leetcode-solutions-repo

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

LeetCode Topics

Math

0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0029-divide-two-integers
0048-rotate-image
0050-powx-n
0066-plus-one
0069-sqrtx
0189-rotate-array
0204-count-primes
0231-power-of-two
0268-missing-number
0556-next-greater-element-iii
1248-count-number-of-nice-subarrays
1370-count-number-of-nice-subarrays
1390-four-divisors
1889-check-if-number-is-a-sum-of-powers-of-three
1903-largest-odd-number-in-string
2050-count-good-numbers
2649-count-total-number-of-colored-cells
3321-type-of-triangle
3600-find-the-k-th-character-in-string-game-i

Bit Manipulation

0029-divide-two-integers
0078-subsets
0090-subsets-ii
0137-single-number-ii
0222-count-complete-tree-nodes
0231-power-of-two
0260-single-number-iii
0268-missing-number
2059-unique-length-3-palindromic-subsequences
2323-minimum-bit-flips-to-convert-number
2509-minimize-xor
2533-bitwise-xor-of-all-pairings
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
3600-find-the-k-th-character-in-string-game-i

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0025-reverse-nodes-in-k-group
0050-powx-n
0206-reverse-linked-list
0231-power-of-two
0234-palindrome-linked-list
2050-count-good-numbers
3600-find-the-k-th-character-in-string-game-i

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0011-container-with-most-water
0014-longest-common-prefix
0015-3sum
0018-4sum
0026-remove-duplicates-from-sorted-array
0031-next-permutation
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0046-permutations
0047-permutations-ii
0048-rotate-image
0049-group-anagrams
0051-n-queens
0053-maximum-subarray
0055-jump-game
0056-merge-intervals
0057-insert-interval
0066-plus-one
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0075-sort-colors
0078-subsets
0079-word-search
0081-search-in-rotated-sorted-array-ii
0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0088-merge-sorted-array
0090-subsets-ii
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0118-pascals-triangle
0119-pascals-triangle-ii
0128-longest-consecutive-sequence
0135-candy
0137-single-number-ii
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0169-majority-element
0189-rotate-array
0200-number-of-islands
0204-count-primes
0216-combination-sum-iii
0229-majority-element-ii
0239-sliding-window-maximum
0240-search-a-2d-matrix-ii
0260-single-number-iii
0268-missing-number
0283-move-zeroes
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0407-trapping-rain-water-ii
0410-split-array-largest-sum
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0455-assign-cookies
0485-max-consecutive-ones
0493-reverse-pairs
0496-next-greater-element-i
0500-keyboard-row
0503-next-greater-element-ii
0540-single-element-in-a-sorted-array
0560-subarray-sum-equals-k
0611-valid-triangle-number
0704-binary-search
0733-flood-fill
0735-asteroid-collision
0739-daily-temperatures
0792-binary-search
0875-koko-eating-bananas
0878-shifting-letters
0890-lemonade-change
0904-fruit-into-baskets
0907-koko-eating-bananas
0930-binary-subarrays-with-sum
0940-fruit-into-baskets
0943-sum-of-subarray-minimums
0961-n-repeated-element-in-size-2n-array
0966-binary-subarrays-with-sum
0994-rotting-oranges
1004-max-consecutive-ones-iii
1008-construct-binary-search-tree-from-preorder-traversal
1020-number-of-enclaves
1046-max-consecutive-ones-iii
1056-capacity-to-ship-packages-within-d-days
1248-count-number-of-nice-subarrays
1283-find-the-smallest-divisor-given-a-threshold
1364-tuple-with-same-product
1370-count-number-of-nice-subarrays
1390-four-divisors
1396-count-servers-that-communicate
1408-find-the-smallest-divisor-given-a-threshold
1423-maximum-points-you-can-obtain-from-cards
1482-how-many-numbers-are-smaller-than-the-current-number
1524-string-matching-in-an-array
1538-maximum-points-you-can-obtain-from-cards
1605-minimum-number-of-days-to-make-m-bouquets
1646-kth-missing-positive-number
1675-magnetic-force-between-two-balls
1752-check-if-array-is-sorted-and-rotated
1876-map-of-highest-peak
1878-check-if-array-is-sorted-and-rotated
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1927-maximum-ascending-subarray-sum
1966-frequency-of-the-most-frequent-element
1975-maximum-matrix-sum
2047-find-a-peak-element-ii
2145-grid-game
2227-sum-of-subarray-ranges
2265-partition-array-according-to-given-pivot
2271-rearrange-array-elements-by-sign
2292-counting-words-with-a-given-prefix
2302-count-subarrays-with-score-less-than-k
2533-bitwise-xor-of-all-pairings
2551-apply-operations-to-an-array
2685-first-completely-painted-row-or-column
2707-merge-two-2d-arrays-by-summing-values
2737-row-with-maximum-ones
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
3242-count-elements-with-maximum-frequency
3309-count-prefix-and-suffix-pairs-i
3321-type-of-triangle
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3427-special-array-ii
3429-special-array-i
3434-find-the-number-of-distinct-colors-among-the-balls

