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답안 #441197

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
441197 2021-07-04T14:54:50 Z peijar Power Plant (JOI20_power) C++17
100 / 100
 211 ms 25412 KB 
#include <bits/stdc++.h>
#define int long long
using namespace std;

const int MAXN = 2e5;

vector<int> adj[MAXN];
bitset<MAXN> hasPower;
int dp[MAXN][2]; // DP[curNode][onBefore]

int nbSommets;

void dfs(int u, int p) {
  for (int v : adj[u])
    if (v != p)
      dfs(v, u);

  // Put power :
  if (hasPower[u]) {
    dp[u][0] = 1;
    for (int v : adj[u])
      if (v != p)
        dp[u][0] = max(dp[u][0], 1 + dp[v][1]);
    dp[u][1] = 1;
  }
  // Don't put power :
  // Put power in only one place :
  for (int v : adj[u])
    if (v != p) {
      for (int b = 0; b < 2; ++b)
        dp[u][b] = max(dp[u][b], dp[v][b] - (b and hasPower[u]));
    }
  // Or put power in multiple places :
  int tot = 0;
  for (int v : adj[u])
    if (v != p)
      tot += dp[v][1];
  dp[u][0] = max(dp[u][0], tot - hasPower[u]);
  dp[u][1] = max(dp[u][1], tot - hasPower[u]);
}

signed main(void) {
  ios_base::sync_with_stdio(false);
  cin.tie(0);

  cin >> nbSommets;
  for (int i = 1; i < nbSommets; ++i) {
    int u, v;
    cin >> u >> v;
    --u, --v;
    adj[u].push_back(v);
    adj[v].push_back(u);
  }
  for (int i = 0; i < nbSommets; ++i) {
    char c;
    cin >> c;
    hasPower[i] = c == '1';
  }

  dfs(0, 0);
  cout << dp[0][0] << endl;
}

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 5068 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 5012 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 5016 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 3 ms 5020 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 3 ms 5016 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 3 ms 4940 KB Output is correct

Subtask #2
41.0 / 41.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 5068 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 5012 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 5016 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 3 ms 5020 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 3 ms 5016 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 3 ms 4940 KB Output is correct
22 Correct 4 ms 5068 KB Output is correct
23 Correct 4 ms 5068 KB Output is correct
24 Correct 4 ms 5068 KB Output is correct
25 Correct 4 ms 5068 KB Output is correct
26 Correct 4 ms 5068 KB Output is correct
27 Correct 4 ms 5068 KB Output is correct
28 Correct 4 ms 5068 KB Output is correct
29 Correct 4 ms 5196 KB Output is correct
30 Correct 5 ms 5068 KB Output is correct
31 Correct 4 ms 5068 KB Output is correct
32 Correct 5 ms 5068 KB Output is correct
33 Correct 4 ms 5024 KB Output is correct
34 Correct 4 ms 5068 KB Output is correct
35 Correct 4 ms 5068 KB Output is correct
36 Correct 4 ms 5068 KB Output is correct
37 Correct 4 ms 5068 KB Output is correct
38 Correct 4 ms 5088 KB Output is correct
39 Correct 4 ms 5068 KB Output is correct
40 Correct 4 ms 5068 KB Output is correct
41 Correct 4 ms 5068 KB Output is correct
42 Correct 4 ms 5068 KB Output is correct
43 Correct 4 ms 5068 KB Output is correct
44 Correct 5 ms 5068 KB Output is correct
45 Correct 4 ms 5152 KB Output is correct
46 Correct 4 ms 5068 KB Output is correct
47 Correct 4 ms 5156 KB Output is correct
48 Correct 4 ms 5068 KB Output is correct
49 Correct 4 ms 5068 KB Output is correct
50 Correct 5 ms 5068 KB Output is correct
51 Correct 4 ms 5068 KB Output is correct
52 Correct 4 ms 5068 KB Output is correct
53 Correct 4 ms 5068 KB Output is correct
54 Correct 4 ms 5068 KB Output is correct
55 Correct 4 ms 5156 KB Output is correct
56 Correct 4 ms 5068 KB Output is correct
57 Correct 4 ms 5196 KB Output is correct
58 Correct 4 ms 5160 KB Output is correct
59 Correct 4 ms 5156 KB Output is correct
60 Correct 4 ms 5068 KB Output is correct
61 Correct 4 ms 5068 KB Output is correct
62 Correct 4 ms 5196 KB Output is correct
63 Correct 4 ms 5068 KB Output is correct

