Compilare: user.cpp: In constructor ‘DisjointSets::DisjointSets(int)’: user.cpp:38:22: warning: ‘DisjointSets::father’ will be initialized after [-Wreorder] vector<int> depth, father; ^ user.cpp:38:15: warning: ‘std::vector<int> DisjointSets::depth’ [-Wreorder] vector<int> depth, father; ^ user.cpp:7:3: warning: when initialized here [-Wreorder] DisjointSets(int N) : father(N), depth(N) { ^ user.cpp: In member function ‘void DisjointSets::join(int, int)’: user.cpp:15:8: warning: unused variable ‘fx’ [-Wunused-variable] int fx = getSet(x); ^ user.cpp:16:8: warning: unused variable ‘fy’ [-Wunused-variable] int fy = getSet(y); ^