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

LeetCode Topics

Array

0011-container-with-most-water
0018-4sum
0039-combination-sum
0041-first-missing-positive
0042-trapping-rain-water
0055-jump-game
0056-merge-intervals
0057-insert-interval
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0078-subsets
0079-word-search
0084-largest-rectangle-in-histogram
0090-subsets-ii
0200-number-of-islands
0215-kth-largest-element-in-an-array
0216-combination-sum-iii
0217-contains-duplicate
0219-contains-duplicate-ii
0239-sliding-window-maximum
0334-increasing-triplet-subsequence
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0435-non-overlapping-intervals
0455-assign-cookies
0496-next-greater-element-i
0503-next-greater-element-ii
0560-subarray-sum-equals-k
0621-task-scheduler
0643-maximum-average-subarray-i
0658-find-k-closest-elements
0724-find-pivot-index
0735-asteroid-collision
0876-hand-of-straights
0890-lemonade-change
0898-transpose-matrix
0943-sum-of-subarray-minimums
0966-binary-subarrays-with-sum
1014-k-closest-points-to-origin
1034-subarrays-with-k-different-integers
1422-divide-array-in-sets-of-k-consecutive-numbers
1538-maximum-points-you-can-obtain-from-cards
1603-running-sum-of-1d-array
1677-matrix-diagonal-sum
1693-sum-of-all-odd-length-subarrays
2227-sum-of-subarray-ranges
2432-number-of-zero-filled-subarrays

Hash Table

0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0041-first-missing-positive
0073-set-matrix-zeroes
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0160-intersection-of-two-linked-lists
0205-isomorphic-strings
0217-contains-duplicate
0219-contains-duplicate-ii
0242-valid-anagram
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0424-longest-repeating-character-replacement
0496-next-greater-element-i
0560-subarray-sum-equals-k
0621-task-scheduler
0876-hand-of-straights
0966-binary-subarrays-with-sum
1034-subarrays-with-k-different-integers
1422-divide-array-in-sets-of-k-consecutive-numbers
1460-number-of-substrings-containing-all-three-characters
1890-sum-of-beauty-of-all-substrings

Sliding Window

0003-longest-substring-without-repeating-characters
0219-contains-duplicate-ii
0239-sliding-window-maximum
0424-longest-repeating-character-replacement
0643-maximum-average-subarray-i
0658-find-k-closest-elements
0966-binary-subarrays-with-sum
1034-subarrays-with-k-different-integers
1460-number-of-substrings-containing-all-three-characters
1538-maximum-points-you-can-obtain-from-cards

Prefix Sum

0560-subarray-sum-equals-k
0724-find-pivot-index
0966-binary-subarrays-with-sum
1538-maximum-points-you-can-obtain-from-cards
1603-running-sum-of-1d-array
1693-sum-of-all-odd-length-subarrays

Binary Search

0074-search-a-2d-matrix
0350-intersection-of-two-arrays-ii
0658-find-k-closest-elements

Matrix

0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0200-number-of-islands
0898-transpose-matrix
1677-matrix-diagonal-sum

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0008-string-to-integer-atoi
0013-roman-to-integer
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0022-generate-parentheses
0079-word-search
0125-valid-palindrome
0131-palindrome-partitioning
0151-reverse-words-in-a-string
0205-isomorphic-strings
0242-valid-anagram
0392-is-subsequence
0402-remove-k-digits
0424-longest-repeating-character-replacement
0812-rotate-string
1078-remove-outermost-parentheses
1460-number-of-substrings-containing-all-three-characters
1737-maximum-nesting-depth-of-the-parentheses
1890-sum-of-beauty-of-all-substrings
2032-largest-odd-number-in-string

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0018-4sum
0019-remove-nth-node-from-end-of-list
0042-trapping-rain-water
0125-valid-palindrome
0141-linked-list-cycle
0142-linked-list-cycle-ii
0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists
0234-palindrome-linked-list
0350-intersection-of-two-arrays-ii
0392-is-subsequence
0455-assign-cookies
0658-find-k-closest-elements
0908-middle-of-the-linked-list
2216-delete-the-middle-node-of-a-linked-list

Sorting

0018-4sum
0056-merge-intervals
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0242-valid-anagram
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0435-non-overlapping-intervals
0455-assign-cookies
0621-task-scheduler
0658-find-k-closest-elements
0876-hand-of-straights
1014-k-closest-points-to-origin
1422-divide-array-in-sets-of-k-consecutive-numbers

Counting

0347-top-k-frequent-elements
0621-task-scheduler
1034-subarrays-with-k-different-integers
1890-sum-of-beauty-of-all-substrings

