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Cod sursa(job #625032)
#include<cstdio>
using namespace std;
int st[100],n,k;
int valid()
{for (int i=1;i<k;i++)
if(st[i]==st[k]) return 0;
return 1;
}
void back()
{int as;
k=1;st[1]=0;
while(k>0)
{ do
{if(st[k]<n)
{as=1;st[k]++;}
else as=0;
}while(as && ! valid());
if(as)
if(k==n)
{for(int i=1;i<=n;i++)
printf("%d ",st[i]);
printf("\n");
}
else{k++; st[k]=0;}
else
k--;
}
}
int main()
{
freopen("permutari.in","r",stdin);
freopen("permutari.out","w",stdout);
scanf("%d",&n);
back();
return 0;
}