 ms 158656 KB Output is correct
73 Correct 1156 ms 160620 KB Output is correct
74 Correct 1224 ms 161464 KB Output is correct
75 Correct 1057 ms 161172 KB Output is correct
76 Correct 1161 ms 162376 KB Output is correct
77 Correct 1604 ms 160796 KB Output is correct
78 Correct 1050 ms 168400 KB Output is correct
79 Correct 1219 ms 167864 KB Output is correct
80 Correct 1163 ms 166160 KB Output is correct
81 Correct 1140 ms 185788 KB Output is correct
82 Correct 1254 ms 187756 KB Output is correct
83 Correct 1083 ms 187592 KB Output is correct
84 Correct 1108 ms 200916 KB Output is correct
85 Correct 1171 ms 246508 KB Output is correct
86 Correct 1086 ms 245160 KB Output is correct
87 Correct 1357 ms 245296 KB Output is correct