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leetcode

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

LeetCode Topics

Math

0012-integer-to-roman
0013-roman-to-integer
0062-unique-paths
0070-climbing-stairs
0189-rotate-array
0258-add-digits
0268-missing-number
0368-largest-divisible-subset
1013-fibonacci-number
1236-n-th-tribonacci-number
1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
1635-number-of-good-pairs
1642-water-bottles
1993-sum-of-all-subset-xor-totals
2032-largest-odd-number-in-string
2129-number-of-pairs-of-interchangeable-rectangles
2649-count-total-number-of-colored-cells
3001-apply-operations-to-maximize-score
3227-find-missing-and-repeated-values

Dynamic Programming

0042-trapping-rain-water
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0062-unique-paths
0063-unique-paths-ii
0064-minimum-path-sum
0070-climbing-stairs
0072-edit-distance
0115-distinct-subsequences
0120-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0188-best-time-to-buy-and-sell-stock-iv
0198-house-robber
0213-house-robber-ii
0300-longest-increasing-subsequence
0309-best-time-to-buy-and-sell-stock-with-cooldown
0368-largest-divisible-subset
0392-is-subsequence
0410-split-array-largest-sum
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0516-longest-palindromic-subsequence
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0741-cherry-pickup
0747-min-cost-climbing-stairs
0803-cheapest-flights-within-k-stops
0905-length-of-longest-fibonacci-subsequence
0967-minimum-falling-path-sum
1013-fibonacci-number
1170-shortest-common-supersequence
1236-n-th-tribonacci-number
1250-longest-common-subsequence
1352-maximum-profit-in-job-scheduling
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1559-cherry-pickup-ii
1631-number-of-sub-arrays-with-odd-sum
1849-maximum-absolute-sum-of-any-subarray
2090-number-of-ways-to-arrive-at-destination
2262-solving-questions-with-brainpower

Recursion

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

Memoization

0070-climbing-stairs
1013-fibonacci-number
1236-n-th-tribonacci-number

Array

0001-two-sum
0011-container-with-most-water
0015-3sum
0016-3sum-closest
0026-remove-duplicates-from-sorted-array
0027-remove-element
0031-next-permutation
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0039-combination-sum
0040-combination-sum-ii
0042-trapping-rain-water
0045-jump-game-ii
0051-n-queens
0053-maximum-subarray
0055-jump-game
0063-unique-paths-ii
0064-minimum-path-sum
0074-search-a-2d-matrix
0075-sort-colors
0078-subsets
0088-merge-sorted-array
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
0123-best-time-to-buy-and-sell-stock-iii
0136-single-number
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0169-majority-element
0188-best-time-to-buy-and-sell-stock-iv
0189-rotate-array
0198-house-robber
0213-house-robber-ii
0216-combination-sum-iii
0240-search-a-2d-matrix-ii
0268-missing-number
0283-move-zeroes
0287-find-the-duplicate-number
0300-longest-increasing-subsequence
0309-best-time-to-buy-and-sell-stock-with-cooldown
0368-largest-divisible-subset
0410-split-array-largest-sum
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0455-assign-cookies
0485-max-consecutive-ones
0496-next-greater-element-i
0503-next-greater-element-ii
0713-subarray-product-less-than-k
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0741-cherry-pickup
0747-min-cost-climbing-stairs
0792-binary-search
0905-length-of-longest-fibonacci-subsequence
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0948-sort-an-array
0967-minimum-falling-path-sum
1046-max-consecutive-ones-iii
1056-capacity-to-ship-packages-within-d-days
1127-last-stone-weight
1293-three-consecutive-odds
1352-maximum-profit-in-job-scheduling
1364-tuple-with-same-product
1408-find-the-smallest-divisor-given-a-threshold
1477-product-of-the-last-k-numbers
1538-maximum-points-you-can-obtain-from-cards
1559-cherry-pickup-ii
1605-minimum-number-of-days-to-make-m-bouquets
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1631-number-of-sub-arrays-with-odd-sum
1635-number-of-good-pairs
1646-kth-missing-positive-number
1849-maximum-absolute-sum-of-any-subarray
1878-check-if-array-is-sorted-and-rotated
1927-maximum-ascending-subarray-sum
1993-sum-of-all-subset-xor-totals
2107-find-unique-binary-string
2129-number-of-pairs-of-interchangeable-rectangles
2262-solving-questions-with-brainpower
2265-partition-array-according-to-given-pivot
2271-rearrange-array-elements-by-sign
2277-count-equal-and-divisible-pairs-in-an-array
2308-divide-array-into-equal-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2478-longest-nice-subarray
2551-apply-operations-to-an-array
2564-most-profitable-path-in-a-tree
2588-maximum-number-of-points-from-grid-queries
2614-maximum-count-of-positive-integer-and-negative-integer
2626-count-the-number-of-good-subarrays
2681-put-marbles-in-bags
2690-house-robber-iv
2692-take-gifts-from-the-richest-pile
2707-merge-two-2d-arrays-by-summing-values
2856-count-complete-subarrays-in-an-array
3001-apply-operations-to-maximize-score
3152-maximum-value-of-an-ordered-triplet-ii
3154-maximum-value-of-an-ordered-triplet-i
3227-find-missing-and-repeated-values
3332-minimum-operations-to-exceed-threshold-value-ii
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3430-count-days-without-meetings
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3643-zero-array-transformation-ii
3653-maximum-subarray-sum-with-length-divisible-by-k

