Compilare: user.cpp: In function ‘void solve()’: user.cpp:23:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[nod].size(); i++){ ^ user.cpp:16:9: warning: variable ‘cost’ set but not used [-Wunused-but-set-variable] int cost,nod; ^ user.cpp: In function ‘int main()’: user.cpp:49:10: warning: statement is a reference, not call, to function ‘solve’ [-Waddress] solve; ^ user.cpp:49:10: warning: statement has no effect [-Wunused-value]