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Cod sursa(job #531078)
#include<iostream.h>
#include<fstream.h>
ofstream h("permutari.out");
ifstream f("permutari.in");
int x[100],n;
void afis(int k)
{int i;
for(i=1;i<=k;i++)
h<<x[i]<<" ";}
int valid(int k)
{int i;
for(i=1;i<k;i++)
if(x[i]==x[k])
return 0;
return 1;}
void back(int k)
{int i;
for(i=1;i<=n;i++)
{x[k]=i;
if(valid(k)==1)
if(k==n)
{afis(k);
h<<endl;}
else
back(k+1);}}
int main()
{f>>n;
back(1);
return 0;}