Compilare: main.c: In function 'main': main.c:19:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("perm6.in","r",stdin),freopen("perm6.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:19:35: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("perm6.in","r",stdin),freopen("perm6.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:19:67: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("perm6.in","r",stdin),freopen("perm6.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~