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Cod sursa(job #466757)
#include<stdio.h>
int a[2001],i,j,s,p,n,st[2001],t=1;
void afis()
{
int i,s=0;
for(i=1;i<=p;i++)
s+=a[st[i]];
if(s%p==0)
{ t=0;
for(i=1;i<=p;i++)
printf("%d ",st[i]);
printf("\n");
}
}
void back(int k)
{
if(t)
{
if(k==p+1)
afis();
else
{
if(k>1) st[k]=st[k-1];
else st[k]=0;
while(st[k]<n-p+k)
{
st[k]++;
back(k+1);
}
}
}
}
int main()
{
freopen("congr.in","r",stdin);
freopen("congr.out","w",stdout);
scanf("%d\n",&p);
n=2*p-1;
for(i=1;i<=n;i++)
scanf("%d",&a[i]);
back(1);
return 0;
}