LeetCode

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

LeetCode Topics

Array

0001-two-sum
0004-median-of-two-sorted-arrays
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
0042-trapping-rain-water
0048-rotate-image
0051-n-queens
0053-maximum-subarray
0054-spiral-matrix
0056-merge-intervals
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
0088-merge-sorted-array
0090-subsets-ii
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0136-single-number
0139-word-break
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0169-majority-element
0189-rotate-array
0204-count-primes
0216-combination-sum-iii
0229-majority-element-ii
0240-search-a-2d-matrix-ii
0268-missing-number
0283-move-zeroes
0410-split-array-largest-sum
0485-max-consecutive-ones
0493-reverse-pairs
0496-next-greater-element-i
0503-next-greater-element-ii
0540-single-element-in-a-sorted-array
0560-subarray-sum-equals-k
0735-asteroid-collision
0792-binary-search
0882-peak-index-in-a-mountain-array
0907-koko-eating-bananas
0943-sum-of-subarray-minimums
1056-capacity-to-ship-packages-within-d-days
1408-find-the-smallest-divisor-given-a-threshold
1478-maximum-number-of-events-that-can-be-attended
1510-find-lucky-integer-in-an-array
1605-minimum-number-of-days-to-make-m-bouquets
1646-kth-missing-positive-number
1851-maximum-number-of-events-that-can-be-attended-ii
1878-check-if-array-is-sorted-and-rotated
1995-finding-pairs-with-a-certain-sum
2047-find-a-peak-element-ii
2227-sum-of-subarray-ranges
2271-rearrange-array-elements-by-sign
3743-reschedule-meetings-for-maximum-free-time-i

Hash Table

0001-two-sum
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0037-sudoku-solver
0073-set-matrix-zeroes
0138-copy-list-with-random-pointer
0139-word-break
0141-linked-list-cycle
0142-linked-list-cycle-ii
0160-intersection-of-two-linked-lists
0169-majority-element
0205-isomorphic-strings
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0451-sort-characters-by-frequency
0496-next-greater-element-i
0560-subarray-sum-equals-k
1510-find-lucky-integer-in-an-array
1890-sum-of-beauty-of-all-substrings
1995-finding-pairs-with-a-certain-sum

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
0074-search-a-2d-matrix
0081-search-in-rotated-sorted-array-ii
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0240-search-a-2d-matrix-ii
0268-missing-number
0410-split-array-largest-sum
0493-reverse-pairs
0540-single-element-in-a-sorted-array
0792-binary-search
0882-peak-index-in-a-mountain-array
0907-koko-eating-bananas
1056-capacity-to-ship-packages-within-d-days
1408-find-the-smallest-divisor-given-a-threshold
1605-minimum-number-of-days-to-make-m-bouquets
1646-kth-missing-positive-number
1851-maximum-number-of-events-that-can-be-attended-ii
2047-find-a-peak-element-ii

Two Pointers

0005-longest-palindromic-substring
0015-3sum
0018-4sum
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0031-next-permutation
0042-trapping-rain-water
0061-rotate-list
0075-sort-colors
0088-merge-sorted-array
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
0908-middle-of-the-linked-list
2216-delete-the-middle-node-of-a-linked-list
2271-rearrange-array-elements-by-sign

Math

0002-add-two-numbers
0013-roman-to-integer
0029-divide-two-integers
0048-rotate-image
0050-powx-n
0066-plus-one
0189-rotate-array
0204-count-primes
0231-power-of-two
0268-missing-number
0282-expression-add-operators
2032-largest-odd-number-in-string
2050-count-good-numbers
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii

Bit Manipulation

0029-divide-two-integers
0078-subsets
0090-subsets-ii
0136-single-number
0231-power-of-two
0268-missing-number
2323-minimum-bit-flips-to-convert-number
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii

Sorting

0015-3sum
0018-4sum
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
0451-sort-characters-by-frequency
1478-maximum-number-of-events-that-can-be-attended
1851-maximum-number-of-events-that-can-be-attended-ii

