Eroare de compilare: main.cpp: In function 'void bfs(int, int*)': main.cpp:19:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[node].size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:30:5: error: 'in' was not declared in this scope in >> n >> m >> x >> y; ^~ main.cpp:58:5: error: 'out' was not declared in this scope out << ans << '\n'; ^~~ Non zero exit status: 1