Compilare: main.cpp: In function 'void dial(int, int)': main.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int pos = 0; pos != bucket[i].size(); ++pos) { ~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:42:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int next = 0; next != G[node].size(); ++next) { ~~~~~^~~~~~~~~~~~~~~~~ main.cpp:35:15: warning: variable 'cost' set but not used [-Wunused-but-set-variable] int node, cost; ^~~~