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Cod sursa(job #979532)
#include<iostream>
using namespace std;
int sol[100],n;
int valid(int k)
{
for(int i=1;i<k;i++)
if(sol[k]==sol[i]) return 0;
return 1;
}
int back(int k)
{
int i;
if(k==n+1)
{for(i=1;i<=n;i++)
cout<<sol[i];
cout<<endl;
}
else
{sol[k]=0;
for(i=1;i<=n;i++)
{sol[k]=i;
if(valid(k))
back(k+1);
}
}
}
int main()
{
cout<<"n=";cin>>n;
back(1);
}