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The missile was fired after the last missile that was intercepted and it is not higher than the last missile which was intercepted.

Posted by Zhangszu at 2009-04-22 23:42:03 on Problem 1887
The missile was fired after the last missile that was intercepted and it is not higher than the last missile which was intercepted. 

看这里以为是相等的也可以, not higher应该是高度相等或者高度低于, 如果这样这题就复杂了. 但是答案却是低于的意思. 似乎题目描述问题,大家觉得呢?

按现在的理解, 这个绝对是水题, n^2都可以过

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