Compilare: user.cpp: In function ‘int DFS(int, int)’: user.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size() ; i++) ~~^~~~~~~~~~~~~~~ user.cpp:25:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[nod].size(); i++) ~~^~~~~~~~~~~~~~~ user.cpp:42:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:67:6: warning: unused variable ‘nr’ [-Wunused-variable] int nr = 1; ^~ user.cpp:64:13: warning: ‘nod’ may be used uninitialized in this function [-Wmaybe-uninitialized] DFS(nod, 1); ^