I will Do iT @ hlyblog.net

Today the company has m tasks to complete. The ith task need xi minutes to complete. Meanwhile, this task has a difficulty level yi. The machine whose level below this task’s level yi cannot complete

题解:

分别从左开始计算

题目意思很简单。。 cha 掉它程序，数据不能是负环。。= = SF

三个操作单点更新[l,r] 区间自动修改chen最近的

对于每条有向边lai's

题目意思很无聊， 你可以证明两点。