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Cod sursa(job #430748)
#include<cstdio>
FILE *f=fopen("permutari.in","r"), *g=fopen("permutari.out","w");
int n,stiva[100];
bool ok[10];
void afisare();
bool disp(int);
void back(int x)
{
if(x==n+1)
{
afisare();
return;
}
for(int i=1;i<=n;i++)
{
if(ok[i])
continue;
stiva[x]=i;
ok[i]=true;
back(x+1);
ok[i]=false;
}
}
void afisare()
{
for(int i=1;i<=n;++i)
fprintf(g,"%d ",stiva[i]);
fprintf(g,"\n");
}
bool disp(int x)
{
for(int i=1;i<x;i++)
if (stiva[i]==stiva[x])
return false;
return true;
}
int main()
{
fscanf(f,"%d",&n);
back(1);
}