Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[x].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:47:19: 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:66:16: warning: 'sol' may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<sol<<" "<<vmin; ^~~