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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
0015-3sum
0018-4sum
0027-remove-element
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0036-valid-sudoku
0039-combination-sum
0041-first-missing-positive
0042-trapping-rain-water
0045-jump-game-ii
0046-permutations
0048-rotate-image
0049-group-anagrams
0051-n-queens
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0064-minimum-path-sum
0074-search-a-2d-matrix
0078-subsets
0079-word-search
0080-remove-duplicates-from-sorted-array-ii
0088-merge-sorted-array
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0128-longest-consecutive-sequence
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
0215-kth-largest-element-in-an-array
0228-summary-ranges
0238-product-of-array-except-self
0268-missing-number
0300-longest-increasing-subsequence
0322-coin-change
0410-split-array-largest-sum
0417-pacific-atlantic-water-flow
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0494-target-sum
0643-maximum-average-subarray-i
0645-set-mismatch
0682-baseball-game
0695-max-area-of-island
0724-find-pivot-index
0739-daily-temperatures
0745-find-smallest-letter-greater-than-target
0747-min-cost-climbing-stairs
0861-flipping-an-image
0882-peak-index-in-a-mountain-array
0907-koko-eating-bananas
1014-k-closest-points-to-origin
1019-squares-of-a-sorted-array
1036-rotting-oranges
1046-max-consecutive-ones-iii
1127-last-stone-weight
1421-find-numbers-with-even-number-of-digits
1706-min-cost-to-connect-all-points
1791-richest-customer-wealth
2350-find-closest-number-to-zero

Matrix

0036-valid-sudoku
0048-rotate-image
0054-spiral-matrix
0064-minimum-path-sum
0074-search-a-2d-matrix
0079-word-search
0200-number-of-islands
0417-pacific-atlantic-water-flow
0695-max-area-of-island
0861-flipping-an-image
1036-rotting-oranges
1791-richest-customer-wealth

Binary Search

0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-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
0367-valid-perfect-square
0410-split-array-largest-sum
0745-find-smallest-letter-greater-than-target
0882-peak-index-in-a-mountain-array
0907-koko-eating-bananas
1046-max-consecutive-ones-iii

Dynamic Programming

0022-generate-parentheses
0042-trapping-rain-water
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0062-unique-paths
0064-minimum-path-sum
0070-climbing-stairs
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0198-house-robber
0300-longest-increasing-subsequence
0322-coin-change
0392-is-subsequence
0410-split-array-largest-sum
0494-target-sum
0747-min-cost-climbing-stairs
1013-fibonacci-number
1250-longest-common-subsequence

Greedy

0011-container-with-most-water
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0410-split-array-largest-sum

Prefix Sum

0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0410-split-array-largest-sum
0724-find-pivot-index
1046-max-consecutive-ones-iii

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0036-valid-sudoku
0041-first-missing-positive
0049-group-anagrams
0128-longest-consecutive-sequence
0133-clone-graph
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0169-majority-element
0202-happy-number
0208-implement-trie-prefix-tree
0242-valid-anagram
0268-missing-number
0383-ransom-note
0424-longest-repeating-character-replacement
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0567-permutation-in-string
0645-set-mismatch
0782-jewels-and-stones
1297-maximum-number-of-balloons

Math

0002-add-two-numbers
0013-roman-to-integer
0048-rotate-image
0062-unique-paths
0070-climbing-stairs
0150-evaluate-reverse-polish-notation
0202-happy-number
0268-missing-number
0367-valid-perfect-square
1013-fibonacci-number
1014-k-closest-points-to-origin

Bit Manipulation

0078-subsets
0268-missing-number
0645-set-mismatch
0861-flipping-an-image

Sorting

0015-3sum
0018-4sum
0049-group-anagrams
0056-merge-intervals
0088-merge-sorted-array
0169-majority-element
0215-kth-largest-element-in-an-array
0242-valid-anagram
0268-missing-number
0645-set-mismatch
1014-k-closest-points-to-origin
1019-squares-of-a-sorted-array

Two Pointers

0011-container-with-most-water
0015-3sum
0018-4sum
0019-remove-nth-node-from-end-of-list
0027-remove-element
0042-trapping-rain-water
0080-remove-duplicates-from-sorted-array-ii
0088-merge-sorted-array
0125-valid-palindrome
0141-linked-list-cycle
0167-two-sum-ii-input-array-is-sorted
0202-happy-number
0344-reverse-string
0392-is-subsequence
0567-permutation-in-string
0861-flipping-an-image
0908-middle-of-the-linked-list
1019-squares-of-a-sorted-array
1894-merge-strings-alternately

