답안 #297787

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
297787	2020-09-11T23:09:18 Z	eriksuenderhauf	Power Plant (JOI20_power)	C++17	100 / 100	245 ms	25704 KB

power

#include <bits/stdc++.h>
using namespace std;
const int N = 2e5 + 5;
vector<int> adj[N];
int dp[N], rsm[N], sm[N], val[N];

int dfs(int u, int p = -1) {
  dp[u] = -val[u]; // don't cut
  for (int v: adj[u]) if (v != p)
    sm[u] += dfs(v, u);
  return dp[u] = max(-dp[u], dp[u] + sm[u]);
}

void reroot(int u, int p = -1) {
  rsm[u] = sm[u] + (~p ? max(val[p], -val[p] + rsm[p] - dp[u]) : 0);
  dp[u] = max(val[u], rsm[u] - val[u]);
  for (int v: adj[u]) if (v != p)
    reroot(v, u);
}

int main() {
  ios_base::sync_with_stdio(false); cin.tie(0);
  int n; cin >> n;
  for (int i = 1, u, v; i < n; i++) {
    cin >> u >> v; u--, v--;
    adj[u].push_back(v);
    adj[v].push_back(u);
  }
  string s; cin >> s;
  int ans = 0;
  for (int i = 0; i < n; i++)
    ans += val[i] = (s[i] == '1');
  ans = min(ans, 2);
  dfs(0);
  reroot(0);
  for (int i = 0; i < n; i++)
    ans = max(ans, dp[i]);
  cout << ans << "\n";
}

