trasee.cpp: In function 'int bfs()': trasee.cpp:18: warning: comparison between signed and unsigned integer expressions trasee.cpp: In function 'void bfs1()': trasee.cpp:48: warning: comparison between signed and unsigned integer expressions trasee.cpp: In function 'int main()': trasee.cpp:62: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result trasee.cpp:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result trasee.cpp:64: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result trasee.cpp:67: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result