Compilare: main.c: In function 'main': main.c:5:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("regine.in","r",stdin),freopen("regine.out","w",stdout),scanf("%d",&n),m=2*(n/3),k=1+(n/3),m=(n%3?(m+1):m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:33: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("regine.in","r",stdin),freopen("regine.out","w",stdout),scanf("%d",&n),m=2*(n/3),k=1+(n/3),m=(n%3?(m+1):m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:66: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("regine.in","r",stdin),freopen("regine.out","w",stdout),scanf("%d",&n),m=2*(n/3),k=1+(n/3),m=(n%3?(m+1):m); ^~~~~~~~~~~~~~