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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#739285#5357. 芒果冰加了空气ssgzdwx5 92ms3960kbC++141.1kb2024-11-12 21:20:212024-11-12 21:20:22

Judging History

你现在查看的是最新测评结果

  • [2024-11-12 21:20:22]
  • 评测
  • 测评结果:5
  • 用时:92ms
  • 内存:3960kb
  • [2024-11-12 21:20:21]
  • 提交

answer

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

const int N = 5e3 + 5, P = 1e9 + 7;

int n;

vector<int> g[N];

bool v[N];

set<int> merge(set<int> A,set<int> B){
    if (A.size() < B.size()){
        for (int x : A) B.insert(x);
        return B;
    }
    else{
        for (int x : B) A.insert(x);
        return A;
    }
}

set<int> Find(int x,int fa){
    set<int> s;
    s.insert(x);
    for (int y : g[x]){
        if (v[y] || y == fa) continue;
        s = merge(s,Find(y,x));
    }
    return s;
}

int doit(set<int> s){
    if (s.size() == 1) return 1;
    int sum = 0;
    for (int x : s){
        v[x] = 1;
        int mul = 1;
        for (int y : g[x]){
            if (v[y]) continue;
            mul = 1ll * mul * doit(Find(y,x)) % P;
        }
        (sum += mul) %= P;
        v[x] = 0;
    }
    return sum;
}

int main(){
    cin >> n;
    for (int i = 1;i < n;i++){
        int x,y; cin >> x >> y;
        g[x].push_back(y);
        g[y].push_back(x);
    }
    cout << doit(Find(1,0));
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Subtask #1:

score: 5
Accepted

Test #1:

score: 5
Accepted
time: 43ms
memory: 3692kb

input:

10
1 2
2 3
3 4
5 4
6 4
7 4
8 4
9 4
10 4

output:

310862

result:

ok single line: '310862'

Test #2:

score: 5
Accepted
time: 8ms
memory: 3604kb

input:

10
1 2
1 3
2 4
2 5
3 6
3 7
4 8
4 9
8 10

output:

64804

result:

ok single line: '64804'

Test #3:

score: 5
Accepted
time: 37ms
memory: 3916kb

input:

10
1 2
1 3
3 4
3 5
3 6
4 7
3 8
4 9
4 10

output:

258182

result:

ok single line: '258182'

Test #4:

score: 5
Accepted
time: 2ms
memory: 3712kb

input:

10
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10

output:

16796

result:

ok single line: '16796'

Test #5:

score: 5
Accepted
time: 11ms
memory: 3952kb

input:

10
1 2
2 3
3 4
4 5
1 6
2 7
3 8
4 9
5 10

output:

78384

result:

ok single line: '78384'

Test #6:

score: 5
Accepted
time: 5ms
memory: 3720kb

input:

10
1 2
1 3
2 4
3 5
2 6
4 7
3 8
7 9
9 10

output:

38896

result:

ok single line: '38896'

Test #7:

score: 5
Accepted
time: 92ms
memory: 3880kb

input:

10
1 2
2 3
4 3
5 3
6 3
7 3
8 3
9 3
10 3

output:

609656

result:

ok single line: '609656'

Test #8:

score: 5
Accepted
time: 8ms
memory: 3656kb

input:

10
1 2
1 3
2 4
2 5
3 6
3 7
4 8
4 9
9 10

output:

64804

result:

ok single line: '64804'

Test #9:

score: 5
Accepted
time: 16ms
memory: 3728kb

input:

10
1 2
1 3
3 4
3 5
1 6
4 7
1 8
4 9
9 10

output:

118638

result:

ok single line: '118638'

Test #10:

score: 5
Accepted
time: 2ms
memory: 3960kb

input:

10
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
8 10

output:

22438

result:

ok single line: '22438'

Test #11:

score: 5
Accepted
time: 2ms
memory: 3600kb

input:

10
1 2
1 3
2 4
3 5
4 6
5 7
6 8
7 9
8 10

output:

16796

result:

ok single line: '16796'

Test #12:

score: 5
Accepted
time: 11ms
memory: 3656kb

input:

10
1 2
1 3
1 4
3 5
4 6
2 7
3 8
5 9
5 10

output:

