답안 #294117

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
294117	2020-09-08T15:37:16 Z	BThero	Power Plant (JOI20_power)	C++17	100 / 100	311 ms	43384 KB

power

// chrono::system_clock::now().time_since_epoch().count()
#include<bits/stdc++.h>

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define debug(x) cerr << #x << " = " << x << endl;

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

const int MAXN = (int)2e5 + 5;

vector<int> adj[MAXN];
char can[MAXN];
int dp[MAXN], dpUp[MAXN];
int n, ans;

void dfs(int v, int pr = -1) {
  int S = 0;

  for (int to : adj[v]) {
    if (to != pr) {
      dfs(to, v);
      S += dp[to];
    }
  }
  
  if (can[v] == '1') {
    dp[v] = max(1, S - 1);
  }
  else {
    dp[v] = S;
  }
}

void dfs2(int v, int pr = -1) {
  int S = dpUp[v];
  vector<int> sons;

  for (int to : adj[v]) {
    if (to != pr) {
      sons.pb(to);
      S += dp[to];
    }
  }
  
  if (can[v] == '1') {
    ans = max(ans, max(1, S - 1));
  }
  else {
    ans = max(ans, S);
  }
  
  for (int to : sons) {
    S -= dp[to];
    
    if (can[v] == '1') {
      dpUp[to] = max(1, S - 1);
    }
    else {
      dpUp[to] = S;
    }
    
    dfs2(to, v);
    S += dp[to];
  }
}

void solve() {
  scanf("%d", &n);
  
  for (int i = 1; i < n; ++i) {
    int u, v;
    scanf("%d %d", &u, &v);
    adj[u].pb(v);
    adj[v].pb(u);
  }
  
  scanf("%s", can + 1);
  ans = 0;
  
  for (int i = 1; i <= n; ++i) {
    if (can[i] == '1') {
      ans++;
    }
  }
  
  ans = min(ans, 2);
  dfs(1);
  dfs2(1);  
  printf("%d\n", ans);
}

int main() {
  int tt = 1;
  
  while (tt--) {
    solve();
  }

  return 0;
}

Compilation message

power.cpp: In function 'void solve()':
power.cpp:76:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   76 |   scanf("%d", &n);
      |   ~~~~~^~~~~~~~~~
power.cpp:80:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   80 |     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("%s", can + 1);
      |   ~~~~~^~~~~~~~~~~~~~~

