Compilare: main.cpp: In function 'int main()': main.cpp:42:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<A[j].size();++k) ///parcurg lista vecinilor lui k ~^~~~~~~~~~~~ main.cpp:51:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A[0].size();++i) ~^~~~~~~~~~~~