Binary Search

0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0069-sqrtx
0074-search-a-2d-matrix
0081-search-in-rotated-sorted-array-ii
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0222-count-complete-tree-nodes
0240-search-a-2d-matrix-ii
0268-missing-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0410-split-array-largest-sum
0493-reverse-pairs
0540-single-element-in-a-sorted-array
0611-valid-triangle-number
0704-binary-search
0792-binary-search
0875-koko-eating-bananas
0907-koko-eating-bananas
1004-max-consecutive-ones-iii
1046-max-consecutive-ones-iii
1056-capacity-to-ship-packages-within-d-days
1283-find-the-smallest-divisor-given-a-threshold
1408-find-the-smallest-divisor-given-a-threshold
1605-minimum-number-of-days-to-make-m-bouquets
1646-kth-missing-positive-number
1675-magnetic-force-between-two-balls
1966-frequency-of-the-most-frequent-element
2047-find-a-peak-element-ii
2302-count-subarrays-with-score-less-than-k
3427-special-array-ii

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0017-letter-combinations-of-a-phone-number
0037-sudoku-solver
0049-group-anagrams
0073-set-matrix-zeroes
0076-minimum-window-substring
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0128-longest-consecutive-sequence
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0160-intersection-of-two-linked-lists
0169-majority-element
0205-isomorphic-strings
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0387-first-unique-character-in-a-string
0424-longest-repeating-character-replacement
0496-next-greater-element-i
0500-keyboard-row
0560-subarray-sum-equals-k
0653-two-sum-iv-input-is-a-bst
0863-all-nodes-distance-k-in-binary-tree
0904-fruit-into-baskets
0930-binary-subarrays-with-sum
0940-fruit-into-baskets
0961-n-repeated-element-in-size-2n-array
0966-binary-subarrays-with-sum
1029-vertical-order-traversal-of-a-binary-tree
1248-count-number-of-nice-subarrays
1358-number-of-substrings-containing-all-three-characters
1364-tuple-with-same-product
1370-count-number-of-nice-subarrays
1460-number-of-substrings-containing-all-three-characters
1482-how-many-numbers-are-smaller-than-the-current-number
1502-construct-k-palindrome-strings
1915-check-if-one-string-swap-can-make-strings-equal
2059-unique-length-3-palindromic-subsequences
2385-amount-of-time-for-binary-tree-to-be-infected
2434-design-a-number-container-system
2685-first-completely-painted-row-or-column
2707-merge-two-2d-arrays-by-summing-values
2766-find-the-prefix-common-array-of-two-arrays
3242-count-elements-with-maximum-frequency
3434-find-the-number-of-distinct-colors-among-the-balls
3455-minimum-length-of-string-after-operations

Two Pointers

0011-container-with-most-water
0015-3sum
0018-4sum
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0031-next-permutation
0061-rotate-list
0075-sort-colors
0082-remove-duplicates-from-sorted-list-ii
0088-merge-sorted-array
0125-valid-palindrome
0141-linked-list-cycle
0142-linked-list-cycle-ii
0148-sort-list
0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists
0189-rotate-array
0234-palindrome-linked-list
0283-move-zeroes
0344-reverse-string
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0455-assign-cookies
0556-next-greater-element-iii
0611-valid-triangle-number
0653-two-sum-iv-input-is-a-bst
0876-middle-of-the-linked-list
0908-middle-of-the-linked-list
2095-delete-the-middle-node-of-a-linked-list
2216-delete-the-middle-node-of-a-linked-list
2265-partition-array-according-to-given-pivot
2271-rearrange-array-elements-by-sign
2551-apply-operations-to-an-array
2707-merge-two-2d-arrays-by-summing-values

