http://poj.org/problem?id=1147
#include"stdio.h"
int a[3001];
int next[3001];
int main()
{
int n,i,j,k=0;
scanf("%d",&n);
for(i=1;i<=n;i++)
{
scanf("%d",&a[i]);
if(!a[i])k++;
}
j=1; k++;
for(i=1;i<=n;i++)
if(a[i])
{ next[k]=i; k++; }
else
{ next[j]=i; j++; }
k=1;
for(i=1;i<=n;i++)
{
k=next[k];
printf("%d ",a[k]);
}
return 0;
}
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