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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#643194#6729. Unrooted TriehewanyingAC ✓314ms21728kbC++141.1kb2024-10-15 19:40:272024-10-15 19:40:28

Judging History

你现在查看的是最新测评结果

  • [2024-10-15 19:40:28]
  • 评测
  • 测评结果:AC
  • 用时:314ms
  • 内存:21728kb
  • [2024-10-15 19:40:27]
  • 提交

answer

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

const int N=2e5+5,inf=1e9;
int n,used[27],ct[N],tot=0,ans=0;
struct Nod{int v,w;};
vector<Nod> G[N];

void NO(){cout<<"0\n",exit(0);}

bool dfs(int u,int fa){
  memset(used,-1,sizeof(used));
  for(auto i:G[u]){
	if(~used[i.w]){
	  if(used[i.w]==inf) return false;
      if(used[i.w]==fa||i.v==fa) ++ct[i.v==fa?used[i.w]:i.v],--ct[u];
      else ++ct[i.v],++ct[used[i.w]],++tot;
	  used[i.w]=inf;
	}else used[i.w]=i.v;
  }

  for(auto i:G[u]) if(i.v!=fa&&!dfs(i.v,u)) return false;
  return true;
}

void getans(int u,int fa){
  if(ct[u]==tot) ++ans;
  for(auto i:G[u]) if(i.v!=fa) ct[i.v]+=ct[u],getans(i.v,u);
}

void SOLVE(){
  cin>>n;ans=tot=0;
  for(int i=1;i<=n;i++) G[i].clear(),ct[i]=0;
  for(int i=1,u,v;i<n;i++){
	char ch;cin>>u>>v>>ch;
	G[u].pb({v,ch-'a'}),G[v].pb({u,ch-'a'});
  }
  if(!dfs(1,0)) return cout<<"0\n",void();
  getans(1,0);cout<<ans<<'\n';
}

int main(){
  ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
  int _;cin>>_;
  while(_--) SOLVE();
  return 0;
}

这程序好像有点Bug,我给组数据试试?

Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 8320kb

input:

2
6
3 1 a
3 2 a
3 4 b
4 5 c
4 6 d
6
3 1 a
3 2 a
3 4 b
5 4 c
6 4 c

output:

2
0

result:

ok 2 number(s): "2 0"

Test #2:

score: 0
Accepted
time: 314ms
memory: 21728kb

input:

1112
19
15 18 a
7 18 c
11 14 b
10 17 b
8 14 a
1 3 b
12 2 a
16 3 c
16 4 b
2 3 a
15 5 a
3 18 d
16 9 a
18 13 b
8 4 b
17 7 a
9 6 a
13 19 a
52
8 32 a
14 51 a
30 52 a
48 36 b
27 39 c
39 51 b
35 15 a
51 52 d
45 51 e
39 26 a
20 12 b
34 18 a
9 12 e
25 5 a
9 13 b
41 51 c
1 52 n
33 14 c
22 30 b
17 4 b
12 52 c
...

output:

15
49
22
68
34
17
28
27
3
4
34
70
37
39
19
24
58
8
16
14
10
73
73
65
35
45
33
81
46
35
78
49
22
13
26
10
33
48
47
3
9
50
8
37
15
84
23
75
26
35
35
61
65
58
30
56
11
8
39
60
88
40
56
17
42
62
12
11
2
59
22
54
14
91
87
1
80
11
45
69
80
33
87
46
56
62
54
80
7
4
48
20
55
19
9
4
38
39
89
35
63
46
24
7
52...

result:

ok 1112 numbers