Cod sursa(job #515940)
Utilizator | Bora marian bora_marian | Data | 22 decembrie 2010 18:54:24 |
---|---|---|---|
Problema | Colorare3 | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.51 kb |
#include<fstream>
using namespace std;
int intr[100000],n,k;
long long rez;
int i,j;
int main()
{
ifstream fin("colorare3.in");
ofstream fout("colorare3.out");
fin>>n>>k;
rez=1;
for(i=1;i<n;i++)
{
int a,b;
fin>>a>>b;
intr[a]++;
intr[b]++;
}
for(i=1;i<=n;i++)
{
int c=intr[i];
if(i!=1)
{
c--;
for(int j=c;j>=1;j--)
rez*=k-c-1+j,rez=rez%1000000007;
}
else
for(int j=c;j>=1;j--)
rez*=k-c+j,rez=rez%1000000007;
}
fout<<rez;
return 0;
}