Compilare: user.cpp: In function ‘void Cost(int)’: user.cpp:19:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < arb[nod].size(); ++ i) ^ user.cpp: In function ‘int sol(int)’: user.cpp:31:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < arb[nod].size(); ++ i) ^ user.cpp:37:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^