honest.cpp: In function 'void dfs(int)': honest.cpp:13: warning: comparison between signed and unsigned integer expressions honest.cpp: In function 'void dfs1(int, int)': honest.cpp:23: warning: comparison between signed and unsigned integer expressions honest.cpp: In function 'int main()': honest.cpp:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result honest.cpp:35: 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:41: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result