LeetCodeQuestions

Collection of LeetCode questions to ace the coding interview! - Created using LeetHub

LeetCode Topics

Array

0004-median-of-two-sorted-arrays
0011-container-with-most-water
0033-search-in-rotated-sorted-array
0039-combination-sum
0041-first-missing-positive
0042-trapping-rain-water
0045-jump-game-ii
0046-permutations
0047-permutations-ii
0049-group-anagrams
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0074-search-a-2d-matrix
0078-subsets
0084-largest-rectangle-in-histogram
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
0134-gas-station
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
0189-rotate-array
0209-minimum-size-subarray-sum
0215-kth-largest-element-in-an-array
0238-product-of-array-except-self
0268-missing-number
0283-move-zeroes
0287-find-the-duplicate-number
0300-longest-increasing-subsequence
0303-range-sum-query-immutable
0322-coin-change
0347-top-k-frequent-elements
0416-partition-equal-subset-sum
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0485-max-consecutive-ones
0496-next-greater-element-i
0523-continuous-subarray-sum
0525-contiguous-array
0560-subarray-sum-equals-k
0643-maximum-average-subarray-i
0645-set-mismatch
0674-longest-continuous-increasing-subsequence
0689-maximum-sum-of-3-non-overlapping-subarrays
0735-asteroid-collision
0739-daily-temperatures
0792-binary-search
0871-minimum-number-of-refueling-stops
0875-koko-eating-bananas
0948-sort-an-array
1016-subarray-sums-divisible-by-k
1025-minimum-cost-for-tickets
1046-max-consecutive-ones-iii
1169-invalid-transactions
1364-tuple-with-same-product
1635-number-of-good-pairs
1675-magnetic-force-between-two-balls
1700-minimum-time-to-make-rope-colorful
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1878-check-if-array-is-sorted-and-rotated
1886-minimum-limit-of-balls-in-a-bag
1917-maximum-average-pass-ratio
1927-maximum-ascending-subarray-sum
2164-two-best-non-overlapping-events
2350-find-closest-number-to-zero
2358-number-of-ways-to-split-array
2461-maximum-sum-of-distinct-subarrays-with-length-k
2465-shifting-letters-ii
2691-count-vowel-strings-in-ranges
2868-continuous-subarrays
3181-find-building-where-alice-and-bob-can-meet
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3427-special-array-ii
3434-find-the-number-of-distinct-colors-among-the-balls
3555-final-array-state-after-k-multiplication-operations-i

Binary Search

0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
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
0287-find-the-duplicate-number
0300-longest-increasing-subsequence
0792-binary-search
0875-koko-eating-bananas
1046-max-consecutive-ones-iii
1675-magnetic-force-between-two-balls
1886-minimum-limit-of-balls-in-a-bag
2164-two-best-non-overlapping-events
3181-find-building-where-alice-and-bob-can-meet
3427-special-array-ii

Dynamic Programming

0005-longest-palindromic-substring
0032-longest-valid-parentheses
0042-trapping-rain-water
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0070-climbing-stairs
0091-decode-ways
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0124-binary-tree-maximum-path-sum
0300-longest-increasing-subsequence
0322-coin-change
0392-is-subsequence
0416-partition-equal-subset-sum
0689-maximum-sum-of-3-non-overlapping-subarrays
0871-minimum-number-of-refueling-stops
1025-minimum-cost-for-tickets
1632-number-of-good-ways-to-split-a-string
1700-minimum-time-to-make-rope-colorful
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
2164-two-best-non-overlapping-events
2562-count-ways-to-build-good-strings

Sorting

0049-group-anagrams
0056-merge-intervals
0088-merge-sorted-array
0169-majority-element
0215-kth-largest-element-in-an-array
0268-missing-number
0295-find-median-from-data-stream
0347-top-k-frequent-elements
0645-set-mismatch
0948-sort-an-array
1169-invalid-transactions
1675-magnetic-force-between-two-balls
2164-two-best-non-overlapping-events

Heap (Priority Queue)

0023-merge-k-sorted-lists
0215-kth-largest-element-in-an-array
0295-find-median-from-data-stream
0347-top-k-frequent-elements
0871-minimum-number-of-refueling-stops
0948-sort-an-array
1917-maximum-average-pass-ratio
2164-two-best-non-overlapping-events
2868-continuous-subarrays
3181-find-building-where-alice-and-bob-can-meet
3555-final-array-state-after-k-multiplication-operations-i

