Compilare: main.cpp: In function 'void bfs()': main.cpp:51:6: warning: variable 'stopx' set but not used [-Wunused-but-set-variable] int stopx, stopy; ^~~~~ main.cpp:51:13: warning: variable 'stopy' set but not used [-Wunused-but-set-variable] int stopx, stopy; ^~~~~ main.cpp: In function 'int main()': main.cpp:86:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < n; i++) ~~^~~ main.cpp:88:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < m; j++) ~~^~~