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Cod sursa(job #597393)
#include <stdio.h>
int n,k,st[19],ok[19],okk;
int validare (void)
{
int i;
okk=1;
for (i=2; i<=k && okk; i++) if (st[i]<=st[i-1]) okk=0;
return okk;
}
int back (int p)
{
int i;
if (p==k+1)
{
if (validare())
{
for (i=1; i<=k; i++) printf("%d ", st[i]);
printf("\n");
}
}
else for (i=1; i<=n; i++)
if(ok[i]==0)
{
st[p]=i;
ok[i]=1;
back(p+1);
ok[i]=0;
}
}
int main () {
freopen("combinari.in", "r", stdin);
freopen("combinari.out", "w", stdout);
scanf("%d %d", &n,&k);
back(1);
return 0;
}