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답안 #488553

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
488553 2021-11-19T15:19:23 Z alextodoran Power Plant (JOI20_power) C++17
100 / 100
 174 ms 25140 KB 
/**
 ____ ____ ____ ____ ____
||a |||t |||o |||d |||o ||
||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N_MAX = 200000;

int N;

vector <int> adj[N_MAX + 2];

bool plant[N_MAX + 2];

int down[N_MAX + 2];
int sumDown[N_MAX + 2];

void dfsDown (int u, int parent = -1) {
    for (int v : adj[u]) {
        if (v != parent) {
            dfsDown(v, u);
            sumDown[u] += down[v];
        }
    }
    down[u] = sumDown[u];
    if (plant[u] == true) {
        down[u] = max(sumDown[u] - 1, 1);
    }
}

int up[N_MAX + 2];

void dfsUp (int u, int parent = -1) {
    if (parent != -1) {
        up[u] = up[parent] + sumDown[parent] - down[u];
        if (plant[parent] == true) {
            up[u] = max(up[u] - 1, 1);
        }
    }
    for (int v : adj[u]) {
        if (v != parent) {
            dfsUp(v, u);
        }
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin >> N;
    for (int i = 1; i <= N - 1; i++) {
        int u, v;
        cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }

    string str;
    cin >> str;
    for (int u = 1; u <= N; u++) {
        plant[u] = (str[u - 1] == '1');
    }

    int cntPlants = 0;
    for (int u = 1; u <= N; u++) {
        cntPlants += plant[u];
    }

    dfsDown(1);
    dfsUp(1);

    int answer = min(cntPlants, 2);
    for (int u = 1; u <= N; u++) {
        int full = up[u] + sumDown[u];
        if (plant[u] == true) {
            full = max(full - 1, 1);
        }
        answer = max(answer, full);
    }

    cout << answer << "\n";

    return 0;
}

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4940 KB Output is correct
2 Correct 2 ms 4940 KB Output is correct
3 Correct 2 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 2 ms 4940 KB Output is correct
6 Correct 2 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 2 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 2 ms 4940 KB Output is correct
11 Correct 2 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 2 ms 4940 KB Output is correct
14 Correct 2 ms 4940 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 2 ms 4940 KB Output is correct
17 Correct 4 ms 5008 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 2 ms 4940 KB Output is correct
20 Correct 2 ms 4940 KB Output is correct
21 Correct 2 ms 4940 KB Output is correct

Subtask #2
41.0 / 41.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4940 KB Output is correct
2 Correct 2 ms 4940 KB Output is correct
3 Correct 2 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 2 ms 4940 KB Output is correct
6 Correct 2 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 2 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 2 ms 4940 KB Output is correct
11 Correct 2 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 2 ms 4940 KB Output is correct
14 Correct 2 ms 4940 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 2 ms 4940 KB Output is correct
17 Correct 4 ms 5008 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 2 ms 4940 KB Output is correct
20 Correct 2 ms 4940 KB Output is correct
21 Correct 2 ms 4940 KB Output is correct
22 Correct 3 ms 5068 KB Output is correct
23 Correct 4 ms 5068 KB Output is correct
24 Correct 3 ms 5068 KB Output is correct
25 Correct 3 ms 5068 KB Output is correct
26 Correct 3 ms 5068 KB Output is correct
27 Correct 3 ms 5068 KB Output is correct
28 Correct 3 ms 5068 KB Output is correct
29 Correct 4 ms 5196 KB Output is correct
30 Correct 3 ms 5068 KB Output is correct
31 Correct 3 ms 5068 KB Output is correct
32 Correct 4 ms 5068 KB Output is correct
33 Correct 3 ms 5068 KB Output is correct
34 Correct 4 ms 5068 KB Output is correct
35 Correct 3 ms 5068 KB Output is correct
36 Correct 3 ms 5048 KB Output is correct
37 Correct 3 ms 5068 KB Output is correct
38 Correct 3 ms 5068 KB Output is correct
39 Correct 3 ms 5068 KB Output is correct
40 Correct 3 ms 5068 KB Output is correct
41 Correct 3 ms 5068 KB Output is correct
42 Correct 3 ms 5068 KB Output is correct
43 Correct 4 ms 5060 KB Output is correct
44 Correct 3 ms 5068 KB Output is correct
45 Correct 3 ms 5068 KB Output is correct
46 Correct 3 ms 5040 KB Output is correct
47 Correct 3 ms 5068 KB Output is correct
48 Correct 3 ms 5068 KB Output is correct
49 Correct 3 ms 5068 KB Output is correct
50 Correct 3 ms 5068 KB Output is correct
51 Correct 3 ms 5068 KB Output is correct
52 Correct 3 ms 5068 KB Output is correct
53 Correct 3 ms 5068 KB Output is correct
54 Correct 3 ms 5068 KB Output is correct
55 Correct 3 ms 5068 KB Output is correct
56 Correct 3 ms 5068 KB Output is correct
57 Correct 3 ms 5196 KB Output is correct
58 Correct 3 ms 5068 KB Output is correct
59 Correct 3 ms 5068 KB Output is correct
60 Correct 3 ms 5068 KB Output is correct
61 Correct 3 ms 5068 KB Output is correct
62 Correct 3 ms 5088 KB Output is correct
63 Correct 3 ms 5068 KB Output is correct

