Update queue implementation (#5388)
* Update queue implementation Popping the first element of a list takes O(n) time. Using a cyclic queue takes O(1) time. * Add queue changes from extra files * Update indentation * Add empty line between imports * Fix lines * Apply suggestions from code review Co-authored-by: NJohn Law <johnlaw.po@gmail.com> Co-authored-by: NJohn Law <johnlaw.po@gmail.com>
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