Compilare: user.cpp: In function ‘int bfs(int, int)’: user.cpp:62: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:76: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:77: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int bfs(int, int)’: user.cpp:72: warning: control reaches end of non-void function