Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:16:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[nod].size(); ++i){ ^ user.cpp: In function ‘void elimin(int, int)’: user.cpp:24:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[u].size(); ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:52:23: warning: unused variable ‘step2’ [-Wunused-variable] int step1 = 0,step2 = 0,zu = 0,yu = 0,xu = 0; ^