arbvalmax.cpp: In function 'void first_dfs(int)': arbvalmax.cpp:15: warning: comparison between signed and unsigned integer expressions arbvalmax.cpp:23: warning: comparison between signed and unsigned integer expressions arbvalmax.cpp: In function 'void second_dfs(int)': arbvalmax.cpp:33: warning: comparison between signed and unsigned integer expressions arbvalmax.cpp: In function 'int main()': arbvalmax.cpp:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result arbvalmax.cpp:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result arbvalmax.cpp:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result arbvalmax.cpp:51: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result arbvalmax.cpp:55: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result arbvalmax.cpp:59: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result