Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ^ user.cpp:44:56: warning: variable ‘nod2’ set but not used [-Wunused-but-set-variable] int max1 = -1000000, max2 = -100000, nod1 = -1,nod2 = -1; ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:91:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ^ user.cpp:89:9: warning: unused variable ‘k’ [-Wunused-variable] int k = 0; ^ user.cpp:90:9: warning: unused variable ‘w’ [-Wunused-variable] int w[16005]; ^