Compilare: main.cpp: In function 'int main()': main.cpp:101:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (crossed[next] == graph[next].size() - 1) ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:123:36: warning: 'cnt' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << n / 2 << " " << cnt << "\n"; ^~~~