Frequent Words with Mismatches Problem (Frequent Words with Mismatches Problem)

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Description

Given two strings, determine the most frequent substring with at most $k$ mismatches, where mismatches are not counted towards the length of the substring.

Parameters

n: length of string

k: length of words

d: number of allowed mismatches

sigma: size of alphabet

Table of Algorithms

Name Year Time Space Approximation Factor Model Reference
Naive solution 1940 $O(n*f_{bin}(sigma-{1}, k, d)$) where f_{bin}(x, y, z) = sum_{i=0}^z C(y, i)*x^i $O(max(n*f_{bin}(sigma-{1}, k, d)$, sigma^k)) auxiliary where f_{bin}(x, y, z) = sum_{i=0}^z C(y, i)*x^i Exact Deterministic

Time Complexity Graph

Frequent Words with Mismatches Problem - Time.png

Space Complexity Graph

Frequent Words with Mismatches Problem - Space.png

Pareto Frontier Improvements Graph

Frequent Words with Mismatches Problem - Pareto Frontier.png