杭电acm 1398 母函数

Square Coins

#include"iostream"
using namespace std;
int c1[310],c2[310];
int main()
{
    int i,j,k,nNum;
    while(scanf("%d",&nNum),nNum)
    {
        for(i=0;i<=nNum;++i)
        {
             c1[i]=1;
             c2[i]=0;                
        }                           
        for(i=2;i*i<=nNum;++i)//注意i和k处有所改动；
        {
             for(j=0;j<=nNum;++j)
                for(k=0;k+j<=nNum;k+=i*i)
                  c2[k+j]+=c1[j];                                
             for(j=0;j<=nNum;++j)
             {
                c1[j]=c2[j];
                c2[j]=0;                   
             }
        }
      printf("%d\n",c1[nNum]);
    }
     return 0;
}