oj.uz

답안 #722703

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
722703 2023-04-12T16:55:50 Z rainboy Winter Driving (CCO19_day1problem3) C
25 / 25
 130 ms 30828 KB 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define N	200000
#define M	36
#define K	(1 << M / 2)

long long max(long long a, long long 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 aa[N], c; long long dp[N], dq[N], sum, sum_;

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

	dp[i] = aa[i], centroid = 1;
	for (o = eo[i]; o--; ) {
		int j = ej[i][o];

		if (j != p) {
			dfs1(i, j);
			dp[i] += dp[j];
			if (dp[j] * 2 > sum)
				centroid = 0;
		}
	}
	if ((sum - dp[i]) * 2 > sum)
		centroid = 0;
	if (centroid)
		c = i;
}

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

	dp[i] = aa[i], dq[i] = 0;
	for (o = eo[i]; o--; ) {
		int j = ej[i][o];

		if (j != p) {
			dfs2(i, j);
			dp[i] += dp[j], dq[i] += dq[j];
		}
	}
	dq[i] += aa[i] * dp[i];
}

void brute(long long *ww, long long *ss, int m) {
	static long long ss_[K];
	int g1, g2, g, h;

	ss[0] = 0;
	for (h = 0; h < m; h++) {
		g1 = 0, g2 = 0, g = 0;
		while (g < (1 << h + 1))
			ss_[g++] = g2 == (1 << h) || g1 < (1 << h) && ss[g1] < ss[g2] + ww[h] ? ss[g1++] : ss[g2++] + ww[h];
		memcpy(ss, ss_, (1 << h + 1) * sizeof *ss_);
	}
}

int main() {
	static long long ww[M], ss1[K], ss2[K];
	int n, m, m1, m2, g1, g2, h, i, j;
	long long ans;

	scanf("%d", &n);
	for (i = 0; i < n; i++)
		ej[i] = (int *) malloc(2 * sizeof *ej[i]);
	for (i = 0; i < n; i++)
		scanf("%d", &aa[i]);
	for (j = 1; j < n; j++) {
		scanf("%d", &i), i--;
		append(i, j), append(j, i);
	}
	for (i = 0; i < n; i++)
		sum += aa[i];
	dfs1(-1, 0);
	dfs2(-1, c);
	m = eo[c], m1 = m / 2, m2 = m - m1;
	for (h = 0; h < m; h++) {
		j = ej[c][h];
		sum_ += ww[h] = dp[j];
	}
	brute(ww, ss1, m1);
	brute(ww + m1, ss2, m2);
	g1 = 0, g2 = (1 << m2) - 1, ans = 0;
	while (g1 < 1 << m1 && g2 >= 0) {
		ans = max(ans, dq[c] + (ss1[g1] + ss2[g2]) * (sum_ - (ss1[g1] + ss2[g2])) - sum);
		if ((ss1[g1] + ss2[g2]) * 2 <= sum_)
			g1++;
		else
			g2--;
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message

Main.c: In function 'append':
Main.c:16:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   16 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
Main.c: In function 'brute':
Main.c:65:22: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   65 |   while (g < (1 << h + 1))
      |                    ~~^~~
Main.c:66:47: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   66 |    ss_[g++] = g2 == (1 << h) || g1 < (1 << h) && ss[g1] < ss[g2] + ww[h] ? ss[g1++] : ss[g2++] + ww[h];
      |                                 ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
Main.c:67:27: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   67 |   memcpy(ss, ss_, (1 << h + 1) * sizeof *ss_);
      |                         ~~^~~
Main.c: In function 'main':
Main.c:76:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
Main.c:80:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~
Main.c:82:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |   scanf("%d", &i), i--;
      |   ^~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 296 KB Output is correct
3 Correct 0 ms 296 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 296 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 340 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 340 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 296 KB Output is correct
18 Correct 1 ms 340 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 300 KB Output is correct
2 Correct 1 ms 340 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 2 ms 280 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 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 428 KB Output is correct
17 Correct 1 ms 468 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 300 KB Output is correct
2 Correct 1 ms 340 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 2 ms 280 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 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 428 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 109 ms 12536 KB Output is correct
19 Correct 86 ms 11452 KB Output is correct
20 Correct 119 ms 12580 KB Output is correct
21 Correct 104 ms 12708 KB Output is correct
22 Correct 106 ms 12656 KB Output is correct
23 Correct 103 ms 12716 KB Output is correct
24 Correct 92 ms 10640 KB Output is correct
25 Correct 79 ms 10700 KB Output is correct
26 Correct 89 ms 10716 KB Output is correct
27 Correct 83 ms 10708 KB Output is correct
28 Correct 130 ms 12012 KB Output is correct
29 Correct 123 ms 13248 KB Output is correct
30 Correct 56 ms 14348 KB Output is correct
31 Correct 66 ms 14300 KB Output is correct
32 Correct 76 ms 14236 KB Output is correct
33 Correct 62 ms 14236 KB Output is correct
34 Correct 57 ms 14288 KB Output is correct
35 Correct 57 ms 14284 KB Output is correct
36 Correct 57 ms 14288 KB Output is correct
37 Correct 59 ms 14248 KB Output is correct
38 Correct 63 ms 28576 KB Output is correct

