1421 - Archery

All about problems in Volume 14. If there is a thread about your problem, please use it. If not, create one with its number in the subject.

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Leopan
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1421 - Archery

Post by Leopan » Sat Apr 20, 2013 11:59 pm

My solution to this problem is find all the upperbound and lowerbound slope from each end point.
If there is any point with upperbound < lowerbound then output NO ;otherwise ,output YES.
I used the same method and solved the same problem on Live Archive ,but got WA on uva :( .

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