{ "data": { "question": { "questionId": "1320", "questionFrontendId": "1209", "boundTopicId": null, "title": "Remove All Adjacent Duplicates in String II", "titleSlug": "remove-all-adjacent-duplicates-in-string-ii", "content": "

You are given a string s and an integer k, a k duplicate removal consists of choosing k adjacent and equal letters from s and removing them, causing the left and the right side of the deleted substring to concatenate together.

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We repeatedly make k duplicate removals on s until we no longer can.

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Return the final string after all such duplicate removals have been made. It is guaranteed that the answer is unique.

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Example 1:

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\nInput: s = "abcd", k = 2\nOutput: "abcd"\nExplanation: There's nothing to delete.
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Example 2:

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\nInput: s = "deeedbbcccbdaa", k = 3\nOutput: "aa"\nExplanation: \nFirst delete "eee" and "ccc", get "ddbbbdaa"\nThen delete "bbb", get "dddaa"\nFinally delete "ddd", get "aa"
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Example 3:

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\nInput: s = "pbbcggttciiippooaais", k = 2\nOutput: "ps"\n
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Constraints:

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Compiled with clang 11 using the latest C++ 17 standard.

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Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.

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Most standard library headers are already included automatically for your convenience.

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OpenJDK 17 . Java 8 features such as lambda expressions and stream API can be used.

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Most standard library headers are already included automatically for your convenience.

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Python 2.7.12.

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For Map/TreeMap data structure, you may use sortedcontainers library.

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Note that Python 2.7 will not be maintained past 2020. For the latest Python, please choose Python3 instead.

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Compiled with gcc 8.2 using the gnu99 standard.

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Your code is compiled with level one optimization (-O1). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.

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Most standard library headers are already included automatically for your convenience.

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For hash table operations, you may use uthash. \\\"uthash.h\\\" is included by default. Below are some examples:

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\\r\\n\\r\\n

3. Deleting an item in a hash:\\r\\n

\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n    HASH_DEL(users, user);  \\r\\n}\\r\\n
\\r\\n

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C# 10 with .NET 6 runtime

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Your code is compiled with debug flag enabled (/debug).

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Node.js 16.13.2.

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Your code is run with --harmony flag, enabling new ES6 features.

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lodash.js library is included by default.

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For Priority Queue / Queue data structures, you may use datastructures-js/priority-queue and datastructures-js/queue.

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Ruby 3.1

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Some common data structure implementations are provided in the Algorithms module: https://www.rubydoc.info/github/kanwei/algorithms/Algorithms

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Swift 5.5.2.

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Go 1.17.6.

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Python 3.10.

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Most libraries are already imported automatically for your convenience, such as array, bisect, collections. If you need more libraries, you can import it yourself.

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With bcmath module

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TypeScript 4.5.4, Node.js 16.13.2.

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