답안 #292865

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
292865	2020-09-07T14:24:09 Z	luciocf	Power Plant (JOI20_power)	C++14	100 / 100	285 ms	28664 KB

power

#include <bits/stdc++.h>

using namespace std;

const int maxn = 2e5+10;

int tem[maxn];

int dp[maxn];
int soma[maxn];

vector<int> grafo[maxn];

void dfs(int u, int p)
{
	if (tem[u] && p) dp[u] = 2;

	int mx = 0;

	for (auto v: grafo[u])
	{
		if (v == p) continue;

		dfs(v, u);

		mx = max(mx, dp[v]-tem[v]);

		soma[u] += dp[v]-tem[v];
	}

	if (p == 0) dp[u] = max(dp[u], mx);
	else dp[u] = max(dp[u], soma[u]);
}

int ans;

void solve(int u, int p)
{
	if (tem[u]) ans = max(ans, dp[u]+1);

	for (auto v: grafo[u])
	{
		if (v == p) continue;

		int dp_ant = dp[u], soma_ant = soma[u];

		soma[u] -= (dp[v]-tem[v]);

		if (tem[u]) dp[u] = max(2, soma[u]);
		else dp[u] = max(0, soma[u]);

		soma[v] += dp[u]-tem[u];

		if (tem[v])
		{
			dp[v] = 0;
			for (auto w: grafo[v])
				dp[v] = max(dp[v], dp[w]-tem[w]);
		}
		else dp[v] = max(0, soma[v]);

		solve(v, u);

		dp[u] = dp_ant, soma[u] = soma_ant;
	}
}

int main(void)
{
	int n;
	scanf("%d", &n);

	for (int i = 1; i < n; i++)
	{
		int u, v;
		scanf("%d %d", &u, &v);

		grafo[u].push_back(v);
		grafo[v].push_back(u);
	}

	for (int i = 1; i <= n; i++)
	{
		char c;
		scanf(" %c", &c);

		if (c == '1') tem[i] = 1;
	}

	int r = 0;
	for (int i = 1; i <= n; i++)
		if (tem[i])
			r = i;

	dfs(r, 0);
	solve(r, 0);

	printf("%d\n", ans);
}

Compilation message

power.cpp: In function 'int main()':
power.cpp:71:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   71 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
power.cpp:76:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   76 |   scanf("%d %d", &u, &v);
      |   ~~~~~^~~~~~~~~~~~~~~~~
power.cpp:85:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   85 |   scanf(" %c", &c);
      |   ~~~~~^~~~~~~~~~~

Subtask #1
6.0 / 6.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	4992 KB	Output is correct
2	Correct	3 ms	4992 KB	Output is correct
3	Correct	4 ms	4992 KB	Output is correct
4	Correct	4 ms	4992 KB	Output is correct
5	Correct	3 ms	4992 KB	Output is correct
6	Correct	3 ms	4992 KB	Output is correct
7	Correct	4 ms	5120 KB	Output is correct
8	Correct	4 ms	4992 KB	Output is correct
9	Correct	4 ms	4992 KB	Output is correct
10	Correct	4 ms	4992 KB	Output is correct
11	Correct	4 ms	4992 KB	Output is correct
12	Correct	3 ms	4992 KB	Output is correct
13	Correct	3 ms	4992 KB	Output is correct
14	Correct	4 ms	4992 KB	Output is correct
15	Correct	4 ms	4992 KB	Output is correct
16	Correct	4 ms	4992 KB	Output is correct
17	Correct	4 ms	4992 KB	Output is correct
18	Correct	3 ms	4992 KB	Output is correct
19	Correct	3 ms	4992 KB	Output is correct
20	Correct	3 ms	4992 KB	Output is correct
21	Correct	4 ms	5120 KB	Output is correct