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0013-roman-to-integer
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0127-word-ladder
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0169-majority-element
0205-isomorphic-strings
0268-missing-number
0451-sort-characters-by-frequency
0496-next-greater-element-i
0768-partition-labels
0896-smallest-subtree-with-all-the-deepest-nodes
0905-length-of-longest-fibonacci-subsequence
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1160-letter-tile-possibilities
1218-lowest-common-ancestor-of-deepest-leaves
1364-tuple-with-same-product
1387-find-elements-in-a-contaminated-binary-tree
1460-number-of-substrings-containing-all-three-characters
1635-number-of-good-pairs
1915-check-if-one-string-swap-can-make-strings-equal
2107-find-unique-binary-string
2129-number-of-pairs-of-interchangeable-rectangles
2308-divide-array-into-equal-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2626-count-the-number-of-good-subarrays
2707-merge-two-2d-arrays-by-summing-values
2856-count-complete-subarrays-in-an-array
3227-find-missing-and-repeated-values
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3653-maximum-subarray-sum-with-length-divisible-by-k

Counting

0169-majority-element
0451-sort-characters-by-frequency
1160-letter-tile-possibilities
1364-tuple-with-same-product
1635-number-of-good-pairs
1915-check-if-one-string-swap-can-make-strings-equal
2129-number-of-pairs-of-interchangeable-rectangles
2308-divide-array-into-equal-pairs
2614-maximum-count-of-positive-integer-and-negative-integer

Divide and Conquer

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
0169-majority-element
0240-search-a-2d-matrix-ii
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0948-sort-an-array

Stack

0020-valid-parentheses
0042-trapping-rain-water
0094-binary-tree-inorder-traversal
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0496-next-greater-element-i
0503-next-greater-element-ii
0874-backspace-string-compare
1078-remove-outermost-parentheses
1737-maximum-nesting-depth-of-the-parentheses
2456-construct-smallest-number-from-di-string
3001-apply-operations-to-maximize-score

Monotonic Stack

0042-trapping-rain-water
0496-next-greater-element-i
0503-next-greater-element-ii
3001-apply-operations-to-maximize-score

Sorting

0015-3sum
0016-3sum-closest
0075-sort-colors
0088-merge-sorted-array
0169-majority-element
0268-missing-number
0368-largest-divisible-subset
0435-non-overlapping-intervals
0451-sort-characters-by-frequency
0455-assign-cookies
0948-sort-an-array
1352-maximum-profit-in-job-scheduling
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2588-maximum-number-of-points-from-grid-queries
2681-put-marbles-in-bags
3001-apply-operations-to-maximize-score
3430-count-days-without-meetings