Sorting

0015-3sum
0018-4sum
0047-permutations-ii
0049-group-anagrams
0056-merge-intervals
0075-sort-colors
0088-merge-sorted-array
0148-sort-list
0169-majority-element
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0435-non-overlapping-intervals
0455-assign-cookies
0611-valid-triangle-number
1029-vertical-order-traversal-of-a-binary-tree
1482-how-many-numbers-are-smaller-than-the-current-number
1675-magnetic-force-between-two-balls
1966-frequency-of-the-most-frequent-element
3321-type-of-triangle

Simulation

0735-asteroid-collision
2265-partition-array-according-to-given-pivot
2271-rearrange-array-elements-by-sign
2551-apply-operations-to-an-array
3434-find-the-number-of-distinct-colors-among-the-balls
3600-find-the-k-th-character-in-string-game-i

Dynamic Programming

0022-generate-parentheses
0053-maximum-subarray
0055-jump-game
0085-maximal-rectangle
0118-pascals-triangle
0119-pascals-triangle-ii
0124-binary-tree-maximum-path-sum
0131-palindrome-partitioning
0152-maximum-product-subarray
0410-split-array-largest-sum
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0943-sum-of-subarray-minimums
1411-number-of-ways-to-paint-n-3-grid
1931-painting-a-grid-with-three-different-colors

Union Find

0128-longest-consecutive-sequence
1396-count-servers-that-communicate

Matrix

0037-sudoku-solver
0048-rotate-image
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0085-maximal-rectangle
0200-number-of-islands
0240-search-a-2d-matrix-ii
0407-trapping-rain-water-ii
0733-flood-fill
0994-rotting-oranges
1020-number-of-enclaves
1396-count-servers-that-communicate
1876-map-of-highest-peak
1975-maximum-matrix-sum
2047-find-a-peak-element-ii
2145-grid-game
2685-first-completely-painted-row-or-column
2737-row-with-maximum-ones

String

0003-longest-substring-without-repeating-characters
0006-zigzag-conversion
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0022-generate-parentheses
0049-group-anagrams
0076-minimum-window-substring
0079-word-search
0125-valid-palindrome
0131-palindrome-partitioning
0151-reverse-words-in-a-string
0205-isomorphic-strings
0242-valid-anagram
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0344-reverse-string
0387-first-unique-character-in-a-string
0402-remove-k-digits
0424-longest-repeating-character-replacement
0500-keyboard-row
0556-next-greater-element-iii
0796-rotate-string
0878-shifting-letters
0916-decoded-string-at-index
0957-minimum-add-to-make-parentheses-valid
1358-number-of-substrings-containing-all-three-characters
1460-number-of-substrings-containing-all-three-characters
1502-construct-k-palindrome-strings
1524-string-matching-in-an-array
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1903-largest-odd-number-in-string
1915-check-if-one-string-swap-can-make-strings-equal
2059-unique-length-3-palindromic-subsequences
2221-check-if-a-parentheses-string-can-be-valid
2292-counting-words-with-a-given-prefix
3309-count-prefix-and-suffix-pairs-i
3455-minimum-length-of-string-after-operations
3617-find-the-original-typed-string-i

Divide and Conquer

0004-median-of-two-sorted-arrays
0053-maximum-subarray
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0148-sort-list
0169-majority-element
0240-search-a-2d-matrix-ii
0493-reverse-pairs

Counting

0169-majority-element
0229-majority-element-ii
0387-first-unique-character-in-a-string
1364-tuple-with-same-product
1396-count-servers-that-communicate
1502-construct-k-palindrome-strings
1915-check-if-one-string-swap-can-make-strings-equal
3242-count-elements-with-maximum-frequency
3455-minimum-length-of-string-after-operations

