# Tag Info

## New answers tagged selection-problem

1

For the problem of computing the $k$-th rank element, a lower bound of $n-k+\log \binom{n}{k-1}$ can be proven with decision trees. For simplicity this proof assumes that the element set $X$ is of size $n$ and its elements are distinct (which makes the problem harder). Moreover, the algorithm may only compare any two elements, and conclude one is either ...

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