Longest Substring with Same Letters after Replacement (hard)

Problem Statement

Given a string with lowercase letters only, if you are allowed to replace no more than k letters with any letter, find the length of the longest substring having the same letters after replacement.

Example 1:

Input: String="aabccbb", k=2
Output: 5
Explanation: Replace the two 'c' with 'b' to have the longest repeating substring "bbbbb".

Example 2:

Input: String="abbcb", k=1
Output: 4
Explanation: Replace the 'c' with 'b' to have the longest repeating substring "bbbb".

Example 3:

Input: String="abccde", k=1
Output: 3
Explanation: Replace the 'b' or 'd' with 'c' to have the longest repeating substring "ccc".

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Introduction

Pattern: Sliding Window

Pattern: Two Pointers

Pattern: Fast and Slow Patterns

Pattern: Merge Intervals

Pattern: Cyclic Sort

Pattern: In-place Reversal of a LinkedList

Pattern: Tree Breadth First Search

Pattern: Tree Depth First Search

Pattern: Two Heaps

Pattern: Subsets

Pattern: Modified Binary Search

Pattern: Bitwise XOR

Pattern: Top 'K' Elements

Pattern: K-way merge

Pattern : 0/1 Knapsack (Dynamic Programming)

Pattern: Topological Sort (Graph)

Miscellaneous

Conclusions

Longest Substring with Same Letters after Replacement (hard)

Problem Statement

Try it yourself

Solution