Compilare: user.cpp: In function ‘int solve()’: user.cpp:39:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < curent.size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:22:41: warning: ‘p0.circle::y’ may be used uninitialized in this function [-Wmaybe-uninitialized] return sqrt(1.0 * (a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y)); ^ user.cpp:53:12: note: ‘p0.circle::y’ was declared here circle p0; ^