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Cod sursa(job #359861)
#include<stdio.h>
FILE *f=fopen("combinari.in","r");
FILE *g=fopen("combinari.out","w");
int n,p,st[20];
int valid(int k)
{
int i;
for(i=1;i<=k-1;i++)
if(st[k]==st[i]) return 0;
if(st[k]<st[k-1] && k>1) return 0;
return 1;
}
void afis()
{
int i;
for(i=1;i<=p;i++)
fprintf(g,"%d ",st[i]);
fprintf(g,"\n");
}
void bkt(int k)
{
int i;
for(i=1;i<=n-p+k;i++)
{
st[k]=i;
if(valid(k)) if(k==p) afis();
else bkt(k+1);
}
}
int main()
{
fscanf(f,"%d%d",&n,&p);
bkt(1);
fclose(f);
fclose(g);
return 0;
}