2012 Asia ChangChun Regional Contest（2013区域赛练习）

去年比赛只去了长春，几乎没做题和看题，今天一个人做了4小时最后出了4题，可惜有一题有思路，最后没时间做了，今年这个实力估计铜都很难保证。

code:https://github.com/9974/2012Region/tree/master/changchun(已更新4424)

4421  2-sat，算很基本的了，用vector写很卡时间，写搓了就会TLE。

4422  模拟 比较水

4424  并查集，是最小生成树的拓展生成树相关问题学习

4427  很清晰的dp，只是写搓了会TLE，本人很搓，T了好几发。

4430  二分，注意要判断加数是否爆long long

Solved	Pro.ID	Title	Author	Source	(AC/Submit)Ratio
	4420	Alice and Bob		2012 Asia ChangChun Regional Contest	(36/373)9.65%
	4421	Bit Magic		2012 Asia ChangChun Regional Contest	(339/1206)28.11%
	4422	The Little Girl who Picks Mushrooms		2012 Asia ChangChun Regional Contest	(331/1018)32.51%
	4423	Simple Function		2012 Asia ChangChun Regional Contest	(33/116)28.45%
	4424	Conquer a New Region		2012 Asia ChangChun Regional Contest	(253/831)30.45%
	4425	Fantastic Necklace		2012 Asia ChangChun Regional Contest	(11/124)8.87%
	4426	Palindromic Substring		2012 Asia ChangChun Regional Contest	(46/293)15.70%
	4427	Math Magic		2012 Asia ChangChun Regional Contest	(292/749)38.99%
	4428	Polaris of Pandora		2012 Asia ChangChun Regional Contest	(13/61)21.31%
	4429	Split the Rectangle		2012 Asia ChangChun Regional Contest	(62/177)35.03%
	4430	Yukari's Birthday		2012 Asia ChangChun Regional Contest	(365/1772)20.60%