tv.cpp: In function 'void DFS(int)': tv.cpp:25: warning: comparison between signed and unsigned integer expressions tv.cpp:28: warning: comparison between signed and unsigned integer expressions tv.cpp: In function 'int main()': tv.cpp:59: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x tv.cpp:59: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x tv.cpp:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result tv.cpp:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result tv.cpp:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result tv.cpp:54: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result tv.cpp:58: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result tv.cpp:63: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result