Compilare: main.cpp: In function 'void bfs(int)': main.cpp:29:19: 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:84:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(; i<s.size(); i++) ~^~~~~~~~~ main.cpp:104:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size(); i++) ~^~~~~~~~~~~