LeetCode Topics

A collection of LeetCode questions to ace the coding interview! - Created using LeetHub v2

LeetCode Topics

Math


0002-add-two-numbers
0007-reverse-integer
0012-integer-to-roman
0013-roman-to-integer
0066-plus-one
0069-sqrtx
0070-climbing-stairs
0150-evaluate-reverse-polish-notation
0189-rotate-array
0202-happy-number
0263-ugly-number
0268-missing-number
0380-insert-delete-getrandom-o1

Array


0001-two-sum
0011-container-with-most-water
0026-remove-duplicates-from-sorted-array
0027-remove-element
0045-jump-game-ii
0049-group-anagrams
0055-jump-game
0056-merge-intervals
0066-plus-one
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0080-remove-duplicates-from-sorted-array-ii
0118-pascals-triangle
0128-longest-consecutive-sequence
0134-gas-station
0150-evaluate-reverse-polish-notation
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0189-rotate-array
0198-house-robber
0200-number-of-islands
0215-kth-largest-element-in-an-array
0219-contains-duplicate-ii
0238-product-of-array-except-self
0268-missing-number
0347-top-k-frequent-elements
0380-insert-delete-getrandom-o1
0455-assign-cookies
0643-maximum-average-subarray-i
0792-binary-search

Sliding Window


0003-longest-substring-without-repeating-characters
0219-contains-duplicate-ii
0643-maximum-average-subarray-i

Tree


0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0107-binary-tree-level-order-traversal-ii
0111-minimum-depth-of-binary-tree
0112-path-sum
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0637-average-of-levels-in-binary-tree

Depth-First Search


0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0199-binary-tree-right-side-view
0200-number-of-islands
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0637-average-of-levels-in-binary-tree

Breadth-First Search


0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0107-binary-tree-level-order-traversal-ii
0111-minimum-depth-of-binary-tree
0112-path-sum
0199-binary-tree-right-side-view
0200-number-of-islands
0226-invert-binary-tree
0637-average-of-levels-in-binary-tree

Binary Tree


0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0107-binary-tree-level-order-traversal-ii
0111-minimum-depth-of-binary-tree
0112-path-sum
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0637-average-of-levels-in-binary-tree

Hash Table


0001-two-sum
0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0013-roman-to-integer
0049-group-anagrams
0073-set-matrix-zeroes
0128-longest-consecutive-sequence
0141-linked-list-cycle
0142-linked-list-cycle-ii
0169-majority-element
0202-happy-number
0205-isomorphic-strings
0219-contains-duplicate-ii
0242-valid-anagram
0268-missing-number
0290-word-pattern
0347-top-k-frequent-elements
0380-insert-delete-getrandom-o1
0383-ransom-note
0409-longest-palindrome

String


0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0012-integer-to-roman
0013-roman-to-integer
0014-longest-common-prefix
0020-valid-parentheses
0028-find-the-index-of-the-first-occurrence-in-a-string
0049-group-anagrams
0071-simplify-path
0125-valid-palindrome
0151-reverse-words-in-a-string
0205-isomorphic-strings
0242-valid-anagram
0290-word-pattern
0316-remove-duplicate-letters
0383-ransom-note
0392-is-subsequence
0409-longest-palindrome

Counting


0169-majority-element
0347-top-k-frequent-elements
0383-ransom-note

Stack


0020-valid-parentheses
0071-simplify-path
0094-binary-tree-inorder-traversal
0150-evaluate-reverse-polish-notation
0155-min-stack
0316-remove-duplicate-letters

Dynamic Programming


0005-longest-palindromic-substring
0045-jump-game-ii
0055-jump-game
0070-climbing-stairs
0118-pascals-triangle
0198-house-robber
0392-is-subsequence

Greedy


0011-container-with-most-water
0045-jump-game-ii
0055-jump-game
0134-gas-station
0316-remove-duplicate-letters
0409-longest-palindrome
0455-assign-cookies

Trie


0014-longest-common-prefix

Two Pointers


0005-longest-palindromic-substring
0011-container-with-most-water
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string
0061-rotate-list
0080-remove-duplicates-from-sorted-array-ii
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0125-valid-palindrome
0141-linked-list-cycle
0142-linked-list-cycle-ii
0151-reverse-words-in-a-string
0167-two-sum-ii-input-array-is-sorted
0189-rotate-array
0202-happy-number
0392-is-subsequence
0455-assign-cookies

String Matching


0028-find-the-index-of-the-first-occurrence-in-a-string

Design


0155-min-stack
0380-insert-delete-getrandom-o1

Prefix Sum


0238-product-of-array-except-self

Linked List


0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0092-reverse-linked-list-ii
0141-linked-list-cycle
0142-linked-list-cycle-ii
0206-reverse-linked-list

Recursion


0002-add-two-numbers
0021-merge-two-sorted-lists
0206-reverse-linked-list

Binary Search


0069-sqrtx
0074-search-a-2d-matrix
0167-two-sum-ii-input-array-is-sorted
0222-count-complete-tree-nodes
0268-missing-number
0792-binary-search

Bit Manipulation


0222-count-complete-tree-nodes
0268-missing-number

Sorting


0049-group-anagrams
0056-merge-intervals
0169-majority-element
0215-kth-largest-element-in-an-array
0242-valid-anagram
0268-missing-number
0347-top-k-frequent-elements
0455-assign-cookies

Binary Search Tree


0098-validate-binary-search-tree
0230-kth-smallest-element-in-a-bst

Divide and Conquer


0169-majority-element
0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Heap (Priority Queue)


