Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:52:15: warning: 'poz' may be used uninitialized in this function [-Wmaybe-uninitialized] dfs(poz,1); ^