Compilare: main.cpp: In function 'int bfs()': main.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<L[nod].size(); i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:52:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<L[101].size(); i++){ ~^~~~~~~~~~~~~~