Greedy

0011-container-with-most-water
0055-jump-game
0334-increasing-triplet-subsequence
0402-remove-k-digits
0435-non-overlapping-intervals
0455-assign-cookies
0621-task-scheduler
0876-hand-of-straights
0890-lemonade-change
1422-divide-array-in-sets-of-k-consecutive-numbers
2032-largest-odd-number-in-string

Dynamic Programming

0005-longest-palindromic-substring
0022-generate-parentheses
0042-trapping-rain-water
0055-jump-game
0131-palindrome-partitioning
0392-is-subsequence
0435-non-overlapping-intervals
0943-sum-of-subarray-minimums

Stack

0020-valid-parentheses
0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0094-binary-tree-inorder-traversal
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0155-min-stack
0234-palindrome-linked-list
0402-remove-k-digits
0496-next-greater-element-i
0503-next-greater-element-ii
0735-asteroid-collision
0943-sum-of-subarray-minimums
1078-remove-outermost-parentheses
1737-maximum-nesting-depth-of-the-parentheses
2227-sum-of-subarray-ranges

Monotonic Stack

0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0402-remove-k-digits
0496-next-greater-element-i
0503-next-greater-element-ii
0943-sum-of-subarray-minimums
2227-sum-of-subarray-ranges

Math

0013-roman-to-integer
0050-powx-n
1014-k-closest-points-to-origin
1693-sum-of-all-odd-length-subarrays
2032-largest-odd-number-in-string
2432-number-of-zero-filled-subarrays

Recursion

0021-merge-two-sorted-lists
0050-powx-n
0203-remove-linked-list-elements
0206-reverse-linked-list
0234-palindrome-linked-list

Backtracking

0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0039-combination-sum
0078-subsets
0079-word-search
0090-subsets-ii
0131-palindrome-partitioning
0216-combination-sum-iii

Bit Manipulation

0078-subsets
0090-subsets-ii
2323-minimum-bit-flips-to-convert-number

Depth-First Search

0079-word-search
0094-binary-tree-inorder-traversal
0116-populating-next-right-pointers-in-each-node
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0200-number-of-islands
0637-average-of-levels-in-binary-tree

Breadth-First Search

0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0107-binary-tree-level-order-traversal-ii
0116-populating-next-right-pointers-in-each-node
0200-number-of-islands
0637-average-of-levels-in-binary-tree

Union Find

0200-number-of-islands

Linked List

0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0023-merge-k-sorted-lists
0083-remove-duplicates-from-sorted-list
0116-populating-next-right-pointers-in-each-node
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0160-intersection-of-two-linked-lists
0203-remove-linked-list-elements
0206-reverse-linked-list
0234-palindrome-linked-list
0328-odd-even-linked-list
0908-middle-of-the-linked-list
2216-delete-the-middle-node-of-a-linked-list

Trie

0014-longest-common-prefix

String Matching

0812-rotate-string

Simulation

0735-asteroid-collision
0898-transpose-matrix

Divide and Conquer

0023-merge-k-sorted-lists
0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
1014-k-closest-points-to-origin

Heap (Priority Queue)

0023-merge-k-sorted-lists
0215-kth-largest-element-in-an-array
0239-sliding-window-maximum
0347-top-k-frequent-elements
0621-task-scheduler
0658-find-k-closest-elements
0789-kth-largest-element-in-a-stream
1014-k-closest-points-to-origin

Merge Sort

0023-merge-k-sorted-lists

Design

0146-lru-cache
0155-min-stack
0789-kth-largest-element-in-a-stream

Queue

0239-sliding-window-maximum

Monotonic Queue

0239-sliding-window-maximum

Doubly-Linked List

0146-lru-cache

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
1014-k-closest-points-to-origin

Tree

0094-binary-tree-inorder-traversal
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0107-binary-tree-level-order-traversal-ii
0116-populating-next-right-pointers-in-each-node
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0637-average-of-levels-in-binary-tree
0789-kth-largest-element-in-a-stream

Binary Search Tree

0789-kth-largest-element-in-a-stream

Binary Tree

0094-binary-tree-inorder-traversal
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0107-binary-tree-level-order-traversal-ii
0116-populating-next-right-pointers-in-each-node
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0637-average-of-levels-in-binary-tree
0789-kth-largest-element-in-a-stream

Data Stream

0789-kth-largest-element-in-a-stream

Bucket Sort

0347-top-k-frequent-elements

Geometry

1014-k-closest-points-to-origin

Database

0584-find-customer-referee
0595-big-countries
0620-not-boring-movies
1153-product-sales-analysis-i
1258-article-views-i
1509-replace-employee-id-with-the-unique-identifier
1724-customer-who-visited-but-did-not-make-any-transactions
1827-invalid-tweets
1908-recyclable-and-low-fat-products