답안 #293711

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
293711	2020-09-08T10:09:12 Z	arman_ferdous	Power Plant (JOI20_power)	C++17	100 / 100	243 ms	26872 KB

power

#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define pb push_back
#define sz(v) (int)v.size()
#define all(v) v.begin(),v.end()
#define dbg(x) cerr << #x << " is " << x << "\n";

using ll = long long;
using ii = pair<ll,ll>;

const int N = 2e5+10;

int n;
vector<int> g[N];
char s[N];

int dp[2][N];

void solve(int u, int f) {
  int childcnt = 0;
  for(int v : g[u]) if(v != f) {
    childcnt++;
    solve(v, u);
  }
  if(childcnt == 0) {
    dp[0][u] = dp[1][u] = (s[u] == '1');
    return;
  }
  if(s[u] == '0') {
    dp[0][u] = 0;
    for(int v : g[u]) if(v != f)
      dp[0][u] = max(dp[0][u], dp[0][v]);
    dp[1][u] = 0;
    for(int v : g[u]) if(v != f)
      dp[1][u] += dp[1][v];
  }
  else {
    int on = 1, off = 0;

    off = 0;
    for(int v : g[u]) if(v != f)
      off = max(off, dp[0][v]);

    for(int v : g[u]) if(v != f)
      on = max(on, dp[1][v] + 1);
    dp[0][u] = max(on, off);

    dp[1][u] = -1;
    for(int v : g[u]) if(v != f)
      dp[1][u] += dp[1][v];
    dp[1][u] = max(1, dp[1][u]);
  }
}

int main() {
  scanf("%d", &n);
  for(int i = 1; i < n; i++) {
    int u, v; scanf("%d %d", &u, &v);
    g[u].push_back(v);
    g[v].push_back(u);
  }
  scanf(" %s", s + 1);
  solve(1, 0);
  printf("%d\n", max(dp[0][1], dp[1][1]));
  return 0;
}

Compilation message

power.cpp: In function 'int main()':
power.cpp:59:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   59 |   scanf("%d", &n);
      |   ~~~~~^~~~~~~~~~
power.cpp:61:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   61 |     int u, v; scanf("%d %d", &u, &v);
      |               ~~~~~^~~~~~~~~~~~~~~~~
power.cpp:65:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   65 |   scanf(" %s", s + 1);
      |   ~~~~~^~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	4992 KB	Output is correct
2	Correct	4 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	4 ms	4992 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	4 ms	4992 KB	Output is correct
14	Correct	4 ms	4992 KB	Output is correct
15	Correct	5 ms	4992 KB	Output is correct
16	Correct	3 ms	4992 KB	Output is correct
17	Correct	4 ms	4992 KB	Output is correct
18	Correct	4 ms	4968 KB	Output is correct
19	Correct	4 ms	4992 KB	Output is correct
20	Correct	4 ms	4968 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	4 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	4 ms	4992 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	4 ms	4992 KB	Output is correct
14	Correct	4 ms	4992 KB	Output is correct
15	Correct	5 ms	4992 KB	Output is correct
16	Correct	3 ms	4992 KB	Output is correct
17	Correct	4 ms	4992 KB	Output is correct
18	Correct	4 ms	4968 KB	Output is correct
19	Correct	4 ms	4992 KB	Output is correct
20	Correct	4 ms	4968 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	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	5 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	4 ms	5120 KB	Output is correct
33	Correct	4 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	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	5120 KB	Output is correct
40	Correct	5 ms	5096 KB	Output is correct
41	Correct	5 ms	5120 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	6 ms	5120 KB	Output is correct
47	Correct	5 ms	5120 KB	Output is correct
48	Correct	5 ms	5120 KB	Output is correct
49	Correct	4 ms	5120 KB	Output is correct
50	Correct	5 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	4 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	4 ms	5120 KB	Output is correct
60	Correct	5 ms	5120 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	4 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	4 ms	4992 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	4 ms	4992 KB	Output is correct
14	Correct	4 ms	4992 KB	Output is correct
15	Correct	5 ms	4992 KB	Output is correct
16	Correct	3 ms	4992 KB	Output is correct
17	Correct	4 ms	4992 KB	Output is correct
18	Correct	4 ms	4968 KB	Output is correct
19	Correct	4 ms	4992 KB	Output is correct
20	Correct	4 ms	4968 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	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	5 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	4 ms	5120 KB	Output is correct
33	Correct	4 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	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	5120 KB	Output is correct
40	Correct	5 ms	5096 KB	Output is correct
41	Correct	5 ms	5120 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	6 ms	5120 KB	Output is correct
47	Correct	5 ms	5120 KB	Output is correct
48	Correct	5 ms	5120 KB	Output is correct
49	Correct	4 ms	5120 KB	Output is correct
50	Correct	5 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	4 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	4 ms	5120 KB	Output is correct
60	Correct	5 ms	5120 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	216 ms	13300 KB	Output is correct
65	Correct	200 ms	13160 KB	Output is correct
66	Correct	203 ms	13132 KB	Output is correct
67	Correct	201 ms	13256 KB	Output is correct
68	Correct	221 ms	13176 KB	Output is correct
69	Correct	207 ms	13176 KB	Output is correct
70	Correct	195 ms	13176 KB	Output is correct
71	Correct	205 ms	13176 KB	Output is correct
72	Correct	203 ms	13076 KB	Output is correct
73	Correct	243 ms	25720 KB	Output is correct
74	Correct	237 ms	25720 KB	Output is correct
75	Correct	192 ms	13048 KB	Output is correct
76	Correct	208 ms	13048 KB	Output is correct
77	Correct	220 ms	13048 KB	Output is correct
78	Correct	203 ms	13084 KB	Output is correct
79	Correct	201 ms	13048 KB	Output is correct
80	Correct	205 ms	13052 KB	Output is correct
81	Correct	184 ms	13444 KB	Output is correct
82	Correct	182 ms	13208 KB	Output is correct
83	Correct	213 ms	18296 KB	Output is correct
84	Correct	228 ms	20368 KB	Output is correct
85	Correct	210 ms	20116 KB	Output is correct
86	Correct	213 ms	14584 KB	Output is correct
87	Correct	199 ms	13940 KB	Output is correct
88	Correct	192 ms	14404 KB	Output is correct
89	Correct	195 ms	14432 KB	Output is correct
90	Correct	189 ms	14140 KB	Output is correct
91	Correct	192 ms	14324 KB	Output is correct
92	Correct	190 ms	14716 KB	Output is correct
93	Correct	194 ms	17140 KB	Output is correct
94	Correct	181 ms	18800 KB	Output is correct
95	Correct	174 ms	17520 KB	Output is correct
96	Correct	186 ms	15736 KB	Output is correct
97	Correct	193 ms	14196 KB	Output is correct
98	Correct	184 ms	13776 KB	Output is correct
99	Correct	195 ms	13620 KB	Output is correct
100	Correct	192 ms	16632 KB	Output is correct
101	Correct	198 ms	14688 KB	Output is correct
102	Correct	179 ms	13880 KB	Output is correct
103	Correct	199 ms	13764 KB	Output is correct
104	Correct	121 ms	13800 KB	Output is correct
105	Correct	219 ms	22520 KB	Output is correct
106	Correct	116 ms	13836 KB	Output is correct
107	Correct	123 ms	13880 KB	Output is correct
108	Correct	225 ms	26620 KB	Output is correct
109	Correct	123 ms	13812 KB	Output is correct
110	Correct	230 ms	26872 KB	Output is correct
111	Correct	182 ms	13132 KB	Output is correct

답안 #293711

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