Compilare: main.cpp: In function 'bool bfs()': main.cpp:49:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < edge[nod].size(); i++ ){ ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:153:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < edge[D].size(); i++ ){ ~~^~~~~~~~~~~~~~~~