leetcode

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

LeetCode Topics

Array


0001-two-sum
0004-median-of-two-sorted-arrays
0026-remove-duplicates-from-sorted-array
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
0042-trapping-rain-water
0045-jump-game-ii
0046-permutations
0047-permutations-ii
0048-rotate-image
0049-group-anagrams
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0057-insert-interval
0063-unique-paths-ii
0064-minimum-path-sum
0066-plus-one
0068-text-justification
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0080-remove-duplicates-from-sorted-array-ii
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0120-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0128-longest-consecutive-sequence
0130-surrounded-regions
0134-gas-station
0135-candy
0136-single-number
0137-single-number-ii
0139-word-break
0149-max-points-on-a-line
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0169-majority-element
0189-rotate-array
0198-house-robber
0200-number-of-islands
0209-minimum-size-subarray-sum
0212-word-search-ii
0215-kth-largest-element-in-an-array
0228-summary-ranges
0238-product-of-array-except-self
0274-h-index
0289-game-of-life
0300-longest-increasing-subsequence
0322-coin-change
0380-insert-delete-getrandom-o1
0399-evaluate-division
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
0772-construct-quad-tree
0945-snakes-and-ladders
0954-maximum-sum-circular-subarray
1700-minimum-time-to-make-rope-colorful

Two Pointers


0005-longest-palindromic-substring
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0027-remove-element
0042-trapping-rain-water
0061-rotate-list
0080-remove-duplicates-from-sorted-array-ii
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0125-valid-palindrome
0141-linked-list-cycle
0148-sort-list
0151-reverse-words-in-a-string
0189-rotate-array
0202-happy-number
0295-find-median-from-data-stream
0392-is-subsequence

Depth-First Search


0104-maximum-depth-of-binary-tree
0112-path-sum
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0129-sum-root-to-leaf-numbers
0130-surrounded-regions
0133-clone-graph
0200-number-of-islands
0207-course-schedule
0211-design-add-and-search-words-data-structure
0226-invert-binary-tree
0236-lowest-common-ancestor-of-a-binary-tree
0399-evaluate-division
0530-minimum-absolute-difference-in-bst

Breadth-First Search


0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0112-path-sum
0117-populating-next-right-pointers-in-each-node-ii
0127-word-ladder
0130-surrounded-regions
0133-clone-graph
0200-number-of-islands
0207-course-schedule
0226-invert-binary-tree
0279-perfect-squares
0322-coin-change
0399-evaluate-division
0433-minimum-genetic-mutation
0530-minimum-absolute-difference-in-bst
0945-snakes-and-ladders

Union Find


0128-longest-consecutive-sequence
0130-surrounded-regions
0200-number-of-islands
0399-evaluate-division

Matrix


0036-valid-sudoku
0048-rotate-image
0054-spiral-matrix
0063-unique-paths-ii
0064-minimum-path-sum
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0130-surrounded-regions
0200-number-of-islands
0212-word-search-ii
0289-game-of-life
0772-construct-quad-tree
0945-snakes-and-ladders

Hash Table


0001-two-sum
0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0030-substring-with-concatenation-of-all-words
0036-valid-sudoku
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
0127-word-ladder
0128-longest-consecutive-sequence
0133-clone-graph
0138-copy-list-with-random-pointer
0139-word-break
0141-linked-list-cycle
0146-lru-cache
0149-max-points-on-a-line
0169-majority-element
0202-happy-number
0205-isomorphic-strings
0208-implement-trie-prefix-tree
0242-valid-anagram
0290-word-pattern
0380-insert-delete-getrandom-o1
0433-minimum-genetic-mutation

Graph


0133-clone-graph
0207-course-schedule
0399-evaluate-division
2379-maximum-total-importance-of-roads

