arthur.cpp: In function 'void BFS(int)': arthur.cpp:81: warning: comparison between signed and unsigned integer expressions arthur.cpp: In function 'int main()': arthur.cpp:154: warning: comparison between signed and unsigned integer expressions arthur.cpp:121: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result arthur.cpp:122: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result arthur.cpp:123: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result arthur.cpp:124: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result arthur.cpp:125: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result arthur.cpp:128: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result