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Median selection requires (2+ϵ)n comparisons

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2 Author(s)
Dor, D. ; Dept. of Comput. Sci., Tel Aviv Univ., Israel ; Zwick, U.

Improving a long standing result of Bent and John (1985), we obtain a (2+ε)n lower bound (for some fixed ε>0) on the number of comparisons required, in the worst case, for selecting the median of n elements. The new lower bound is obtained using a weight function that allows us to combine leaf counting and adversary arguments

Published in:

Foundations of Computer Science, 1996. Proceedings., 37th Annual Symposium on

Date of Conference:

14-16 Oct 1996