Compilare: user.cpp: In function ‘int main()’: user.cpp:42:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:47:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:63:20: warning: ‘root’ may be used uninitialized in this function [-Wmaybe-uninitialized] fatherDFS(root); ^