Subtask #3
53.0 / 53.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4940 KB Output is correct
2 Correct 2 ms 4940 KB Output is correct
3 Correct 2 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 2 ms 4940 KB Output is correct
6 Correct 2 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 2 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 2 ms 4940 KB Output is correct
11 Correct 2 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 2 ms 4940 KB Output is correct
14 Correct 2 ms 4940 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 2 ms 4940 KB Output is correct
17 Correct 4 ms 5008 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 2 ms 4940 KB Output is correct
20 Correct 2 ms 4940 KB Output is correct
21 Correct 2 ms 4940 KB Output is correct
22 Correct 3 ms 5068 KB Output is correct
23 Correct 4 ms 5068 KB Output is correct
24 Correct 3 ms 5068 KB Output is correct
25 Correct 3 ms 5068 KB Output is correct
26 Correct 3 ms 5068 KB Output is correct
27 Correct 3 ms 5068 KB Output is correct
28 Correct 3 ms 5068 KB Output is correct
29 Correct 4 ms 5196 KB Output is correct
30 Correct 3 ms 5068 KB Output is correct
31 Correct 3 ms 5068 KB Output is correct
32 Correct 4 ms 5068 KB Output is correct
33 Correct 3 ms 5068 KB Output is correct
34 Correct 4 ms 5068 KB Output is correct
35 Correct 3 ms 5068 KB Output is correct
36 Correct 3 ms 5048 KB Output is correct
37 Correct 3 ms 5068 KB Output is correct
38 Correct 3 ms 5068 KB Output is correct
39 Correct 3 ms 5068 KB Output is correct
40 Correct 3 ms 5068 KB Output is correct
41 Correct 3 ms 5068 KB Output is correct
42 Correct 3 ms 5068 KB Output is correct
43 Correct 4 ms 5060 KB Output is correct
44 Correct 3 ms 5068 KB Output is correct
45 Correct 3 ms 5068 KB Output is correct
46 Correct 3 ms 5040 KB Output is correct
47 Correct 3 ms 5068 KB Output is correct
48 Correct 3 ms 5068 KB Output is correct
49 Correct 3 ms 5068 KB Output is correct
50 Correct 3 ms 5068 KB Output is correct
51 Correct 3 ms 5068 KB Output is correct
52 Correct 3 ms 5068 KB Output is correct
53 Correct 3 ms 5068 KB Output is correct
54 Correct 3 ms 5068 KB Output is correct
55 Correct 3 ms 5068 KB Output is correct
56 Correct 3 ms 5068 KB Output is correct
57 Correct 3 ms 5196 KB Output is correct
58 Correct 3 ms 5068 KB Output is correct
59 Correct 3 ms 5068 KB Output is correct
60 Correct 3 ms 5068 KB Output is correct
61 Correct 3 ms 5068 KB Output is correct
62 Correct 3 ms 5088 KB Output is correct
63 Correct 3 ms 5068 KB Output is correct
64 Correct 162 ms 14132 KB Output is correct
65 Correct 144 ms 14316 KB Output is correct
66 Correct 140 ms 14188 KB Output is correct
67 Correct 141 ms 14184 KB Output is correct
68 Correct 138 ms 14160 KB Output is correct
69 Correct 146 ms 14176 KB Output is correct
70 Correct 144 ms 14232 KB Output is correct
71 Correct 139 ms 14232 KB Output is correct
72 Correct 142 ms 14196 KB Output is correct
73 Correct 171 ms 24412 KB Output is correct
74 Correct 170 ms 24192 KB Output is correct
75 Correct 132 ms 14040 KB Output is correct
76 Correct 131 ms 14004 KB Output is correct
77 Correct 149 ms 14100 KB Output is correct
78 Correct 147 ms 14076 KB Output is correct
79 Correct 160 ms 14088 KB Output is correct
80 Correct 150 ms 14060 KB Output is correct
81 Correct 109 ms 14524 KB Output is correct
82 Correct 124 ms 14272 KB Output is correct
83 Correct 158 ms 18184 KB Output is correct
84 Correct 174 ms 20016 KB Output is correct
85 Correct 159 ms 19728 KB Output is correct
86 Correct 143 ms 15308 KB Output is correct
87 Correct 140 ms 14736 KB Output is correct
88 Correct 134 ms 15320 KB Output is correct
89 Correct 134 ms 15324 KB Output is correct
90 Correct 136 ms 15140 KB Output is correct
91 Correct 145 ms 15304 KB Output is correct
92 Correct 133 ms 15552 KB Output is correct
93 Correct 127 ms 17408 KB Output is correct
94 Correct 130 ms 18992 KB Output is correct
95 Correct 128 ms 17724 KB Output is correct
96 Correct 129 ms 16320 KB Output is correct
97 Correct 148 ms 15168 KB Output is correct
98 Correct 127 ms 14752 KB Output is correct
99 Correct 133 ms 14520 KB Output is correct
100 Correct 133 ms 17060 KB Output is correct
101 Correct 132 ms 15488 KB Output is correct
102 Correct 131 ms 14832 KB Output is correct
103 Correct 142 ms 14800 KB Output is correct
104 Correct 70 ms 14108 KB Output is correct
105 Correct 166 ms 21636 KB Output is correct
106 Correct 70 ms 14240 KB Output is correct
107 Correct 81 ms 14288 KB Output is correct
108 Correct 163 ms 24840 KB Output is correct
109 Correct 79 ms 14164 KB Output is correct
110 Correct 169 ms 25140 KB Output is correct
111 Correct 120 ms 14016 KB Output is correct