Prefix Sum

0410-split-array-largest-sum
0560-subarray-sum-equals-k
0878-shifting-letters
0930-binary-subarrays-with-sum
0966-binary-subarrays-with-sum
1004-max-consecutive-ones-iii
1046-max-consecutive-ones-iii
1248-count-number-of-nice-subarrays
1370-count-number-of-nice-subarrays
1423-maximum-points-you-can-obtain-from-cards
1538-maximum-points-you-can-obtain-from-cards
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1966-frequency-of-the-most-frequent-element
2059-unique-length-3-palindromic-subsequences
2145-grid-game
2302-count-subarrays-with-score-less-than-k
3427-special-array-ii

String Matching

0796-rotate-string
1524-string-matching-in-an-array
2292-counting-words-with-a-given-prefix
3309-count-prefix-and-suffix-pairs-i

Greedy

0011-container-with-most-water
0055-jump-game
0135-candy
0402-remove-k-digits
0410-split-array-largest-sum
0435-non-overlapping-intervals
0455-assign-cookies
0611-valid-triangle-number
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
1502-construct-k-palindrome-strings
1903-largest-odd-number-in-string
1966-frequency-of-the-most-frequent-element
1975-maximum-matrix-sum
2221-check-if-a-parentheses-string-can-be-valid
2509-minimize-xor

Trie

0014-longest-common-prefix
3309-count-prefix-and-suffix-pairs-i

Rolling Hash

3309-count-prefix-and-suffix-pairs-i

Hash Function

3309-count-prefix-and-suffix-pairs-i

Stack

0020-valid-parentheses
0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0094-binary-tree-inorder-traversal
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0155-min-stack
0173-binary-search-tree-iterator
0234-palindrome-linked-list
0402-remove-k-digits
0496-next-greater-element-i
0503-next-greater-element-ii
0735-asteroid-collision
0739-daily-temperatures
0916-decoded-string-at-index
0943-sum-of-subarray-minimums
0957-minimum-add-to-make-parentheses-valid
1008-construct-binary-search-tree-from-preorder-traversal
2221-check-if-a-parentheses-string-can-be-valid
2227-sum-of-subarray-ranges

Brainteaser

2533-bitwise-xor-of-all-pairings

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
0199-binary-tree-right-side-view
0200-number-of-islands
0297-serialize-and-deserialize-binary-tree
0407-trapping-rain-water-ii
0547-number-of-provinces
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0733-flood-fill
0863-all-nodes-distance-k-in-binary-tree
0994-rotting-oranges
1020-number-of-enclaves
1029-vertical-order-traversal-of-a-binary-tree
1161-maximum-level-sum-of-a-binary-tree
1396-count-servers-that-communicate
1558-course-schedule-iv
1876-map-of-highest-peak
2385-amount-of-time-for-binary-tree-to-be-infected

Heap (Priority Queue)

0239-sliding-window-maximum
0407-trapping-rain-water-ii
0703-kth-largest-element-in-a-stream
2434-design-a-number-container-system

Depth-First Search

0079-word-search
0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0099-recover-binary-search-tree
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
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0200-number-of-islands
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0543-diameter-of-binary-tree
0547-number-of-provinces
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0733-flood-fill
0863-all-nodes-distance-k-in-binary-tree
1020-number-of-enclaves
1029-vertical-order-traversal-of-a-binary-tree
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree
1396-count-servers-that-communicate
1558-course-schedule-iv
2385-amount-of-time-for-binary-tree-to-be-infected

Graph

1558-course-schedule-iv

Topological Sort

1558-course-schedule-iv

Sliding Window

0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
0239-sliding-window-maximum
0424-longest-repeating-character-replacement
0904-fruit-into-baskets
0930-binary-subarrays-with-sum
0940-fruit-into-baskets
0966-binary-subarrays-with-sum
1004-max-consecutive-ones-iii
1046-max-consecutive-ones-iii
1248-count-number-of-nice-subarrays
1358-number-of-substrings-containing-all-three-characters
1370-count-number-of-nice-subarrays
1423-maximum-points-you-can-obtain-from-cards
1460-number-of-substrings-containing-all-three-characters
1538-maximum-points-you-can-obtain-from-cards
1966-frequency-of-the-most-frequent-element
2302-count-subarrays-with-score-less-than-k

