Compilare: main.cpp: In function 'int bfs()': main.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<a[nod].size();i++) { ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<a[N].size();++i) { ~^~~~~~~~~~~~ main.cpp:89:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<solutie.size();i++) { ~^~~~~~~~~~~~~~~