[Subject link] http://acm.hdu.edu.cn/showproblem.php?pid=2454
Blog address: https://www.cnblogs.com/debugcool/archive/2011/04/23/HDOJ2454.html
In a word, the Havel theorem of vertex deg
[Subject link] http://acm.hdu.edu.cn/showproblem.php?pid=2454
Blog address: https://www.cnblogs.com/debugcool/archive/2011/04/23/HDOJ2454.html
In a word, the Havel theorem of vertex deg