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Problem: Remove All Adjacent Duplicates in String II

med
30 min
Explore how to repeatedly remove k adjacent duplicate characters from a string using stack data structures. This lesson helps you apply stack techniques for efficient string manipulation and mastering problem-solving patterns common in coding interviews.

Statement

Given a string s and an integer k, a k-duplicate removal involves selecting k adjacent and equal characters from s and removing them, after which the left and right portions of the string are joined together.

Perform k-duplicate removals on s repeatedly until no more can be made.

Return the final string after all such removals. The answer is guaranteed to be unique.

Constraints:

  • 11 \leq s.length 105\leq 10^5

  • 22 \leq k 104\leq 10^4

  • s contains only lowercase English letters

Tap here to switch tabs
Problem
Ask
Submissions

Problem: Remove All Adjacent Duplicates in String II

med
30 min
Explore how to repeatedly remove k adjacent duplicate characters from a string using stack data structures. This lesson helps you apply stack techniques for efficient string manipulation and mastering problem-solving patterns common in coding interviews.

Statement

Given a string s and an integer k, a k-duplicate removal involves selecting k adjacent and equal characters from s and removing them, after which the left and right portions of the string are joined together.

Perform k-duplicate removals on s repeatedly until no more can be made.

Return the final string after all such removals. The answer is guaranteed to be unique.

Constraints:

  • 11 \leq s.length 105\leq 10^5

  • 22 \leq k 104\leq 10^4

  • s contains only lowercase English letters