Gee_Zer的博客

根据组合数递推公式C(n,m)=C(m−1,n−1)+C(m,n−1)； 很容易得到以下代表的代码，m<=10000 LL C[Max][Max]; void Compare_C(){ C[0][0]=1; for(int i=1;i<Max;i++){ C[i][0]=C[i][i]=1; for(int j=1;j<=i;j++...

D - Blue and Red Balls Time Limit: 2 sec / Memory Limit: 1024 MB Score : 400 points Problem Statement There are K blue balls and N−K red balls. The balls of the same color cannot be distinguished. Snu...