Compilare: user.cpp: In function ‘int Union(int, int)’: user.cpp:73:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void kruskal(int, int)’: user.cpp:101:17: warning: unused variable ‘temp’ [-Wunused-variable] int temp = 2; ^ user.cpp:118:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < min_span.size() ; ++i) ^ user.cpp: In function ‘int main()’: user.cpp:126:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^