Dynamic Programming

0005-longest-palindromic-substring
0022-generate-parentheses
0042-trapping-rain-water
0053-maximum-subarray
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0131-palindrome-partitioning
0139-word-break
0152-maximum-product-subarray
0410-split-array-largest-sum
0943-sum-of-subarray-minimums
1851-maximum-number-of-events-that-can-be-attended-ii

Divide and Conquer

0004-median-of-two-sorted-arrays
0053-maximum-subarray
0148-sort-list
0169-majority-element
0240-search-a-2d-matrix-ii
0493-reverse-pairs

Counting

0169-majority-element
0229-majority-element-ii
0451-sort-characters-by-frequency
1510-find-lucky-integer-in-an-array
1890-sum-of-beauty-of-all-substrings

String

0005-longest-palindromic-substring
0008-string-to-integer-atoi
0013-roman-to-integer
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0022-generate-parentheses
0079-word-search
0131-palindrome-partitioning
0139-word-break
0151-reverse-words-in-a-string
0205-isomorphic-strings
0242-valid-anagram
0282-expression-add-operators
0402-remove-k-digits
0451-sort-characters-by-frequency
0812-rotate-string
1078-remove-outermost-parentheses
1737-maximum-nesting-depth-of-the-parentheses
1890-sum-of-beauty-of-all-substrings
2032-largest-odd-number-in-string
3617-find-the-original-typed-string-i

Recursion

0002-add-two-numbers
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
3601-find-the-k-th-character-in-string-game-ii

Simulation

0054-spiral-matrix
0735-asteroid-collision
2271-rearrange-array-elements-by-sign
3600-find-the-k-th-character-in-string-game-i

Design

0155-min-stack
0225-implement-stack-using-queues
0232-implement-queue-using-stacks
1995-finding-pairs-with-a-certain-sum

Greedy

0402-remove-k-digits
0410-split-array-largest-sum
1478-maximum-number-of-events-that-can-be-attended
2032-largest-odd-number-in-string
3743-reschedule-meetings-for-maximum-free-time-i

Heap (Priority Queue)

0451-sort-characters-by-frequency
1478-maximum-number-of-events-that-can-be-attended

Sliding Window

3743-reschedule-meetings-for-maximum-free-time-i

Matrix

0037-sudoku-solver
0048-rotate-image
0054-spiral-matrix
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0240-search-a-2d-matrix-ii
2047-find-a-peak-element-ii

Prefix Sum

0410-split-array-largest-sum
0560-subarray-sum-equals-k

Binary Indexed Tree

0493-reverse-pairs

Segment Tree

0493-reverse-pairs

Merge Sort

0148-sort-list
0493-reverse-pairs

Ordered Set

0493-reverse-pairs

Stack

0020-valid-parentheses
0042-trapping-rain-water
0155-min-stack
0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0234-palindrome-linked-list
0402-remove-k-digits
0496-next-greater-element-i
0503-next-greater-element-ii
0735-asteroid-collision
0943-sum-of-subarray-minimums
1078-remove-outermost-parentheses
1737-maximum-nesting-depth-of-the-parentheses
2227-sum-of-subarray-ranges

Trie

0014-longest-common-prefix
0139-word-break

String Matching

0812-rotate-string

Bucket Sort

0451-sort-characters-by-frequency

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0025-reverse-nodes-in-k-group
0061-rotate-list
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0142-linked-list-cycle-ii
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
0908-middle-of-the-linked-list
2216-delete-the-middle-node-of-a-linked-list

Backtracking

0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0051-n-queens
0078-subsets
0079-word-search
0090-subsets-ii
0131-palindrome-partitioning
0216-combination-sum-iii
0282-expression-add-operators

Depth-First Search

0079-word-search

Memoization

0139-word-break

Enumeration

0204-count-primes

Number Theory

0204-count-primes

Queue

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

Monotonic Stack

0042-trapping-rain-water
0402-remove-k-digits
0496-next-greater-element-i
0503-next-greater-element-ii
0943-sum-of-subarray-minimums
2227-sum-of-subarray-ranges