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	5024 KB	Output is correct
5	Correct	4 ms	5024 KB	Output is correct
6	Correct	4 ms	4992 KB	Output is correct
7	Correct	4 ms	4992 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	4 ms	4992 KB	Output is correct
13	Correct	4 ms	4992 KB	Output is correct
14	Correct	5 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	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	4992 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	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	5024 KB	Output is correct
5	Correct	4 ms	5024 KB	Output is correct
6	Correct	4 ms	4992 KB	Output is correct
7	Correct	4 ms	4992 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	4 ms	4992 KB	Output is correct
13	Correct	4 ms	4992 KB	Output is correct
14	Correct	5 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	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	4992 KB	Output is correct
21	Correct	4 ms	4992 KB	Output is correct
22	Correct	5 ms	5120 KB	Output is correct
23	Correct	5 ms	5248 KB	Output is correct
24	Correct	6 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	5 ms	5120 KB	Output is correct
28	Correct	5 ms	5120 KB	Output is correct
29	Correct	5 ms	5376 KB	Output is correct
30	Correct	6 ms	5248 KB	Output is correct
31	Correct	5 ms	5152 KB	Output is correct
32	Correct	5 ms	5120 KB	Output is correct
33	Correct	6 ms	5148 KB	Output is correct
34	Correct	5 ms	5120 KB	Output is correct
35	Correct	5 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	5 ms	5120 KB	Output is correct
39	Correct	5 ms	5344 KB	Output is correct
40	Correct	5 ms	5248 KB	Output is correct
41	Correct	5 ms	5248 KB	Output is correct
42	Correct	5 ms	5120 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	5 ms	5120 KB	Output is correct
48	Correct	5 ms	5248 KB	Output is correct
49	Correct	5 ms	5248 KB	Output is correct
50	Correct	5 ms	5248 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	4 ms	5120 KB	Output is correct
57	Correct	6 ms	5376 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	5376 KB	Output is correct
63	Correct	5 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	5024 KB	Output is correct
5	Correct	4 ms	5024 KB	Output is correct
6	Correct	4 ms	4992 KB	Output is correct
7	Correct	4 ms	4992 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	4 ms	4992 KB	Output is correct
13	Correct	4 ms	4992 KB	Output is correct
14	Correct	5 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	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	4992 KB	Output is correct
21	Correct	4 ms	4992 KB	Output is correct
22	Correct	5 ms	5120 KB	Output is correct
23	Correct	5 ms	5248 KB	Output is correct
24	Correct	6 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	5 ms	5120 KB	Output is correct
28	Correct	5 ms	5120 KB	Output is correct
29	Correct	5 ms	5376 KB	Output is correct
30	Correct	6 ms	5248 KB	Output is correct
31	Correct	5 ms	5152 KB	Output is correct
32	Correct	5 ms	5120 KB	Output is correct
33	Correct	6 ms	5148 KB	Output is correct
34	Correct	5 ms	5120 KB	Output is correct
35	Correct	5 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	5 ms	5120 KB	Output is correct
39	Correct	5 ms	5344 KB	Output is correct
40	Correct	5 ms	5248 KB	Output is correct
41	Correct	5 ms	5248 KB	Output is correct
42	Correct	5 ms	5120 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	5 ms	5120 KB	Output is correct
48	Correct	5 ms	5248 KB	Output is correct
49	Correct	5 ms	5248 KB	Output is correct
50	Correct	5 ms	5248 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	4 ms	5120 KB	Output is correct
57	Correct	6 ms	5376 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	5376 KB	Output is correct
63	Correct	5 ms	5120 KB	Output is correct
64	Correct	250 ms	15868 KB	Output is correct
65	Correct	258 ms	16120 KB	Output is correct
66	Correct	294 ms	15992 KB	Output is correct
67	Correct	233 ms	15864 KB	Output is correct
68	Correct	241 ms	16120 KB	Output is correct
69	Correct	236 ms	15864 KB	Output is correct
70	Correct	247 ms	15992 KB	Output is correct
71	Correct	250 ms	15992 KB	Output is correct
72	Correct	236 ms	15864 KB	Output is correct
73	Correct	311 ms	41468 KB	Output is correct
74	Correct	282 ms	41080 KB	Output is correct
75	Correct	235 ms	15992 KB	Output is correct
76	Correct	234 ms	15864 KB	Output is correct
77	Correct	258 ms	15736 KB	Output is correct
78	Correct	256 ms	15992 KB	Output is correct
79	Correct	247 ms	15736 KB	Output is correct
80	Correct	251 ms	15864 KB	Output is correct
81	Correct	196 ms	16624 KB	Output is correct
82	Correct	227 ms	16372 KB	Output is correct
83	Correct	273 ms	26232 KB	Output is correct
84	Correct	269 ms	30456 KB	Output is correct
85	Correct	271 ms	29944 KB	Output is correct
86	Correct	247 ms	18552 KB	Output is correct
87	Correct	257 ms	17400 KB	Output is correct
88	Correct	236 ms	18040 KB	Output is correct
89	Correct	223 ms	17880 KB	Output is correct
90	Correct	226 ms	17448 KB	Output is correct
91	Correct	228 ms	18164 KB	Output is correct
92	Correct	223 ms	18644 KB	Output is correct
93	Correct	221 ms	24016 KB	Output is correct
94	Correct	231 ms	27048 KB	Output is correct
95	Correct	214 ms	24604 KB	Output is correct
96	Correct	215 ms	20840 KB	Output is correct
97	Correct	218 ms	17620 KB	Output is correct
98	Correct	217 ms	16504 KB	Output is correct
99	Correct	223 ms	16376 KB	Output is correct
100	Correct	224 ms	22904 KB	Output is correct
101	Correct	225 ms	18620 KB	Output is correct
102	Correct	227 ms	17144 KB	Output is correct
103	Correct	230 ms	16504 KB	Output is correct
104	Correct	120 ms	17512 KB	Output is correct
105	Correct	286 ms	34936 KB	Output is correct
106	Correct	124 ms	17384 KB	Output is correct
107	Correct	121 ms	17384 KB	Output is correct
108	Correct	282 ms	42872 KB	Output is correct
109	Correct	124 ms	17512 KB	Output is correct
110	Correct	276 ms	43384 KB	Output is correct
111	Correct	220 ms	15992 KB	Output is correct

답안 #294117

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