Compilare: main.cpp: In function 'void bfs1()': main.cpp:41:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for(int i=0; i<dragons.size(); i++){ | ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:121:9: warning: unused variable 'color' [-Wunused-variable] 121 | int color; | ^~~~~