Compilare: user.cpp: In function ‘void make_apm()’: user.cpp:50:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[u.val].size(); i++) { ^ user.cpp: In function ‘void process_edge(const int&, const int&, const int&)’: user.cpp:85:9: warning: variable ‘flag’ set but not used [-Wunused-but-set-variable] int flag = 0, cost = -1, found = 0, pc; ^