Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:24:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<list[nod].size();++i){ ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:53:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<list[nod].size();++i){ ^ user.cpp: In function ‘int main()’: user.cpp:93:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sorted.size();++i){ ^ user.cpp:96:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<list[nod].size();++j){ ^ user.cpp:128:16: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized] dfs2(start); ^