String


0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0012-integer-to-roman
0013-roman-to-integer
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0030-substring-with-concatenation-of-all-words
0049-group-anagrams
0058-length-of-last-word
0067-add-binary
0068-text-justification
0072-edit-distance
0076-minimum-window-substring
0079-word-search
0097-interleaving-string
0125-valid-palindrome
0127-word-ladder
0139-word-break
0151-reverse-words-in-a-string
0205-isomorphic-strings
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0212-word-search-ii
0227-basic-calculator-ii
0242-valid-anagram
0290-word-pattern
0392-is-subsequence
0399-evaluate-division
0433-minimum-genetic-mutation
1700-minimum-time-to-make-rope-colorful

Shortest Path


0399-evaluate-division

Topological Sort


0207-course-schedule

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
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0209-minimum-size-subarray-sum
0222-count-complete-tree-nodes
0300-longest-increasing-subsequence

Tree


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
0112-path-sum
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0129-sum-root-to-leaf-numbers
0173-binary-search-tree-iterator
0222-count-complete-tree-nodes
0226-invert-binary-tree
0236-lowest-common-ancestor-of-a-binary-tree
0450-delete-node-in-a-bst
0530-minimum-absolute-difference-in-bst
0772-construct-quad-tree

Binary Tree


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
0112-path-sum
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0129-sum-root-to-leaf-numbers
0173-binary-search-tree-iterator
0222-count-complete-tree-nodes
0226-invert-binary-tree
0236-lowest-common-ancestor-of-a-binary-tree
0450-delete-node-in-a-bst
0530-minimum-absolute-difference-in-bst

Trie


0014-longest-common-prefix
0139-word-break
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0212-word-search-ii

Math


0002-add-two-numbers
0009-palindrome-number
0012-integer-to-roman
0013-roman-to-integer
0048-rotate-image
0050-powx-n
0066-plus-one
0067-add-binary
0069-sqrtx
0070-climbing-stairs
0149-max-points-on-a-line
0172-factorial-trailing-zeroes
0189-rotate-array
0202-happy-number
0227-basic-calculator-ii
0279-perfect-squares
0380-insert-delete-getrandom-o1

Bit Manipulation


0067-add-binary
0136-single-number
0137-single-number-ii
0190-reverse-bits
0191-number-of-1-bits
0222-count-complete-tree-nodes

Divide and Conquer


0004-median-of-two-sorted-arrays
0023-merge-k-sorted-lists
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
0190-reverse-bits
0191-number-of-1-bits
0215-kth-largest-element-in-an-array
0772-construct-quad-tree
0954-maximum-sum-circular-subarray

Linked List


0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0023-merge-k-sorted-lists
0025-reverse-nodes-in-k-group
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0092-reverse-linked-list-ii
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0146-lru-cache
0148-sort-list

Sorting


0049-group-anagrams
0056-merge-intervals
0148-sort-list
0169-majority-element
0215-kth-largest-element-in-an-array
0242-valid-anagram
0274-h-index
0295-find-median-from-data-stream
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
2379-maximum-total-importance-of-roads

Counting Sort


0169-majority-element
0274-h-index

Stack


0042-trapping-rain-water
0114-flatten-binary-tree-to-linked-list
0173-binary-search-tree-iterator
0227-basic-calculator-ii

Design


0146-lru-cache
0173-binary-search-tree-iterator
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0295-find-median-from-data-stream
0380-insert-delete-getrandom-o1

Binary Search Tree


0173-binary-search-tree-iterator
0450-delete-node-in-a-bst
0530-minimum-absolute-difference-in-bst

Iterator


0173-binary-search-tree-iterator

Dynamic Programming


0005-longest-palindromic-substring
0022-generate-parentheses
0042-trapping-rain-water
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0063-unique-paths-ii
0064-minimum-path-sum
0070-climbing-stairs
0072-edit-distance
0097-interleaving-string
0120-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0124-binary-tree-maximum-path-sum
0139-word-break
0198-house-robber
0279-perfect-squares
0300-longest-increasing-subsequence
0322-coin-change
0392-is-subsequence
0954-maximum-sum-circular-subarray
1700-minimum-time-to-make-rope-colorful

