Paper by Erik D. Demaine

Stelian Ciurea, Erik D. Demaine, Corina E. Pǎtraşcu, and Mihai Pǎtraşcu, “Finding a Divisible Pair”, ACM SIGSAM Bulletin, volume 38, number 3, September 2004, pages 98–100.

Our problem is the natural algorithmic version of a classic mathematical result: any (n + 1)-subset of {1, …, 2n} contains a pair of divisible numbers. How do we actually find such a pair? If the subset is accessible only through a membership oracle, we show a lower bound of (4/3) n − O(1) and an almost matching upper bound of (4/3 + 1/24) n + O(1) on the number of queries necessary in the worst case.

The paper is 2 pages.

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Related papers:
Yogi_FUN2004 (Finding a Divisible Pair and a Good Wooden Fence)

See also other papers by Erik Demaine.
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Last updated March 27, 2017 by Erik Demaine.