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 ‘print’: user.c:202: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long int’ user.c: In function ‘scmax_main’: user.c:206: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:214: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:218: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result