Compilare: main.cpp: In function 'void bfs()': main.cpp:37:7: warning: unused variable 'vecin' [-Wunused-variable] int vecin, last; ^~~~~ main.cpp:37:14: warning: unused variable 'last' [-Wunused-variable] int vecin, last; ^~~~ main.cpp: In function 'int main()': main.cpp:68:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < m; i++) ~~^~~ main.cpp:82:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i <= n; i++) ~~^~~~