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Cod sursa(job #158328)
#include<stdio.h>
int n,p;
int st[30],uz[30];
void back(int k)
{ int ok;
int i;
if(k==p)
{ ok=1;
for(i=0;i<k;i++)
if(st[i]>st[i+1]) {ok=0; break;}
if(ok)
{ for(i=0;i<n;i++) printf("%d ",st[i]);
printf("\n");
}
}
else
{ for(i=1;i<=n;i++)
if(!uz[i])
{ st[k]=i; uz[i]=1;
back(k+1);
uz[i]=0;
}
}
}
int main()
{
freopen("combinari.in","r",stdin);
freopen("combinari.out","w",stdout);
scanf("%d %d",&n,&p);
back(0);
return 0;
}