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该题的一点看法

Posted by 13107222 at 2009-07-26 13:46:21 on Problem 2777 and last updated at 2009-07-26 13:47:58 
>>>>>我想该题确实可以用线段树做，但是不能用一般思维事先把线段树完整建立，如果先建立好，在更新每一段颜色即相关信息时必须一直更新到最小段，那样很容易tle，必须边建立便更新，这样很多片段信息是没确定的，就不用去管，在更新时减少很多负担。
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