Compilare: user.c: In function ‘queue_remove’: user.c:43:3: warning: statement with no effect [-Wunused-value] *q_tail == NULL; ^ user.c: In function ‘list_add’: user.c:18:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘queue_remove’: user.c:45:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:64:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(infile, "%u %u", &n, &m); ^ user.c:77:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(infile, "%u %u", &u, &v); ^