Compilare: user.cpp: In function ‘void buildPairs()’: user.cpp:41:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[i].size(); j++) ^ user.cpp:47:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[i].size(); j++) ^ user.cpp:49:17: warning: unused variable ‘neighb’ [-Wunused-variable] int neighb = G[i][j].first, c = G[i][j].second; ^ user.cpp: In function ‘void Solve()’: user.cpp:150:17: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int a; ^