Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:12:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ^ user.cpp: In function ‘void bfsBlack(int)’: user.cpp:35:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ^ user.cpp:43:25: warning: unused variable ‘act’ [-Wunused-variable] int act=1; ^