Compilare: user.c: In function ‘main’: user.c:16:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen( "dreptunghiuri.in" , "r" ,stdin ); ^ user.c:17:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen( "dreptunghiuri.out" , "w" , stdout ); ^ user.c:19:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d" , &n , &m ); ^