Subtask #3
53.0 / 53.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 5068 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 5012 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 5016 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 3 ms 5020 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 3 ms 5016 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 3 ms 4940 KB Output is correct
22 Correct 4 ms 5068 KB Output is correct
23 Correct 4 ms 5068 KB Output is correct
24 Correct 4 ms 5068 KB Output is correct
25 Correct 4 ms 5068 KB Output is correct
26 Correct 4 ms 5068 KB Output is correct
27 Correct 4 ms 5068 KB Output is correct
28 Correct 4 ms 5068 KB Output is correct
29 Correct 4 ms 5196 KB Output is correct
30 Correct 5 ms 5068 KB Output is correct
31 Correct 4 ms 5068 KB Output is correct
32 Correct 5 ms 5068 KB Output is correct
33 Correct 4 ms 5024 KB Output is correct
34 Correct 4 ms 5068 KB Output is correct
35 Correct 4 ms 5068 KB Output is correct
36 Correct 4 ms 5068 KB Output is correct
37 Correct 4 ms 5068 KB Output is correct
38 Correct 4 ms 5088 KB Output is correct
39 Correct 4 ms 5068 KB Output is correct
40 Correct 4 ms 5068 KB Output is correct
41 Correct 4 ms 5068 KB Output is correct
42 Correct 4 ms 5068 KB Output is correct
43 Correct 4 ms 5068 KB Output is correct
44 Correct 5 ms 5068 KB Output is correct
45 Correct 4 ms 5152 KB Output is correct
46 Correct 4 ms 5068 KB Output is correct
47 Correct 4 ms 5156 KB Output is correct
48 Correct 4 ms 5068 KB Output is correct
49 Correct 4 ms 5068 KB Output is correct
50 Correct 5 ms 5068 KB Output is correct
51 Correct 4 ms 5068 KB Output is correct
52 Correct 4 ms 5068 KB Output is correct
53 Correct 4 ms 5068 KB Output is correct
54 Correct 4 ms 5068 KB Output is correct
55 Correct 4 ms 5156 KB Output is correct
56 Correct 4 ms 5068 KB Output is correct
57 Correct 4 ms 5196 KB Output is correct
58 Correct 4 ms 5160 KB Output is correct
59 Correct 4 ms 5156 KB Output is correct
60 Correct 4 ms 5068 KB Output is correct
61 Correct 4 ms 5068 KB Output is correct
62 Correct 4 ms 5196 KB Output is correct
63 Correct 4 ms 5068 KB Output is correct
64 Correct 150 ms 18184 KB Output is correct
65 Correct 160 ms 18124 KB Output is correct
66 Correct 181 ms 18172 KB Output is correct
67 Correct 157 ms 18188 KB Output is correct
68 Correct 177 ms 18248 KB Output is correct
69 Correct 178 ms 18208 KB Output is correct
70 Correct 150 ms 18104 KB Output is correct
71 Correct 170 ms 18112 KB Output is correct
72 Correct 168 ms 18292 KB Output is correct
73 Correct 202 ms 24716 KB Output is correct
74 Correct 174 ms 24700 KB Output is correct
75 Correct 159 ms 19396 KB Output is correct
76 Correct 182 ms 19364 KB Output is correct
77 Correct 188 ms 18204 KB Output is correct
78 Correct 201 ms 18156 KB Output is correct
79 Correct 160 ms 18116 KB Output is correct
80 Correct 201 ms 18108 KB Output is correct
81 Correct 145 ms 18104 KB Output is correct
82 Correct 149 ms 18140 KB Output is correct
83 Correct 172 ms 21244 KB Output is correct
84 Correct 211 ms 22424 KB Output is correct
85 Correct 169 ms 22236 KB Output is correct
86 Correct 187 ms 18936 KB Output is correct
87 Correct 195 ms 18628 KB Output is correct
88 Correct 145 ms 18756 KB Output is correct
89 Correct 191 ms 18776 KB Output is correct
90 Correct 178 ms 18628 KB Output is correct
91 Correct 165 ms 18828 KB Output is correct
92 Correct 176 ms 19140 KB Output is correct
93 Correct 153 ms 20068 KB Output is correct
94 Correct 150 ms 21044 KB Output is correct
95 Correct 139 ms 20316 KB Output is correct
96 Correct 156 ms 19328 KB Output is correct
97 Correct 151 ms 18628 KB Output is correct
98 Correct 159 ms 18256 KB Output is correct
99 Correct 150 ms 18300 KB Output is correct
100 Correct 165 ms 20012 KB Output is correct
101 Correct 161 ms 18632 KB Output is correct
102 Correct 134 ms 18372 KB Output is correct
103 Correct 150 ms 18368 KB Output is correct
104 Correct 90 ms 18732 KB Output is correct
105 Correct 167 ms 22864 KB Output is correct
106 Correct 91 ms 18616 KB Output is correct
107 Correct 89 ms 18536 KB Output is correct
108 Correct 165 ms 25212 KB Output is correct
109 Correct 91 ms 18708 KB Output is correct
110 Correct 163 ms 25412 KB Output is correct
111 Correct 140 ms 18236 KB Output is correct