Greedy


0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0134-gas-station
0135-candy
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
1700-minimum-time-to-make-rope-colorful
2379-maximum-total-importance-of-roads

Recursion


0002-add-two-numbers
0021-merge-two-sorted-lists
0025-reverse-nodes-in-k-group
0050-powx-n

Heap (Priority Queue)


0023-merge-k-sorted-lists
0215-kth-largest-element-in-an-array
0295-find-median-from-data-stream
0502-ipo
2379-maximum-total-importance-of-roads

Quickselect


0215-kth-largest-element-in-an-array

Randomized


0380-insert-delete-getrandom-o1

Prefix Sum


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

Monotonic Stack


0042-trapping-rain-water

Doubly-Linked List


0146-lru-cache

Simulation


0054-spiral-matrix
0067-add-binary
0068-text-justification
0289-game-of-life

Memoization


0070-climbing-stairs
0139-word-break

Sliding Window


0003-longest-substring-without-repeating-characters
0030-substring-with-concatenation-of-all-words
0076-minimum-window-substring
0209-minimum-size-subarray-sum

Backtracking


0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0039-combination-sum
0046-permutations
0047-permutations-ii
0052-n-queens-ii
0077-combinations
0079-word-search
0212-word-search-ii

Merge Sort


0023-merge-k-sorted-lists
0148-sort-list

Queue


0954-maximum-sum-circular-subarray

Monotonic Queue


0954-maximum-sum-circular-subarray

Data Stream


0295-find-median-from-data-stream

Geometry


0149-max-points-on-a-line

Name		Name	Last commit message	Last commit date
Latest commit History 837 Commits
0001-two-sum		0001-two-sum
0002-add-two-numbers		0002-add-two-numbers
0003-longest-substring-without-repeating-characters		0003-longest-substring-without-repeating-characters
0004-median-of-two-sorted-arrays		0004-median-of-two-sorted-arrays
0005-longest-palindromic-substring		0005-longest-palindromic-substring
0006-zigzag-conversion		0006-zigzag-conversion
0009-palindrome-number		0009-palindrome-number
0012-integer-to-roman		0012-integer-to-roman
0013-roman-to-integer		0013-roman-to-integer
0014-longest-common-prefix		0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number		0017-letter-combinations-of-a-phone-number
0019-remove-nth-node-from-end-of-list		0019-remove-nth-node-from-end-of-list
0020-valid-parentheses		0020-valid-parentheses
0021-merge-two-sorted-lists		0021-merge-two-sorted-lists
0022-generate-parentheses		0022-generate-parentheses
0023-merge-k-sorted-lists		0023-merge-k-sorted-lists
0025-reverse-nodes-in-k-group		0025-reverse-nodes-in-k-group
0026-remove-duplicates-from-sorted-array		0026-remove-duplicates-from-sorted-array
0027-remove-element		0027-remove-element
0030-substring-with-concatenation-of-all-words		0030-substring-with-concatenation-of-all-words
0033-search-in-rotated-sorted-array		0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array		0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position		0035-search-insert-position
0036-valid-sudoku		0036-valid-sudoku
0039-combination-sum		0039-combination-sum
0042-trapping-rain-water		0042-trapping-rain-water
0045-jump-game-ii		0045-jump-game-ii
0046-permutations		0046-permutations
0047-permutations-ii		0047-permutations-ii
0048-rotate-image		0048-rotate-image
0049-group-anagrams		0049-group-anagrams
0050-powx-n		0050-powx-n
0052-n-queens-ii		0052-n-queens-ii
0053-maximum-subarray		0053-maximum-subarray
0054-spiral-matrix		0054-spiral-matrix
0055-jump-game		0055-jump-game
0056-merge-intervals		0056-merge-intervals
0057-insert-interval		0057-insert-interval
0058-length-of-last-word		0058-length-of-last-word
0061-rotate-list		0061-rotate-list
0063-unique-paths-ii		0063-unique-paths-ii
