Compilare: main.cpp: In function 'int main()': main.cpp:112:7: warning: unused variable 'x' [-Wunused-variable] int x = v[i].x; ^ main.cpp:113:7: warning: unused variable 'y' [-Wunused-variable] int y = v[i].y; ^ main.cpp: In member function 'bool DisjointSet::union1(int, int)': main.cpp:38:2: warning: control reaches end of non-void function [-Wreturn-type] } ^