0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Bucket Sort


0347-top-k-frequent-elements

Quickselect


0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Memoization


0070-climbing-stairs

Union Find


0128-longest-consecutive-sequence
0200-number-of-islands

Matrix


0073-set-matrix-zeroes
0074-search-a-2d-matrix
0200-number-of-islands

Randomized


0380-insert-delete-getrandom-o1

Monotonic Stack


0316-remove-duplicate-letters

Name		Name	Last commit message	Last commit date
Latest commit History 761 Commits
0001-two-sum		0001-two-sum
0002-add-two-numbers		0002-add-two-numbers
0003-longest-substring-without-repeating-characters		0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring		0005-longest-palindromic-substring
0007-reverse-integer		0007-reverse-integer
0011-container-with-most-water		0011-container-with-most-water
0012-integer-to-roman		0012-integer-to-roman
0013-roman-to-integer		0013-roman-to-integer
0014-longest-common-prefix		0014-longest-common-prefix
0019-remove-nth-node-from-end-of-list		0019-remove-nth-node-from-end-of-list
0020-valid-parentheses		0020-valid-parentheses
0021-merge-two-sorted-lists		0021-merge-two-sorted-lists
0026-remove-duplicates-from-sorted-array		0026-remove-duplicates-from-sorted-array
0027-remove-element		0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string		0028-find-the-index-of-the-first-occurrence-in-a-string
0045-jump-game-ii		0045-jump-game-ii
0049-group-anagrams		0049-group-anagrams
0055-jump-game		0055-jump-game
0056-merge-intervals		0056-merge-intervals
0061-rotate-list		0061-rotate-list
0066-plus-one		0066-plus-one
0069-sqrtx		0069-sqrtx
0070-climbing-stairs		0070-climbing-stairs
0071-simplify-path		0071-simplify-path
0073-set-matrix-zeroes		0073-set-matrix-zeroes
0074-search-a-2d-matrix		0074-search-a-2d-matrix
0080-remove-duplicates-from-sorted-array-ii		0080-remove-duplicates-from-sorted-array-ii
0082-remove-duplicates-from-sorted-list-ii		0082-remove-duplicates-from-sorted-list-ii
0086-partition-list		0086-partition-list
0092-reverse-linked-list-ii		0092-reverse-linked-list-ii
0094-binary-tree-inorder-traversal		0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree		0098-validate-binary-search-tree
0100-same-tree		0100-same-tree
0101-symmetric-tree		0101-symmetric-tree
0102-binary-tree-level-order-traversal		0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal		0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree		0104-maximum-depth-of-binary-tree
0107-binary-tree-level-order-traversal-ii		0107-binary-tree-level-order-traversal-ii
0111-minimum-depth-of-binary-tree		0111-minimum-depth-of-binary-tree
0112-path-sum		0112-path-sum
0118-pascals-triangle		0118-pascals-triangle
0125-valid-palindrome		0125-valid-palindrome
0128-longest-consecutive-sequence		0128-longest-consecutive-sequence
0134-gas-station		0134-gas-station
0141-linked-list-cycle		0141-linked-list-cycle
0142-linked-list-cycle-ii		0142-linked-list-cycle-ii
0150-evaluate-reverse-polish-notation		0150-evaluate-reverse-polish-notation
0151-reverse-words-in-a-string		0151-reverse-words-in-a-string
0155-min-stack		0155-min-stack
0167-two-sum-ii-input-array-is-sorted		0167-two-sum-ii-input-array-is-sorted
0169-majority-element		0169-majority-element
0189-rotate-array		0189-rotate-array
0198-house-robber		0198-house-robber
0199-binary-tree-right-side-view		0199-binary-tree-right-side-view
0200-number-of-islands		0200-number-of-islands
0202-happy-number		0202-happy-number
0205-isomorphic-strings		0205-isomorphic-strings
0206-reverse-linked-list		0206-reverse-linked-list
0215-kth-largest-element-in-an-array		0215-kth-largest-element-in-an-array
0219-contains-duplicate-ii		0219-contains-duplicate-ii
0222-count-complete-tree-nodes		0222-count-complete-tree-nodes
0226-invert-binary-tree		0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst		0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree		0236-lowest-common-ancestor-of-a-binary-tree
0238-product-of-array-except-self		0238-product-of-array-except-self
0242-valid-anagram		0242-valid-anagram
0263-ugly-number		0263-ugly-number
0268-missing-number		0268-missing-number
0290-word-pattern		0290-word-pattern
0316-remove-duplicate-letters		0316-remove-duplicate-letters
0347-top-k-frequent-elements		0347-top-k-frequent-elements
0380-insert-delete-getrandom-o1		0380-insert-delete-getrandom-o1
0383-ransom-note		0383-ransom-note
0392-is-subsequence		0392-is-subsequence
0409-longest-palindrome		0409-longest-palindrome
0455-assign-cookies		0455-assign-cookies
0637-average-of-levels-in-binary-tree		0637-average-of-levels-in-binary-tree
0643-maximum-average-subarray-i		0643-maximum-average-subarray-i
0792-binary-search		0792-binary-search
README.md		README.md
stats.json		stats.json

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LeetCode Topics

Math

Array

Sliding Window

Tree

Depth-First Search

Breadth-First Search

Binary Tree

Hash Table

String

Counting

Stack

Dynamic Programming

Greedy

Trie

Two Pointers

String Matching

Design

Prefix Sum

Linked List

Recursion

Binary Search

Bit Manipulation

Sorting

Binary Search Tree

Divide and Conquer

Heap (Priority Queue)

Bucket Sort

Quickselect

Memoization

Union Find

Matrix

Randomized

Monotonic Stack

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