Prefix Sum

0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0303-range-sum-query-immutable
0523-continuous-subarray-sum
0525-contiguous-array
0560-subarray-sum-equals-k
1016-subarray-sums-divisible-by-k
1046-max-consecutive-ones-iii
1537-maximum-score-after-splitting-a-string
2059-unique-length-3-palindromic-subsequences
2358-number-of-ways-to-split-array
2465-shifting-letters-ii
2691-count-vowel-strings-in-ranges
3427-special-array-ii

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0019-remove-nth-node-from-end-of-list
0042-trapping-rain-water
0061-rotate-list
0088-merge-sorted-array
0141-linked-list-cycle
0142-linked-list-cycle-ii
0160-intersection-of-two-linked-lists
0167-two-sum-ii-input-array-is-sorted
0189-rotate-array
0202-happy-number
0234-palindrome-linked-list
0283-move-zeroes
0287-find-the-duplicate-number
0295-find-median-from-data-stream
0392-is-subsequence
0908-middle-of-the-linked-list

Backtracking

0017-letter-combinations-of-a-phone-number
0039-combination-sum
0046-permutations
0047-permutations-ii
0077-combinations
0078-subsets
0813-all-paths-from-source-to-target

Depth-First Search

0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0236-lowest-common-ancestor-of-a-binary-tree
0437-path-sum-iii
0515-find-largest-value-in-each-tree-row
0543-diameter-of-binary-tree
0813-all-paths-from-source-to-target
2493-reverse-odd-levels-of-binary-tree
3058-maximum-number-of-k-divisible-components
3439-find-minimum-diameter-after-merging-two-trees

Breadth-First Search

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0199-binary-tree-right-side-view
0322-coin-change
0515-find-largest-value-in-each-tree-row
0813-all-paths-from-source-to-target
2493-reverse-odd-levels-of-binary-tree
3439-find-minimum-diameter-after-merging-two-trees

Graph

0813-all-paths-from-source-to-target
3439-find-minimum-diameter-after-merging-two-trees

Bit Manipulation

0078-subsets
0268-missing-number
0287-find-the-duplicate-number
0645-set-mismatch
1632-number-of-good-ways-to-split-a-string
2059-unique-length-3-palindromic-subsequences

Queue

2868-continuous-subarrays

Sliding Window

0003-longest-substring-without-repeating-characters
0209-minimum-size-subarray-sum
0424-longest-repeating-character-replacement
0643-maximum-average-subarray-i
1046-max-consecutive-ones-iii
2461-maximum-sum-of-distinct-subarrays-with-length-k
2868-continuous-subarrays

Ordered Set

2868-continuous-subarrays

Monotonic Queue

2868-continuous-subarrays

Greedy

0011-container-with-most-water
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0134-gas-station
0316-remove-duplicate-letters
0871-minimum-number-of-refueling-stops
1159-smallest-subsequence-of-distinct-characters
1700-minimum-time-to-make-rope-colorful
1917-maximum-average-pass-ratio

Math

0002-add-two-numbers
0070-climbing-stairs
0150-evaluate-reverse-polish-notation
0189-rotate-array
0202-happy-number
0224-basic-calculator
0268-missing-number
0523-continuous-subarray-sum
1635-number-of-good-pairs
3555-final-array-state-after-k-multiplication-operations-i

Simulation

0054-spiral-matrix
0735-asteroid-collision
2470-removing-stars-from-a-string
3434-find-the-number-of-distinct-colors-among-the-balls
3555-final-array-state-after-k-multiplication-operations-i

Tree

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0236-lowest-common-ancestor-of-a-binary-tree
0437-path-sum-iii
0515-find-largest-value-in-each-tree-row
0543-diameter-of-binary-tree
2493-reverse-odd-levels-of-binary-tree
3058-maximum-number-of-k-divisible-components
3439-find-minimum-diameter-after-merging-two-trees

Binary Tree

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0236-lowest-common-ancestor-of-a-binary-tree
0437-path-sum-iii
0515-find-largest-value-in-each-tree-row
0543-diameter-of-binary-tree
2493-reverse-odd-levels-of-binary-tree