Design

0146-lru-cache
0155-min-stack
0173-binary-search-tree-iterator
0297-serialize-and-deserialize-binary-tree
0703-kth-largest-element-in-a-stream
2434-design-a-number-container-system

Ordered Set

0493-reverse-pairs
2434-design-a-number-container-system

Backtracking

0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0046-permutations
0047-permutations-ii
0051-n-queens
0077-combinations
0078-subsets
0079-word-search
0090-subsets-ii
0131-palindrome-partitioning
0216-combination-sum-iii
0257-binary-tree-paths

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0025-reverse-nodes-in-k-group
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0083-remove-duplicates-from-sorted-list
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0148-sort-list
0160-intersection-of-two-linked-lists
0206-reverse-linked-list
0234-palindrome-linked-list
0237-delete-node-in-a-linked-list
0328-odd-even-linked-list
0876-middle-of-the-linked-list
0908-middle-of-the-linked-list
2095-delete-the-middle-node-of-a-linked-list
2216-delete-the-middle-node-of-a-linked-list

Merge Sort

0148-sort-list
0493-reverse-pairs

Monotonic Stack

0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0402-remove-k-digits
0496-next-greater-element-i
0503-next-greater-element-ii
0739-daily-temperatures
0943-sum-of-subarray-minimums
1008-construct-binary-search-tree-from-preorder-traversal
2227-sum-of-subarray-ranges

Queue

0239-sliding-window-maximum
0387-first-unique-character-in-a-string

Monotonic Queue

0239-sliding-window-maximum

Doubly-Linked List

0146-lru-cache

Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0099-recover-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
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0110-balanced-binary-tree
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0450-delete-node-in-a-bst
0543-diameter-of-binary-tree
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0700-search-in-a-binary-search-tree
0701-insert-into-a-binary-search-tree
0703-kth-largest-element-in-a-stream
0863-all-nodes-distance-k-in-binary-tree
1008-construct-binary-search-tree-from-preorder-traversal
1029-vertical-order-traversal-of-a-binary-tree
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree
2385-amount-of-time-for-binary-tree-to-be-infected

Binary Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0099-recover-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
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0110-balanced-binary-tree
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0450-delete-node-in-a-bst
0543-diameter-of-binary-tree
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0700-search-in-a-binary-search-tree
0701-insert-into-a-binary-search-tree
0703-kth-largest-element-in-a-stream
0863-all-nodes-distance-k-in-binary-tree
1008-construct-binary-search-tree-from-preorder-traversal
1029-vertical-order-traversal-of-a-binary-tree
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree
2385-amount-of-time-for-binary-tree-to-be-infected

Binary Indexed Tree

0493-reverse-pairs

Segment Tree

0493-reverse-pairs

Counting Sort

1482-how-many-numbers-are-smaller-than-the-current-number

Binary Search Tree

0098-validate-binary-search-tree
0099-recover-binary-search-tree
0173-binary-search-tree-iterator
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0450-delete-node-in-a-bst
0653-two-sum-iv-input-is-a-bst
0700-search-in-a-binary-search-tree
0701-insert-into-a-binary-search-tree
0703-kth-largest-element-in-a-stream
1008-construct-binary-search-tree-from-preorder-traversal

Iterator

0173-binary-search-tree-iterator

Enumeration

0204-count-primes

Number Theory

0204-count-primes

Database

0184-department-highest-salary
0511-game-play-analysis-i
0570-managers-with-at-least-5-direct-reports
0584-find-customer-referee
0596-classes-with-at-least-5-students
0607-sales-person
0620-not-boring-movies
1045-customers-who-bought-all-products
1148-article-views-i
1251-average-selling-price
1280-students-and-examinations
1581-customer-who-visited-but-did-not-make-any-transactions
1633-percentage-of-users-attended-a-contest
1661-average-time-of-process-per-machine
1683-invalid-tweets
1934-confirmation-rate
1978-employees-whose-manager-left-the-company
2356-number-of-unique-subjects-taught-by-each-teacher

Data Stream

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

Union-Find

0200-number-of-islands
0547-number-of-provinces
1020-number-of-enclaves

Graph Theory

0547-number-of-provinces