honest.cpp: In function 'void DFS(int)': honest.cpp:17: warning: comparison between signed and unsigned integer expressions honest.cpp: In function 'int main()': honest.cpp:49: warning: comparison between signed and unsigned integer expressions honest.cpp:59: warning: comparison between signed and unsigned integer expressions honest.cpp:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result honest.cpp:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result honest.cpp:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result honest.cpp:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result