Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:21:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ;i < L[nod].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:59:20: warning: unused variable ‘i2’ [-Wunused-variable] int d = 0, i2 = 0; ^ user.cpp:60:13: warning: unused variable ‘start’ [-Wunused-variable] int start = 0; ^ user.cpp:61:13: warning: unused variable ‘finish’ [-Wunused-variable] int finish = 0; ^