hdu 1398 Square Coins

#include<stdio.h>
#include<string.h>
int main(){
    int c1[310],c2[310];
    int n,i,j,k;
    while(scanf("%d",&n),n){
        for(i=0;i<=n;i++){
            c1[i]=1;
            c2[i]=0;
        }
        for(i=2;i*i<=n;i++){
            for(j=0;j<=n;j++){
                for(k=0;k+j<=n;k+=i*i)
                c2[j+k]+=c1[j];
            }
            for(j=0;j<=n;j++){
                c1[j]=c2[j];
                c2[j]=0;
            }
        }
        printf("%d\n",c1[n]);
    }
    return 0;
}