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Discussion of Problem 1075. Thread in a Space

Problem 1075 "Thread in a Space" has been rejudged
Posted by Vladimir Yakovlev (USU) 30 Apr 2018 01:03
New tests have been added to the problem which exploit a common mistake when using acos function. Hint: try to calculate acos(sqrt(3.0) * sqrt(3.0) - 4.0) in your programming language. 649 authors (60%) with accepted solutions have been challenged.
Re: Problem 1075 "Thread in a Space" has been rejudged
Posted by Sirko 12 Aug 2018 19:36
Why point out the weak place!? I've found mistake without this hint, it wasnt that hard.