Stack

0020-valid-parentheses
0032-longest-valid-parentheses
0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0144-binary-tree-preorder-traversal
0150-evaluate-reverse-polish-notation
0224-basic-calculator
0234-palindrome-linked-list
0316-remove-duplicate-letters
0496-next-greater-element-i
0735-asteroid-collision
0739-daily-temperatures
1128-remove-all-adjacent-duplicates-in-string
1159-smallest-subsequence-of-distinct-characters
2470-removing-stars-from-a-string
3181-find-building-where-alice-and-bob-can-meet

Binary Indexed Tree

3181-find-building-where-alice-and-bob-can-meet

Segment Tree

3181-find-building-where-alice-and-bob-can-meet

Monotonic Stack

0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0316-remove-duplicate-letters
0496-next-greater-element-i
0739-daily-temperatures
1159-smallest-subsequence-of-distinct-characters
3181-find-building-where-alice-and-bob-can-meet

Hash Table

0003-longest-substring-without-repeating-characters
0017-letter-combinations-of-a-phone-number
0041-first-missing-positive
0049-group-anagrams
0128-longest-consecutive-sequence
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0160-intersection-of-two-linked-lists
0169-majority-element
0202-happy-number
0205-isomorphic-strings
0268-missing-number
0347-top-k-frequent-elements
0424-longest-repeating-character-replacement
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0460-lfu-cache
0496-next-greater-element-i
0523-continuous-subarray-sum
0525-contiguous-array
0560-subarray-sum-equals-k
0645-set-mismatch
1016-subarray-sums-divisible-by-k
1169-invalid-transactions
1297-maximum-number-of-balloons
1364-tuple-with-same-product
1632-number-of-good-ways-to-split-a-string
1635-number-of-good-pairs
1915-check-if-one-string-swap-can-make-strings-equal
2059-unique-length-3-palindromic-subsequences
2461-maximum-sum-of-distinct-subarrays-with-length-k
3434-find-the-number-of-distinct-colors-among-the-balls

Divide and Conquer

0004-median-of-two-sorted-arrays
0023-merge-k-sorted-lists
0053-maximum-subarray
0169-majority-element
0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
0948-sort-an-array

Merge Sort

0023-merge-k-sorted-lists
0948-sort-an-array

Bucket Sort

0347-top-k-frequent-elements
0948-sort-an-array

Radix Sort

0948-sort-an-array

Counting Sort

0169-majority-element
0347-top-k-frequent-elements
0948-sort-an-array
1297-maximum-number-of-balloons
1364-tuple-with-same-product
1635-number-of-good-pairs
1915-check-if-one-string-swap-can-make-strings-equal

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0032-longest-valid-parentheses
0049-group-anagrams
0091-decode-ways
0205-isomorphic-strings
0224-basic-calculator
0316-remove-duplicate-letters
0392-is-subsequence
0424-longest-repeating-character-replacement
1128-remove-all-adjacent-duplicates-in-string
1159-smallest-subsequence-of-distinct-characters
1169-invalid-transactions
1297-maximum-number-of-balloons
1537-maximum-score-after-splitting-a-string
1632-number-of-good-ways-to-split-a-string
1700-minimum-time-to-make-rope-colorful
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1915-check-if-one-string-swap-can-make-strings-equal
2059-unique-length-3-palindromic-subsequences
2465-shifting-letters-ii
2470-removing-stars-from-a-string
2691-count-vowel-strings-in-ranges

Union Find

0128-longest-consecutive-sequence

Design

0146-lru-cache
0295-find-median-from-data-stream
0303-range-sum-query-immutable
0460-lfu-cache

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0023-merge-k-sorted-lists
0061-rotate-list
0092-reverse-linked-list-ii
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0160-intersection-of-two-linked-lists
0206-reverse-linked-list
0234-palindrome-linked-list
0460-lfu-cache
0908-middle-of-the-linked-list

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0206-reverse-linked-list
0224-basic-calculator
0234-palindrome-linked-list

Matrix

0054-spiral-matrix
0074-search-a-2d-matrix

Doubly-Linked List

0146-lru-cache
0460-lfu-cache

Memoization

0070-climbing-stairs

Quickselect

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

Data Stream

0295-find-median-from-data-stream