Compilare: user.c: In function ‘main’: user.c:142:29: warning: unused variable ‘l2’ [-Wunused-variable] int n, m, q, k, i, j, l1, l2; ^ user.c:142:25: warning: unused variable ‘l1’ [-Wunused-variable] int n, m, q, k, i, j, l1, l2; ^ user.c: In function ‘getch’: user.c:21:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, (1 << BUFF), in); ^