Subtask #4
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 6436 KB Output is correct
2 Correct 9 ms 6440 KB Output is correct
3 Correct 9 ms 6480 KB Output is correct
4 Correct 10 ms 6480 KB Output is correct
5 Correct 10 ms 6484 KB Output is correct
6 Correct 9 ms 6484 KB Output is correct
7 Correct 10 ms 6484 KB Output is correct
8 Correct 12 ms 6440 KB Output is correct
9 Correct 10 ms 6484 KB Output is correct
10 Correct 14 ms 6484 KB Output is correct
11 Correct 11 ms 6484 KB Output is correct
12 Correct 10 ms 6356 KB Output is correct
13 Correct 9 ms 6436 KB Output is correct
14 Correct 10 ms 6484 KB Output is correct
15 Correct 10 ms 6480 KB Output is correct
16 Correct 9 ms 6484 KB Output is correct
17 Correct 9 ms 6484 KB Output is correct
18 Correct 9 ms 6476 KB Output is correct
19 Correct 10 ms 6484 KB Output is correct
20 Correct 9 ms 6484 KB Output is correct
21 Correct 10 ms 6480 KB Output is correct
22 Correct 11 ms 6440 KB Output is correct
23 Correct 12 ms 6444 KB Output is correct
24 Correct 10 ms 6356 KB Output is correct
25 Correct 10 ms 6484 KB Output is correct
26 Correct 10 ms 6484 KB Output is correct
27 Correct 9 ms 6480 KB Output is correct
28 Correct 9 ms 6484 KB Output is correct

Subtask #5
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 296 KB Output is correct
3 Correct 0 ms 296 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 296 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 340 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 340 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 296 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 300 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 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 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 2 ms 280 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 1 ms 340 KB Output is correct
34 Correct 1 ms 428 KB Output is correct
35 Correct 1 ms 468 KB Output is correct
36 Correct 109 ms 12536 KB Output is correct
37 Correct 86 ms 11452 KB Output is correct
38 Correct 119 ms 12580 KB Output is correct
39 Correct 104 ms 12708 KB Output is correct
40 Correct 106 ms 12656 KB Output is correct
41 Correct 103 ms 12716 KB Output is correct
42 Correct 92 ms 10640 KB Output is correct
43 Correct 79 ms 10700 KB Output is correct
44 Correct 89 ms 10716 KB Output is correct
45 Correct 83 ms 10708 KB Output is correct
46 Correct 130 ms 12012 KB Output is correct
47 Correct 123 ms 13248 KB Output is correct
48 Correct 56 ms 14348 KB Output is correct
49 Correct 66 ms 14300 KB Output is correct
50 Correct 76 ms 14236 KB Output is correct
51 Correct 62 ms 14236 KB Output is correct
52 Correct 57 ms 14288 KB Output is correct
53 Correct 57 ms 14284 KB Output is correct
54 Correct 57 ms 14288 KB Output is correct
55 Correct 59 ms 14248 KB Output is correct
56 Correct 63 ms 28576 KB Output is correct
57 Correct 9 ms 6436 KB Output is correct
58 Correct 9 ms 6440 KB Output is correct
59 Correct 9 ms 6480 KB Output is correct
60 Correct 10 ms 6480 KB Output is correct
61 Correct 10 ms 6484 KB Output is correct
62 Correct 9 ms 6484 KB Output is correct
63 Correct 10 ms 6484 KB Output is correct
64 Correct 12 ms 6440 KB Output is correct
65 Correct 10 ms 6484 KB Output is correct
66 Correct 14 ms 6484 KB Output is correct
67 Correct 11 ms 6484 KB Output is correct
68 Correct 10 ms 6356 KB Output is correct
69 Correct 9 ms 6436 KB Output is correct
70 Correct 10 ms 6484 KB Output is correct
71 Correct 10 ms 6480 KB Output is correct
72 Correct 9 ms 6484 KB Output is correct
73 Correct 9 ms 6484 KB Output is correct
74 Correct 9 ms 6476 KB Output is correct
75 Correct 10 ms 6484 KB Output is correct
76 Correct 9 ms 6484 KB Output is correct
77 Correct 10 ms 6480 KB Output is correct
78 Correct 11 ms 6440 KB Output is correct
79 Correct 12 ms 6444 KB Output is correct
80 Correct 10 ms 6356 KB Output is correct
81 Correct 10 ms 6484 KB Output is correct
82 Correct 10 ms 6484 KB Output is correct
83 Correct 9 ms 6480 KB Output is correct
84 Correct 9 ms 6484 KB Output is correct
85 Correct 110 ms 14372 KB Output is correct
86 Correct 99 ms 12996 KB Output is correct
87 Correct 106 ms 14500 KB Output is correct
88 Correct 129 ms 14424 KB Output is correct
89 Correct 106 ms 14460 KB Output is correct
90 Correct 114 ms 14520 KB Output is correct
91 Correct 96 ms 12164 KB Output is correct
92 Correct 91 ms 12152 KB Output is correct
93 Correct 100 ms 12212 KB Output is correct
94 Correct 85 ms 12204 KB Output is correct
95 Correct 110 ms 13604 KB Output is correct
96 Correct 114 ms 15128 KB Output is correct
97 Correct 72 ms 22196 KB Output is correct
98 Correct 70 ms 22148 KB Output is correct
99 Correct 71 ms 22124 KB Output is correct
100 Correct 73 ms 22188 KB Output is correct
101 Correct 73 ms 22208 KB Output is correct
102 Correct 76 ms 22212 KB Output is correct
103 Correct 70 ms 22216 KB Output is correct
104 Correct 73 ms 22180 KB Output is correct
105 Correct 69 ms 22104 KB Output is correct
106 Correct 72 ms 22164 KB Output is correct
107 Correct 68 ms 22180 KB Output is correct
108 Correct 69 ms 22096 KB Output is correct
109 Correct 70 ms 22188 KB Output is correct
110 Correct 66 ms 22160 KB Output is correct
111 Correct 65 ms 22212 KB Output is correct
112 Correct 64 ms 22224 KB Output is correct
113 Correct 68 ms 30828 KB Output is correct