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

LeetCode Topics

Array

0001-two-sum
0011-container-with-most-water
0014-longest-common-prefix
0015-3sum
0016-3sum-closest
0026-remove-duplicates-from-sorted-array
0033-search-in-rotated-sorted-array
0035-search-insert-position
0036-valid-sudoku
0042-trapping-rain-water
0049-group-anagrams
0056-merge-intervals
0057-insert-interval
0074-search-a-2d-matrix
0075-sort-colors
0084-largest-rectangle-in-histogram
0121-best-time-to-buy-and-sell-stock
0128-longest-consecutive-sequence
0136-single-number
0150-evaluate-reverse-polish-notation
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0198-house-robber
0200-number-of-islands
0209-minimum-size-subarray-sum
0212-word-search-ii
0213-house-robber-ii
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0238-product-of-array-except-self
0268-missing-number
0283-move-zeroes
0300-longest-increasing-subsequence
0322-coin-change
0347-top-k-frequent-elements
0417-pacific-atlantic-water-flow
0448-find-all-numbers-disappeared-in-an-array
0496-next-greater-element-i
0560-subarray-sum-equals-k
0621-task-scheduler
0643-maximum-average-subarray-i
0704-binary-search
0733-flood-fill
0739-daily-temperatures
0746-min-cost-climbing-stairs
0875-koko-eating-bananas
0904-fruit-into-baskets
0977-squares-of-a-sorted-array
0997-find-the-town-judge
1046-last-stone-weight
2280-minimum-lines-to-represent-a-line-chart

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0036-valid-sudoku
0049-group-anagrams
0128-longest-consecutive-sequence
0133-clone-graph
0141-linked-list-cycle
0160-intersection-of-two-linked-lists
0169-majority-element
0208-implement-trie-prefix-tree
0217-contains-duplicate
0242-valid-anagram
0268-missing-number
0347-top-k-frequent-elements
0424-longest-repeating-character-replacement
0448-find-all-numbers-disappeared-in-an-array
0496-next-greater-element-i
0560-subarray-sum-equals-k
0567-permutation-in-string
0621-task-scheduler
0904-fruit-into-baskets
0997-find-the-town-judge

Sorting

0015-3sum
0016-3sum-closest
0049-group-anagrams
0056-merge-intervals
0075-sort-colors
0169-majority-element
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0242-valid-anagram
0268-missing-number
0347-top-k-frequent-elements
0621-task-scheduler
0977-squares-of-a-sorted-array
2280-minimum-lines-to-represent-a-line-chart

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0014-longest-common-prefix
0020-valid-parentheses
0049-group-anagrams
0067-add-binary
0125-valid-palindrome
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0212-word-search-ii
0242-valid-anagram
0344-reverse-string
0394-decode-string
0424-longest-repeating-character-replacement
0567-permutation-in-string

Divide and Conquer

0169-majority-element
0190-reverse-bits
0191-number-of-1-bits
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
0621-task-scheduler
0703-kth-largest-element-in-a-stream
1046-last-stone-weight

Bucket Sort

0347-top-k-frequent-elements

Counting

0169-majority-element
0347-top-k-frequent-elements
0621-task-scheduler

Quickselect

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

Prefix Sum

0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0560-subarray-sum-equals-k

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0015-3sum
0016-3sum-closest
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0042-trapping-rain-water
0075-sort-colors
0125-valid-palindrome
0141-linked-list-cycle
0143-reorder-list
0160-intersection-of-two-linked-lists
0167-two-sum-ii-input-array-is-sorted
0283-move-zeroes
0344-reverse-string
0567-permutation-in-string
0876-middle-of-the-linked-list
0977-squares-of-a-sorted-array

Binary Search

0033-search-in-rotated-sorted-array
0035-search-insert-position
0074-search-a-2d-matrix
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0167-two-sum-ii-input-array-is-sorted
0209-minimum-size-subarray-sum
0268-missing-number
0278-first-bad-version
0300-longest-increasing-subsequence
0704-binary-search
0875-koko-eating-bananas