Subtask #2
41.0 / 41.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	4992 KB	Output is correct
2	Correct	3 ms	4992 KB	Output is correct
3	Correct	4 ms	4992 KB	Output is correct
4	Correct	4 ms	4992 KB	Output is correct
5	Correct	3 ms	4992 KB	Output is correct
6	Correct	3 ms	4992 KB	Output is correct
7	Correct	4 ms	5120 KB	Output is correct
8	Correct	4 ms	4992 KB	Output is correct
9	Correct	4 ms	4992 KB	Output is correct
10	Correct	4 ms	4992 KB	Output is correct
11	Correct	4 ms	4992 KB	Output is correct
12	Correct	3 ms	4992 KB	Output is correct
13	Correct	3 ms	4992 KB	Output is correct
14	Correct	4 ms	4992 KB	Output is correct
15	Correct	4 ms	4992 KB	Output is correct
16	Correct	4 ms	4992 KB	Output is correct
17	Correct	4 ms	4992 KB	Output is correct
18	Correct	3 ms	4992 KB	Output is correct
19	Correct	3 ms	4992 KB	Output is correct
20	Correct	3 ms	4992 KB	Output is correct
21	Correct	4 ms	5120 KB	Output is correct
22	Correct	5 ms	5120 KB	Output is correct
23	Correct	5 ms	5120 KB	Output is correct
24	Correct	5 ms	5120 KB	Output is correct
25	Correct	5 ms	5120 KB	Output is correct
26	Correct	5 ms	5120 KB	Output is correct
27	Correct	4 ms	5120 KB	Output is correct
28	Correct	5 ms	5120 KB	Output is correct
29	Correct	5 ms	5248 KB	Output is correct
30	Correct	5 ms	5248 KB	Output is correct
31	Correct	5 ms	5120 KB	Output is correct
32	Correct	5 ms	5120 KB	Output is correct
33	Correct	5 ms	5120 KB	Output is correct
34	Correct	5 ms	5120 KB	Output is correct
35	Correct	5 ms	5120 KB	Output is correct
36	Correct	6 ms	5120 KB	Output is correct
37	Correct	5 ms	5120 KB	Output is correct
38	Correct	5 ms	5120 KB	Output is correct
39	Correct	5 ms	5120 KB	Output is correct
40	Correct	5 ms	5120 KB	Output is correct
41	Correct	5 ms	5120 KB	Output is correct
42	Correct	6 ms	5140 KB	Output is correct
43	Correct	5 ms	5120 KB	Output is correct
44	Correct	5 ms	5120 KB	Output is correct
45	Correct	5 ms	5120 KB	Output is correct
46	Correct	5 ms	5120 KB	Output is correct
47	Correct	6 ms	5120 KB	Output is correct
48	Correct	4 ms	5120 KB	Output is correct
49	Correct	5 ms	5120 KB	Output is correct
50	Correct	4 ms	5120 KB	Output is correct
51	Correct	5 ms	5120 KB	Output is correct
52	Correct	5 ms	5120 KB	Output is correct
53	Correct	5 ms	5120 KB	Output is correct
54	Correct	5 ms	5120 KB	Output is correct
55	Correct	5 ms	5120 KB	Output is correct
56	Correct	5 ms	5120 KB	Output is correct
57	Correct	5 ms	5248 KB	Output is correct
58	Correct	4 ms	5120 KB	Output is correct
59	Correct	5 ms	5120 KB	Output is correct
60	Correct	5 ms	5248 KB	Output is correct
61	Correct	4 ms	5120 KB	Output is correct
62	Correct	5 ms	5248 KB	Output is correct
63	Correct	4 ms	5120 KB	Output is correct

