Compilare: user.cpp: In function ‘void buildPairs()’: user.cpp:37:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[i].size(); j++) ^ user.cpp:43:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[i].size(); j++) ^ user.cpp:45:17: warning: unused variable ‘neighb’ [-Wunused-variable] int neighb = G[i][j].first, c = G[i][j].second; ^