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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#292125#6307. Chase Game 2luhanningWA 4ms3504kbC++17530b2023-12-27 19:14:022023-12-27 19:14:03

Judging History

你现在查看的是最新测评结果

  • [2023-12-27 19:14:03]
  • 评测
  • 测评结果：WA
  • 用时：4ms
  • 内存：3504kb
查看
  • [2023-12-27 19:14:02]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
const int N=1e5+10;
LL n,q;
LL d[N],a,b,sum=0;

int main() 
{
	ios::sync_with_stdio(false);cin.tie(nullptr);
	cin>>q;
	while(q--)
	{
		cin>>n;
		sum=0;
		for(int i=1;i<=n;i++)d[i]=0;
		for(int i=1;i<n;i++)
		{
			cin>>a>>b;
			d[a]++;
			d[b]++;
		}
		LL cntt=0;
		for(int i=1;i<=n;i++)
		{
			if(d[i]>1)cntt++;
			else sum++;
		}
		if(cntt<=1)
		{
			cout<<"-1"<<endl;
		}
		else cout<<(sum+1)/2<<endl;
	}
    
    return 0;
}
Source code, Language: C++17

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 3400kb

input:

4
2
1 2
4
1 2
2 3
3 4
4
1 2
2 3
2 4
5
1 2
2 3
3 4
3 5

output:

-1
1
-1
2

result:

ok 4 number(s): "-1 1 -1 2"

Test #2:

score: 0
Accepted
time: 4ms
memory: 3460kb

input:

10000
4
1 2
1 3
3 4
4
1 2
1 3
1 4
4
1 2
2 3
1 4
5
1 2
2 3
1 4
4 5
5
1 2
2 3
3 4
4 5
4
1 2
2 3
2 4
5
1 2
1 3
2 4
2 5
4
1 2
2 3
1 4
5
1 2
1 3
2 4
1 5
5
1 2
2 3
3 4
2 5
5
1 2
1 3
2 4
2 5
4
1 2
1 3
3 4
5
1 2
1 3
3 4
1 5
4
1 2
1 3
1 4
5
1 2
1 3
3 4
3 5
5
1 2
2 3
3 4
3 5
4
1 2
1 3
2 4
5
1 2
2 3
2 4
3 5
5
...

output:

1
-1
1
1
1
-1
2
1
2
2
2
1
2
-1
2
2
1
2
2
1
1
1
-1
2
2
2
1
-1
1
1
2
1
1
-1
1
2
1
1
1
-1
1
1
2
2
2
1
1
1
-1
1
2
1
1
2
1
2
1
1
2
-1
-1
-1
2
2
2
1
1
1
2
2
2
-1
1
2
-1
1
1
-1
2
-1
-1
1
2
2
2
1
1
1
1
1
1
1
1
1
2
-1
1
1
2
-1
2
1
1
1
-1
2
-1
1
-1
-1
2
-1
2
1
2
2
1
1
1
1
2
1
1
1
1
-1
2
1
2
1
1
1
1
1
1
1
2
-1...

result:

ok 10000 numbers

Test #3:

score: -100
Wrong Answer
time: 3ms
memory: 3504kb

input:

10000
9
1 2
2 3
3 4
4 5
1 6
6 7
5 8
7 9
9
1 2
2 3
2 4
1 5
2 6
4 7
6 8
1 9
9
1 2
2 3
1 4
4 5
5 6
4 7
2 8
1 9
10
1 2
2 3
1 4
3 5
3 6
2 7
6 8
6 9
6 10
10
1 2
1 3
3 4
2 5
1 6
5 7
4 8
2 9
7 10
10
1 2
2 3
2 4
1 5
3 6
6 7
5 8
4 9
9 10
9
1 2
2 3
2 4
1 5
3 6
2 7
1 8
2 9
9
1 2
1 3
2 4
1 5
3 6
3 7
7 8
8 9
10
1...

output:

1
3
3
3
2
2
3
2
3
2
3
2
3
2
3
3
3
2
3
2
3
2
3
3
2
2
3
3
3
3
3
3
2
3
3
3
3
3
3
3
2
3
3
3
3
3
2
3
3
3
3
3
3
2
3
2
3
2
2
3
3
4
3
3
3
3
2
2
3
2
2
2
3
3
2
3
3
2
3
3
3
3
2
3
2
2
3
3
3
3
2
3
3
2
3
3
3
3
3
2
3
2
2
3
3
3
3
2
2
3
2
3
4
2
4
3
2
3
3
2
3
2
3
3
3
3
2
2
3
3
3
2
3
3
3
3
3
3
2
3
3
2
2
4
3
3
3
3
2
3
...

result:

wrong answer 37th numbers differ - expected: '4', found: '3'
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