Subtask #3
53.0 / 53.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	4992 KB	Output is correct
2	Correct	3 ms	4992 KB	Output is correct
3	Correct	4 ms	4992 KB	Output is correct
4	Correct	4 ms	4992 KB	Output is correct
5	Correct	3 ms	4992 KB	Output is correct
6	Correct	3 ms	4992 KB	Output is correct
7	Correct	4 ms	5120 KB	Output is correct
8	Correct	4 ms	4992 KB	Output is correct
9	Correct	4 ms	4992 KB	Output is correct
10	Correct	4 ms	4992 KB	Output is correct
11	Correct	4 ms	4992 KB	Output is correct
12	Correct	3 ms	4992 KB	Output is correct
13	Correct	3 ms	4992 KB	Output is correct
14	Correct	4 ms	4992 KB	Output is correct
15	Correct	4 ms	4992 KB	Output is correct
16	Correct	4 ms	4992 KB	Output is correct
17	Correct	4 ms	4992 KB	Output is correct
18	Correct	3 ms	4992 KB	Output is correct
19	Correct	3 ms	4992 KB	Output is correct
20	Correct	3 ms	4992 KB	Output is correct
21	Correct	4 ms	5120 KB	Output is correct
22	Correct	5 ms	5120 KB	Output is correct
23	Correct	5 ms	5120 KB	Output is correct
24	Correct	5 ms	5120 KB	Output is correct
25	Correct	5 ms	5120 KB	Output is correct
26	Correct	5 ms	5120 KB	Output is correct
27	Correct	4 ms	5120 KB	Output is correct
28	Correct	5 ms	5120 KB	Output is correct
29	Correct	5 ms	5248 KB	Output is correct
30	Correct	5 ms	5248 KB	Output is correct
31	Correct	5 ms	5120 KB	Output is correct
32	Correct	5 ms	5120 KB	Output is correct
33	Correct	5 ms	5120 KB	Output is correct
34	Correct	5 ms	5120 KB	Output is correct
35	Correct	5 ms	5120 KB	Output is correct
36	Correct	6 ms	5120 KB	Output is correct
37	Correct	5 ms	5120 KB	Output is correct
38	Correct	5 ms	5120 KB	Output is correct
39	Correct	5 ms	5120 KB	Output is correct
40	Correct	5 ms	5120 KB	Output is correct
41	Correct	5 ms	5120 KB	Output is correct
42	Correct	6 ms	5140 KB	Output is correct
43	Correct	5 ms	5120 KB	Output is correct
44	Correct	5 ms	5120 KB	Output is correct
45	Correct	5 ms	5120 KB	Output is correct
46	Correct	5 ms	5120 KB	Output is correct
47	Correct	6 ms	5120 KB	Output is correct
48	Correct	4 ms	5120 KB	Output is correct
49	Correct	5 ms	5120 KB	Output is correct
50	Correct	4 ms	5120 KB	Output is correct
51	Correct	5 ms	5120 KB	Output is correct
52	Correct	5 ms	5120 KB	Output is correct
53	Correct	5 ms	5120 KB	Output is correct
54	Correct	5 ms	5120 KB	Output is correct
55	Correct	5 ms	5120 KB	Output is correct
56	Correct	5 ms	5120 KB	Output is correct
57	Correct	5 ms	5248 KB	Output is correct
58	Correct	4 ms	5120 KB	Output is correct
59	Correct	5 ms	5120 KB	Output is correct
60	Correct	5 ms	5248 KB	Output is correct
61	Correct	4 ms	5120 KB	Output is correct
62	Correct	5 ms	5248 KB	Output is correct
63	Correct	4 ms	5120 KB	Output is correct
64	Correct	247 ms	13676 KB	Output is correct
65	Correct	249 ms	13688 KB	Output is correct
66	Correct	249 ms	13816 KB	Output is correct
67	Correct	237 ms	13688 KB	Output is correct
68	Correct	263 ms	13688 KB	Output is correct
69	Correct	261 ms	13692 KB	Output is correct
70	Correct	241 ms	13688 KB	Output is correct
71	Correct	248 ms	13816 KB	Output is correct
72	Correct	241 ms	12920 KB	Output is correct
73	Correct	280 ms	27640 KB	Output is correct
74	Correct	273 ms	25080 KB	Output is correct
75	Correct	233 ms	13560 KB	Output is correct
76	Correct	251 ms	13560 KB	Output is correct
77	Correct	245 ms	13560 KB	Output is correct
78	Correct	263 ms	13560 KB	Output is correct
79	Correct	243 ms	13808 KB	Output is correct
80	Correct	247 ms	13560 KB	Output is correct
81	Correct	199 ms	14060 KB	Output is correct
82	Correct	233 ms	13940 KB	Output is correct
83	Correct	268 ms	18680 KB	Output is correct
84	Correct	266 ms	18936 KB	Output is correct
85	Correct	263 ms	20600 KB	Output is correct
86	Correct	241 ms	14684 KB	Output is correct
87	Correct	244 ms	15224 KB	Output is correct
88	Correct	237 ms	14748 KB	Output is correct
89	Correct	236 ms	15200 KB	Output is correct
90	Correct	237 ms	14832 KB	Output is correct
91	Correct	233 ms	15096 KB	Output is correct
92	Correct	232 ms	15352 KB	Output is correct
93	Correct	231 ms	20212 KB	Output is correct
94	Correct	211 ms	17956 KB	Output is correct
95	Correct	225 ms	19956 KB	Output is correct
96	Correct	246 ms	17528 KB	Output is correct
97	Correct	221 ms	14904 KB	Output is correct
98	Correct	237 ms	14584 KB	Output is correct
99	Correct	240 ms	14072 KB	Output is correct
100	Correct	226 ms	17272 KB	Output is correct
101	Correct	240 ms	15480 KB	Output is correct
102	Correct	228 ms	14584 KB	Output is correct
103	Correct	240 ms	14328 KB	Output is correct
104	Correct	135 ms	13808 KB	Output is correct
105	Correct	273 ms	28576 KB	Output is correct
106	Correct	136 ms	14440 KB	Output is correct
107	Correct	140 ms	14568 KB	Output is correct
108	Correct	265 ms	28536 KB	Output is correct
109	Correct	130 ms	13672 KB	Output is correct
110	Correct	285 ms	28664 KB	Output is correct
111	Correct	217 ms	13560 KB	Output is correct

답안 #292865

Compilation message

Subtask #1 6.0 / 6.0

Subtask #2 41.0 / 41.0

Subtask #3 53.0 / 53.0

Subtask #1
6.0 / 6.0

Subtask #2
41.0 / 41.0

Subtask #3
53.0 / 53.0