# include <cstdio>
# define ll long long
using namespace std;
# define ll long long
using namespace std;
ll dp[100005],ans,odd,even,n;
int main()
{
scanf("%lld",&n);
{
scanf("%lld",&n);
for(int u,v,i = 1;i < n;i++)
{
scanf("%d%d",&u,&v); dp[v] = dp[u]+1;
ans += dp[v]%2?odd++:++even;
}
printf("%lld\n",ans);
return 0;
}
{
scanf("%d%d",&u,&v); dp[v] = dp[u]+1;
ans += dp[v]%2?odd++:++even;
}
printf("%lld\n",ans);
return 0;
}
这代码也能A????
数据也太水了吧,随便一组数据就hack了啊!!!!
10
1 2
1 3
5 1
4 5
5 6
7 3
3 9
8 1
10 2
1 2
1 3
5 1
4 5
5 6
7 3
3 9
8 1
10 2
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