Fix a bug in the gcd implementation #4
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The gcd implementation requires that `a` be odd throughout the loop of the binary gcd implementation, but this wasn't enforced (we only made either `a` or `b` odd). This fixes the implementation. For some context, see https://codeforces.com/blog/entry/64203?#comment-480745.
ecnerwala
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The gcd implementation requires that
abe odd throughout the loop of the binary gcd implementation, but this wasn't enforced (we only made eitheraorbodd). This fixes the implementation.For some context, see https://codeforces.com/blog/entry/64203?#comment-480745.