hdu-2501-Bitset

#include<stdio.h>
int a[12];
int main()
{
int n,i,j;
while(scanf("%d",&n)!=EOF)
{
j=0;
while(n)
{
a[j++]=n%2;
n/=2;
}
for(i=j-1;i>=0;i--)
printf("%d",a[i]);
printf("\n");
}
return 0;
}