Compilare: main.cpp: In function 'bool bfs()': main.cpp:33:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[node].size(); ++ i) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:78:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[n + 1].size(); ++ i) ~~^~~~~~~~~~~~~~~~~ main.cpp:98:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < G[i].size(); ++ j) ~~^~~~~~~~~~~~~