0064-minimum-path-sum		0064-minimum-path-sum
0066-plus-one		0066-plus-one
0067-add-binary		0067-add-binary
0068-text-justification		0068-text-justification
0069-sqrtx		0069-sqrtx
0070-climbing-stairs		0070-climbing-stairs
0072-edit-distance		0072-edit-distance
0073-set-matrix-zeroes		0073-set-matrix-zeroes
0074-search-a-2d-matrix		0074-search-a-2d-matrix
0076-minimum-window-substring		0076-minimum-window-substring
0077-combinations		0077-combinations
0079-word-search		0079-word-search
0080-remove-duplicates-from-sorted-array-ii		0080-remove-duplicates-from-sorted-array-ii
0082-remove-duplicates-from-sorted-list-ii		0082-remove-duplicates-from-sorted-list-ii
0086-partition-list		0086-partition-list
0088-merge-sorted-array		0088-merge-sorted-array
0092-reverse-linked-list-ii		0092-reverse-linked-list-ii
0097-interleaving-string		0097-interleaving-string
0100-same-tree		0100-same-tree
0101-symmetric-tree		0101-symmetric-tree
0103-binary-tree-zigzag-level-order-traversal		0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree		0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal		0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal		0106-construct-binary-tree-from-inorder-and-postorder-traversal
0112-path-sum		0112-path-sum
0114-flatten-binary-tree-to-linked-list		0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii		0117-populating-next-right-pointers-in-each-node-ii
0120-triangle		0120-triangle
0121-best-time-to-buy-and-sell-stock		0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii		0122-best-time-to-buy-and-sell-stock-ii
0124-binary-tree-maximum-path-sum		0124-binary-tree-maximum-path-sum
0125-valid-palindrome		0125-valid-palindrome
0127-word-ladder		0127-word-ladder
0128-longest-consecutive-sequence		0128-longest-consecutive-sequence
0129-sum-root-to-leaf-numbers		0129-sum-root-to-leaf-numbers
0130-surrounded-regions		0130-surrounded-regions
0133-clone-graph		0133-clone-graph
0134-gas-station		0134-gas-station
0135-candy		0135-candy
0136-single-number		0136-single-number
0137-single-number-ii		0137-single-number-ii
0138-copy-list-with-random-pointer		0138-copy-list-with-random-pointer
0139-word-break		0139-word-break
0141-linked-list-cycle		0141-linked-list-cycle
0146-lru-cache		0146-lru-cache
0148-sort-list		0148-sort-list
0149-max-points-on-a-line		0149-max-points-on-a-line
0151-reverse-words-in-a-string		0151-reverse-words-in-a-string
0153-find-minimum-in-rotated-sorted-array		0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element		0162-find-peak-element
0169-majority-element		0169-majority-element
0172-factorial-trailing-zeroes		0172-factorial-trailing-zeroes
0173-binary-search-tree-iterator		0173-binary-search-tree-iterator
0189-rotate-array		0189-rotate-array
0190-reverse-bits		0190-reverse-bits
0191-number-of-1-bits		0191-number-of-1-bits
0198-house-robber		0198-house-robber
0199-binary-tree-right-side-view		0199-binary-tree-right-side-view
0200-number-of-islands		0200-number-of-islands

bilet-13/leetcode

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leetcode

LeetCode Topics

Array

Two Pointers

Depth-First Search

Breadth-First Search

Union Find

Matrix

Hash Table

Graph

String

Shortest Path

Topological Sort

Binary Search

Tree

Binary Tree

Trie

Math

Bit Manipulation

Divide and Conquer

Linked List

Sorting

Counting Sort

Stack

Design

Binary Search Tree

Iterator

Dynamic Programming

Greedy

Recursion

Heap (Priority Queue)

Quickselect

Randomized

Prefix Sum

Monotonic Stack

Doubly-Linked List

Simulation

Memoization

Sliding Window

Backtracking

Merge Sort

Queue

Monotonic Queue

Data Stream

Geometry

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