String

0003-longest-substring-without-repeating-characters
0006-zigzag-conversion
0013-roman-to-integer
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0022-generate-parentheses
0049-group-anagrams
0079-word-search
0125-valid-palindrome
0208-implement-trie-prefix-tree
0242-valid-anagram
0344-reverse-string
0383-ransom-note
0392-is-subsequence
0424-longest-repeating-character-replacement
0567-permutation-in-string
0782-jewels-and-stones
1250-longest-common-subsequence
1297-maximum-number-of-balloons
1894-merge-strings-alternately

Trie

0014-longest-common-prefix
0208-implement-trie-prefix-tree

Counting

0169-majority-element
0383-ransom-note
1297-maximum-number-of-balloons

Divide and Conquer

0023-merge-k-sorted-lists
0053-maximum-subarray
0169-majority-element
0215-kth-largest-element-in-an-array
1014-k-closest-points-to-origin

Union Find

0128-longest-consecutive-sequence
0200-number-of-islands
0695-max-area-of-island
1706-min-cost-to-connect-all-points
2121-find-if-path-exists-in-graph

Stack

0020-valid-parentheses
0042-trapping-rain-water
0150-evaluate-reverse-polish-notation
0155-min-stack
0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0682-baseball-game
0739-daily-temperatures

Monotonic Stack

0042-trapping-rain-water
0739-daily-temperatures

Simulation

0054-spiral-matrix
0682-baseball-game
0861-flipping-an-image

Design

0155-min-stack
0208-implement-trie-prefix-tree
0225-implement-stack-using-queues
0232-implement-queue-using-stacks

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0023-merge-k-sorted-lists
0083-remove-duplicates-from-sorted-list
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0206-reverse-linked-list
0908-middle-of-the-linked-list

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0206-reverse-linked-list
1013-fibonacci-number

Interactive

0278-first-bad-version

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
1046-max-consecutive-ones-iii

Tree

0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0112-path-sum
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0530-minimum-absolute-difference-in-bst
0543-diameter-of-binary-tree
0572-subtree-of-another-tree

Depth-First Search

0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0112-path-sum
0133-clone-graph
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0417-pacific-atlantic-water-flow
0530-minimum-absolute-difference-in-bst
0543-diameter-of-binary-tree
0572-subtree-of-another-tree
0695-max-area-of-island
0744-network-delay-time
2121-find-if-path-exists-in-graph

Breadth-First Search

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0112-path-sum
0133-clone-graph
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0226-invert-binary-tree
0322-coin-change
0417-pacific-atlantic-water-flow
0530-minimum-absolute-difference-in-bst
0695-max-area-of-island
0744-network-delay-time
1036-rotting-oranges
2121-find-if-path-exists-in-graph

Binary Tree

0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0112-path-sum
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0530-minimum-absolute-difference-in-bst
0543-diameter-of-binary-tree
0572-subtree-of-another-tree

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
0530-minimum-absolute-difference-in-bst

Heap (Priority Queue)

0023-merge-k-sorted-lists
0215-kth-largest-element-in-an-array
0744-network-delay-time
1014-k-closest-points-to-origin
1127-last-stone-weight

Quickselect

0215-kth-largest-element-in-an-array
1014-k-closest-points-to-origin

Geometry

1014-k-closest-points-to-origin

Merge Sort

0023-merge-k-sorted-lists

Backtracking

0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0039-combination-sum
0046-permutations
0051-n-queens
0077-combinations
0078-subsets
0079-word-search
0494-target-sum

Memoization

0070-climbing-stairs
1013-fibonacci-number

Combinatorics

0062-unique-paths

Graph

0133-clone-graph
0207-course-schedule
0210-course-schedule-ii
0744-network-delay-time
1706-min-cost-to-connect-all-points
2121-find-if-path-exists-in-graph

Topological Sort

0207-course-schedule
0210-course-schedule-ii

Minimum Spanning Tree

1706-min-cost-to-connect-all-points

Shortest Path

0744-network-delay-time

Queue

0225-implement-stack-using-queues
0232-implement-queue-using-stacks

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