Compilare: main.cpp: In function 'bool bfs()': main.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void bfs2(int, int)': main.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:79:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[n].size();i++){ ~^~~~~~~~~~~~