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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#292090#6307. Chase Game 2fstqwq#WA 5ms3636kbC++14554b2023-12-27 17:49:122023-12-27 17:49:12

Judging History

你现在查看的是最新测评结果

  • [2023-12-27 17:49:12]
  • 评测
  • 测评结果：WA
  • 用时：5ms
  • 内存：3636kb
查看
  • [2023-12-27 17:49:12]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
const int N=1e5+5;
int n,in[N];
int main(){
    int T;scanf("%d",&T);
    while(T--){
        scanf("%d",&n);
        memset(in+1,0,sizeof(int)*n);
        for(int i=2;i<=n;i++){
            int x,y;scanf("%d%d",&x,&y);
            in[x]++;in[y]++;
        }
        sort(in+1,in+n+1);
        int ans=0;
        for(int i=1;i<=n;i++)ans+=(in[i]==1);
        if(n<=2 || in[n]==n-1){
            printf("-1\n");
        }
        else printf("%d\n",ans/2+(ans&1));
    }
    return 0;
}
Source code, Language: C++14

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 3624kb

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: 3636kb

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: 5ms
memory: 3624kb

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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