Compilare: user.cpp: In function ‘int main()’: user.cpp:20:28: warning: ‘true_f’ may be used uninitialized in this function [-Wmaybe-uninitialized] return f < other.f || (f == other.f && x < other.x) || (f == other.f && x == other.x && y < other.y); ^ user.cpp:49:29: note: ‘true_f’ was declared here int true_f, true_x, true_y; ^ user.cpp:20:78: warning: ‘true_x’ may be used uninitialized in this function [-Wmaybe-uninitialized] return f < other.f || (f == other.f && x < other.x) || (f == other.f && x == other.x && y < other.y); ^ user.cpp:49:37: note: ‘true_x’ was declared here int true_f, true_x, true_y; ^