Compilare: main.c: In function 'main': main.c:18:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("rucsac.in","r",stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:19:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("rucsac.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:20:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~ main.c:30:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&g,&p); ^~~~~~~~~~~~~~~~~~~