Compilare: user.cpp: In function ‘void init(int)’: user.cpp:37:10: warning: unused variable ‘t’ [-Wunused-variable] int i,j,t; ^ user.cpp: In function ‘void dfs(int, int)’: user.cpp:46:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (t=0; t<A[nod].size(); t++) ^ user.cpp:57:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (t=0; t<A[nod].size(); t++) ^