Compilare: user.c: In function ‘sitrling_main’: user.c:11: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:30: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:34: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c: In function ‘union_find_main’: user.c:94: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:95: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:99: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:106: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c: In function ‘evaluare_main’: user.c:171: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:172: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:174: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result user.c: In function ‘scmax_main’: user.c:198: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:199: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:206: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:211: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result