Compilare: user.cpp: In function ‘void dfs1(int)’: user.cpp:42:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a[x].size(); i++) ~^~~~~~~~~~~~ user.cpp: In function ‘void dfs2(int, int)’: user.cpp:62:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a[x].size(); i++) ~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:91:18: warning: ‘mnpoz’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<mnpoz<<" "<<mn; ^~~