Compilare: main.c: In function 'main': main.c:31:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("culmi.in","r",stdin),freopen("culmi.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:31:35: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("culmi.in","r",stdin),freopen("culmi.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:31:67: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("culmi.in","r",stdin),freopen("culmi.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~