Greedy

0011-container-with-most-water
0621-task-scheduler

Dynamic Programming

0005-longest-palindromic-substring
0042-trapping-rain-water
0070-climbing-stairs
0121-best-time-to-buy-and-sell-stock
0198-house-robber
0213-house-robber-ii
0300-longest-increasing-subsequence
0322-coin-change
0338-counting-bits
0509-fibonacci-number
0746-min-cost-climbing-stairs

Sliding Window

0003-longest-substring-without-repeating-characters
0209-minimum-size-subarray-sum
0424-longest-repeating-character-replacement
0567-permutation-in-string
0643-maximum-average-subarray-i
0904-fruit-into-baskets

Stack

0020-valid-parentheses
0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0143-reorder-list
0144-binary-tree-preorder-traversal
0150-evaluate-reverse-polish-notation
0155-min-stack
0232-implement-queue-using-stacks
0394-decode-string
0496-next-greater-element-i
0739-daily-temperatures

Design

0155-min-stack
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0232-implement-queue-using-stacks
0703-kth-largest-element-in-a-stream

Queue

0232-implement-queue-using-stacks

Math

0002-add-two-numbers
0029-divide-two-integers
0067-add-binary
0070-climbing-stairs
0150-evaluate-reverse-polish-notation
0268-missing-number
0371-sum-of-two-integers
0509-fibonacci-number
2280-minimum-lines-to-represent-a-line-chart

Monotonic Stack

0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0496-next-greater-element-i
0739-daily-temperatures

Matrix

0036-valid-sudoku
0074-search-a-2d-matrix
0200-number-of-islands
0212-word-search-ii
0417-pacific-atlantic-water-flow
0733-flood-fill

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0083-remove-duplicates-from-sorted-list
0141-linked-list-cycle
0143-reorder-list
0160-intersection-of-two-linked-lists
0206-reverse-linked-list
0876-middle-of-the-linked-list

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0143-reorder-list
0206-reverse-linked-list
0394-decode-string
0509-fibonacci-number

Tree

0098-validate-binary-search-tree
0100-same-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0112-path-sum
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0543-diameter-of-binary-tree
0572-subtree-of-another-tree
0703-kth-largest-element-in-a-stream

Depth-First Search

0098-validate-binary-search-tree
0100-same-tree
0104-maximum-depth-of-binary-tree
0112-path-sum
0133-clone-graph
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0211-design-add-and-search-words-data-structure
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0417-pacific-atlantic-water-flow
0543-diameter-of-binary-tree
0572-subtree-of-another-tree
0733-flood-fill

Breadth-First Search

0100-same-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0112-path-sum
0133-clone-graph
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0226-invert-binary-tree
0322-coin-change
0417-pacific-atlantic-water-flow
0733-flood-fill

Binary Tree

0098-validate-binary-search-tree
0100-same-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0112-path-sum
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0543-diameter-of-binary-tree
0572-subtree-of-another-tree
0703-kth-largest-element-in-a-stream

String Matching

0572-subtree-of-another-tree

Hash Function

0572-subtree-of-another-tree

Binary Search Tree

0098-validate-binary-search-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0703-kth-largest-element-in-a-stream

Trie

0014-longest-common-prefix
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0212-word-search-ii

Bit Manipulation

0029-divide-two-integers
0067-add-binary
0136-single-number
0190-reverse-bits
0191-number-of-1-bits
0268-missing-number
0338-counting-bits
0371-sum-of-two-integers

Union-Find

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

Interactive

0278-first-bad-version

Backtracking

0212-word-search-ii

Data Stream

0703-kth-largest-element-in-a-stream

Graph Theory

0133-clone-graph
0207-course-schedule
0997-find-the-town-judge

Topological Sort

0207-course-schedule

Memoization

0070-climbing-stairs
0509-fibonacci-number

Simulation

0067-add-binary

Geometry

2280-minimum-lines-to-represent-a-line-chart

Number Theory

2280-minimum-lines-to-represent-a-line-chart