Subtask #1
6.0 / 6.0

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

Subtask #2
41.0 / 41.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	5120 KB	Output is correct
2	Correct	3 ms	4992 KB	Output is correct
3	Correct	4 ms	4992 KB	Output is correct
4	Correct	3 ms	4992 KB	Output is correct
5	Correct	4 ms	5120 KB	Output is correct
6	Correct	4 ms	4992 KB	Output is correct
7	Correct	4 ms	4992 KB	Output is correct
8	Correct	3 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	4 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	3 ms	4992 KB	Output is correct
16	Correct	4 ms	4992 KB	Output is correct
17	Correct	3 ms	4992 KB	Output is correct
18	Correct	4 ms	4992 KB	Output is correct
19	Correct	4 ms	4992 KB	Output is correct
20	Correct	4 ms	5120 KB	Output is correct
21	Correct	4 ms	4992 KB	Output is correct
22	Correct	5 ms	5120 KB	Output is correct
23	Correct	4 ms	5120 KB	Output is correct
24	Correct	4 ms	5120 KB	Output is correct
25	Correct	4 ms	5120 KB	Output is correct
26	Correct	4 ms	5120 KB	Output is correct
27	Correct	5 ms	5120 KB	Output is correct
28	Correct	4 ms	5120 KB	Output is correct
29	Correct	4 ms	5248 KB	Output is correct
30	Correct	5 ms	5248 KB	Output is correct
31	Correct	4 ms	5120 KB	Output is correct
32	Correct	4 ms	5120 KB	Output is correct
33	Correct	5 ms	5120 KB	Output is correct
34	Correct	4 ms	5120 KB	Output is correct
35	Correct	4 ms	5120 KB	Output is correct
36	Correct	5 ms	5120 KB	Output is correct
37	Correct	4 ms	5120 KB	Output is correct
38	Correct	4 ms	5120 KB	Output is correct
39	Correct	5 ms	5248 KB	Output is correct
40	Correct	4 ms	5120 KB	Output is correct
41	Correct	4 ms	5248 KB	Output is correct
42	Correct	5 ms	5120 KB	Output is correct
43	Correct	4 ms	5120 KB	Output is correct
44	Correct	4 ms	5248 KB	Output is correct
45	Correct	4 ms	5120 KB	Output is correct
46	Correct	5 ms	5120 KB	Output is correct
47	Correct	4 ms	5120 KB	Output is correct
48	Correct	5 ms	5376 KB	Output is correct
49	Correct	5 ms	5248 KB	Output is correct
50	Correct	4 ms	5248 KB	Output is correct
51	Correct	5 ms	5120 KB	Output is correct
52	Correct	4 ms	5120 KB	Output is correct
53	Correct	4 ms	5120 KB	Output is correct
54	Correct	4 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	4 ms	5248 KB	Output is correct
58	Correct	4 ms	5120 KB	Output is correct
59	Correct	4 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	5228 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	5120 KB	Output is correct
2	Correct	3 ms	4992 KB	Output is correct
3	Correct	4 ms	4992 KB	Output is correct
4	Correct	3 ms	4992 KB	Output is correct
5	Correct	4 ms	5120 KB	Output is correct
6	Correct	4 ms	4992 KB	Output is correct
7	Correct	4 ms	4992 KB	Output is correct
8	Correct	3 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	4 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	3 ms	4992 KB	Output is correct
16	Correct	4 ms	4992 KB	Output is correct
17	Correct	3 ms	4992 KB	Output is correct
18	Correct	4 ms	4992 KB	Output is correct
19	Correct	4 ms	4992 KB	Output is correct
20	Correct	4 ms	5120 KB	Output is correct
21	Correct	4 ms	4992 KB	Output is correct
22	Correct	5 ms	5120 KB	Output is correct
23	Correct	4 ms	5120 KB	Output is correct
24	Correct	4 ms	5120 KB	Output is correct
25	Correct	4 ms	5120 KB	Output is correct
26	Correct	4 ms	5120 KB	Output is correct
27	Correct	5 ms	5120 KB	Output is correct
28	Correct	4 ms	5120 KB	Output is correct
29	Correct	4 ms	5248 KB	Output is correct
30	Correct	5 ms	5248 KB	Output is correct
31	Correct	4 ms	5120 KB	Output is correct
32	Correct	4 ms	5120 KB	Output is correct
33	Correct	5 ms	5120 KB	Output is correct
34	Correct	4 ms	5120 KB	Output is correct
35	Correct	4 ms	5120 KB	Output is correct
36	Correct	5 ms	5120 KB	Output is correct
37	Correct	4 ms	5120 KB	Output is correct
38	Correct	4 ms	5120 KB	Output is correct
39	Correct	5 ms	5248 KB	Output is correct
40	Correct	4 ms	5120 KB	Output is correct
41	Correct	4 ms	5248 KB	Output is correct
42	Correct	5 ms	5120 KB	Output is correct
43	Correct	4 ms	5120 KB	Output is correct
44	Correct	4 ms	5248 KB	Output is correct
45	Correct	4 ms	5120 KB	Output is correct
46	Correct	5 ms	5120 KB	Output is correct
47	Correct	4 ms	5120 KB	Output is correct
48	Correct	5 ms	5376 KB	Output is correct
49	Correct	5 ms	5248 KB	Output is correct
50	Correct	4 ms	5248 KB	Output is correct
51	Correct	5 ms	5120 KB	Output is correct
52	Correct	4 ms	5120 KB	Output is correct
53	Correct	4 ms	5120 KB	Output is correct
54	Correct	4 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	4 ms	5248 KB	Output is correct
58	Correct	4 ms	5120 KB	Output is correct
59	Correct	4 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	5228 KB	Output is correct
63	Correct	4 ms	5120 KB	Output is correct
64	Correct	209 ms	17636 KB	Output is correct
65	Correct	204 ms	17720 KB	Output is correct
66	Correct	217 ms	17572 KB	Output is correct
67	Correct	200 ms	17592 KB	Output is correct
68	Correct	203 ms	17516 KB	Output is correct
69	Correct	199 ms	17716 KB	Output is correct
70	Correct	201 ms	17708 KB	Output is correct
71	Correct	204 ms	17732 KB	Output is correct
72	Correct	204 ms	17588 KB	Output is correct
73	Correct	240 ms	25144 KB	Output is correct
74	Correct	234 ms	25016 KB	Output is correct
75	Correct	201 ms	17464 KB	Output is correct
76	Correct	203 ms	17476 KB	Output is correct
77	Correct	213 ms	17588 KB	Output is correct
78	Correct	218 ms	17464 KB	Output is correct
79	Correct	211 ms	17472 KB	Output is correct
80	Correct	209 ms	17588 KB	Output is correct
81	Correct	157 ms	17908 KB	Output is correct
82	Correct	182 ms	17656 KB	Output is correct
83	Correct	221 ms	20548 KB	Output is correct
84	Correct	219 ms	21960 KB	Output is correct
85	Correct	217 ms	21700 KB	Output is correct
86	Correct	202 ms	18388 KB	Output is correct
87	Correct	205 ms	17972 KB	Output is correct
88	Correct	186 ms	18548 KB	Output is correct
89	Correct	185 ms	18568 KB	Output is correct
90	Correct	192 ms	18332 KB	Output is correct
91	Correct	188 ms	18520 KB	Output is correct
92	Correct	184 ms	18728 KB	Output is correct
93	Correct	182 ms	19968 KB	Output is correct
94	Correct	175 ms	21100 KB	Output is correct
95	Correct	174 ms	20336 KB	Output is correct
96	Correct	186 ms	19368 KB	Output is correct
97	Correct	195 ms	18328 KB	Output is correct
98	Correct	183 ms	18084 KB	Output is correct
99	Correct	195 ms	18036 KB	Output is correct
100	Correct	184 ms	19876 KB	Output is correct
101	Correct	185 ms	18612 KB	Output is correct
102	Correct	184 ms	18308 KB	Output is correct
103	Correct	197 ms	18136 KB	Output is correct
104	Correct	109 ms	17640 KB	Output is correct
105	Correct	235 ms	23224 KB	Output is correct
106	Correct	106 ms	17512 KB	Output is correct
107	Correct	111 ms	17516 KB	Output is correct
108	Correct	245 ms	25528 KB	Output is correct
109	Correct	106 ms	17644 KB	Output is correct
110	Correct	230 ms	25704 KB	Output is correct
111	Correct	181 ms	17736 KB	Output is correct

답안 #297787

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