Compilare: user.cpp: In function ‘void dfs1(int)’: user.cpp:19:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[nod].size();i++) ^ user.cpp: In function ‘void dfs2(int, int)’: user.cpp:32:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<b[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:85:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<test[i].size();j++) ^ user.cpp:78:9: warning: unused variable ‘cnt’ [-Wunused-variable] int cnt,j; ^