Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:19:33: 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:37:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<L[i].size();j++) { ^ user.cpp:47:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<L[i].size();j++) { ^ user.cpp:122:9: warning: variable ‘last’ set but not used [-Wunused-but-set-variable] int last = m+1; ^