Compilare: main.cpp: In function 'int distance(int)': main.cpp:64:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < Ad[nod].size(); ++i ) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:100:32: warning: 'kmin' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << dmin << ' ' << kmin; ^