82316

result:

ok single line: '82316'

Test #13:

score: 5
Accepted
time: 2ms
memory: 3880kb

input:

8
1 2
3 2
4 2
5 2
6 2
7 2
8 2

output:

13700

result:

ok single line: '13700'

Test #14:

score: 5
Accepted
time: 0ms
memory: 3716kb

input:

8
1 2
1 3
2 4
2 5
3 6
3 7
3 8

output:

3996

result:

ok single line: '3996'

Test #15:

score: 5
Accepted
time: 1ms
memory: 3756kb

input:

8
1 2
2 3
1 4
1 5
1 6
3 7
6 8

output:

3490

result:

ok single line: '3490'

Test #16:

score: 5
Accepted
time: 1ms
memory: 3728kb

input:

8
1 2
2 3
3 4
4 5
5 6
6 7
7 8

output:

1430

result:

ok single line: '1430'

Test #17:

score: 5
Accepted
time: 1ms
memory: 3596kb

input:

8
1 2
1 3
2 4
3 5
4 6
5 7
6 8

output:

1430

result:

ok single line: '1430'

Test #18:

score: 5
Accepted
time: 1ms
memory: 3916kb

input:

8
1 2
2 3
3 4
2 5
3 6
5 7
4 8

output:

3232

result:

ok single line: '3232'

Test #19:

score: 5
Accepted
time: 0ms
memory: 3724kb

input:

8
1 2
2 3
4 3
5 3
6 3
7 3
8 3

output:

8970

result:

ok single line: '8970'

Test #20:

score: 5
Accepted
time: 1ms
memory: 3656kb

input:

8
1 2
1 3
2 4
2 5
3 6
3 7
2 8

output:

3996

result:

ok single line: '3996'

Test #21:

score: 5
Accepted
time: 1ms
memory: 3720kb

input:

8
1 2
1 3
1 4
4 5
3 6
4 7
2 8

output:

3332

result:

ok single line: '3332'

Test #22:

score: 5
Accepted
time: 1ms
memory: 3604kb

input:

8
1 2
2 3
3 4
4 5
5 6
6 7
2 8

output:

1870

result:

ok single line: '1870'

Test #23:

score: 5
Accepted
time: 1ms
memory: 3880kb

input:

8
1 2
2 3
1 4
2 5
3 6
4 7
5 8

output:

2416

result:

ok single line: '2416'

Test #24:

score: 5
Accepted
time: 1ms
memory: 3948kb

input:

8
1 2
1 3
2 4
3 5
2 6
6 7
3 8

output:

2802

result:

ok single line: '2802'

Test #25:

score: 5
Accepted
time: 0ms
memory: 3600kb

input:

3
1 2
2 3

output:

5

result:

ok single line: '5'

Test #26:

score: 5
Accepted
time: 11ms
memory: 3728kb

input:

10
1 2
1 3
1 4
4 5
1 6
6 7
3 8
5 9
2 10

output:

78904

result:

ok single line: '78904'

Subtask #2:

score: 0
Time Limit Exceeded

Test #27:

score: 0
Time Limit Exceeded

input:

5000
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
10 11
11 12
12 13
13 14
14 15
15 16
16 17
17 18
18 19
19 20
20 21
21 22
22 23
23 24
24 25
25 26
26 27
27 28
28 29
29 30
30 31
31 32
32 33
33 34
34 35
35 36
36 37
37 38
38 39
39 40
40 41
41 42
42 43
43 44
44 45
45 46
46 47
47 48
48 49
49 50
50 51
51 52
52 53
...

output:


result:


Subtask #3:

score: 0
Time Limit Exceeded

Dependency #1:

100%
Accepted

Test #37:

score: 0
Time Limit Exceeded

input:

20
1 2
2 3
3 4
1 5
3 6
5 7
5 8
8 9
7 10
10 11
9 12
12 13
10 14
11 15
13 16
16 17
17 18
18 19
16 20

output:


result:


Subtask #4:

score: 0
Skipped

Dependency #3:

0%

Subtask #5:

score: 0
Skipped

Dependency #4:

0%

Subtask #6:

score: 0
Skipped

Dependency #5:

0%