honest.cpp: In function 'void dfs1(int)': honest.cpp:13: warning: comparison between signed and unsigned integer expressions honest.cpp: In function 'void dfs2(int)': honest.cpp:21: warning: comparison between signed and unsigned integer expressions honest.cpp: In function 'int main()': honest.cpp:52: warning: comparison between signed and unsigned integer expressions honest.cpp:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result honest.cpp:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result honest.cpp:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result honest.cpp:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result