Compilare: user.cpp: In member function ‘bool Edge::operator<(const Edge&) const’: user.cpp:15:11: warning: statement has no effect [-Wunused-value] w > e.w; ^ user.cpp:16:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:49:25: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] int dest = ( 1 << k + 1) - 1; ^