Problem
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#include<stdio.h>
int main()
{
long int n,a[2000],j,i;
while(scanf("%ld",&n)==1)
{
if(n<0)
break;
i=0;
if(n==0)
printf("0");
while(n!=0)
{
a[i]=n%3;
n=n/3;
i++;
}
for(j=i-1;j>=0;j--)
printf("%ld",a[j]);
printf("\n");
}
return 0;}
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