String

0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0013-roman-to-integer
0014-longest-common-prefix
0020-valid-parentheses
0038-count-and-say
0072-edit-distance
0115-distinct-subsequences
0127-word-ladder
0151-reverse-words-in-a-string
0205-isomorphic-strings
0392-is-subsequence
0451-sort-characters-by-frequency
0516-longest-palindromic-subsequence
0768-partition-labels
0812-rotate-string
0874-backspace-string-compare
1078-remove-outermost-parentheses
1093-recover-a-tree-from-preorder-traversal
1160-letter-tile-possibilities
1170-shortest-common-supersequence
1250-longest-common-subsequence
1460-number-of-substrings-containing-all-three-characters
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1737-maximum-nesting-depth-of-the-parentheses
1915-check-if-one-string-swap-can-make-strings-equal
2032-largest-odd-number-in-string
2107-find-unique-binary-string
2456-construct-smallest-number-from-di-string
2463-minimum-recolors-to-get-k-consecutive-black-blocks
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii

Simulation

0258-add-digits
0874-backspace-string-compare
1642-water-bottles
2265-partition-array-according-to-given-pivot
2271-rearrange-array-elements-by-sign
2551-apply-operations-to-an-array
2692-take-gifts-from-the-richest-pile
3332-minimum-operations-to-exceed-threshold-value-ii

Two Pointers

0011-container-with-most-water
0015-3sum
0016-3sum-closest
0026-remove-duplicates-from-sorted-array
0027-remove-element
0031-next-permutation
0042-trapping-rain-water
0075-sort-colors
0088-merge-sorted-array
0141-linked-list-cycle
0142-linked-list-cycle-ii
0151-reverse-words-in-a-string
0189-rotate-array
0283-move-zeroes
0287-find-the-duplicate-number
0392-is-subsequence
0455-assign-cookies
0768-partition-labels
0874-backspace-string-compare
0908-middle-of-the-linked-list
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
2265-partition-array-according-to-given-pivot
2271-rearrange-array-elements-by-sign
2551-apply-operations-to-an-array
2588-maximum-number-of-points-from-grid-queries
2707-merge-two-2d-arrays-by-summing-values

Number Theory

0258-add-digits
2129-number-of-pairs-of-interchangeable-rectangles
3001-apply-operations-to-maximize-score

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
0435-non-overlapping-intervals
0455-assign-cookies
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0768-partition-labels
2032-largest-odd-number-in-string
2456-construct-smallest-number-from-di-string
2681-put-marbles-in-bags
3001-apply-operations-to-maximize-score

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
0222-count-complete-tree-nodes
0240-search-a-2d-matrix-ii
0268-missing-number
0287-find-the-duplicate-number
0300-longest-increasing-subsequence
0410-split-array-largest-sum
0713-subarray-product-less-than-k
0792-binary-search
1046-max-consecutive-ones-iii
1056-capacity-to-ship-packages-within-d-days
1352-maximum-profit-in-job-scheduling
1408-find-the-smallest-divisor-given-a-threshold
1605-minimum-number-of-days-to-make-m-bouquets
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1646-kth-missing-positive-number
2614-maximum-count-of-positive-integer-and-negative-integer
2690-house-robber-iv
3643-zero-array-transformation-ii

Matrix

0063-unique-paths-ii
0064-minimum-path-sum
0074-search-a-2d-matrix
0240-search-a-2d-matrix-ii
0741-cherry-pickup
0967-minimum-falling-path-sum
1559-cherry-pickup-ii
2588-maximum-number-of-points-from-grid-queries
3227-find-missing-and-repeated-values

Combinatorics

0062-unique-paths
1993-sum-of-all-subset-xor-totals

Backtracking

0039-combination-sum
0040-combination-sum-ii
0051-n-queens
0052-n-queens-ii
0078-subsets
0113-path-sum-ii
0216-combination-sum-iii
1160-letter-tile-possibilities
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1993-sum-of-all-subset-xor-totals
2107-find-unique-binary-string
2456-construct-smallest-number-from-di-string

Bit Manipulation

0078-subsets
0136-single-number
0222-count-complete-tree-nodes
0268-missing-number
0287-find-the-duplicate-number
1993-sum-of-all-subset-xor-totals
2308-divide-array-into-equal-pairs
2478-longest-nice-subarray
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Tree

0094-binary-tree-inorder-traversal
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
0112-path-sum
0113-path-sum-ii
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0222-count-complete-tree-nodes
0230-kth-smallest-element-in-a-bst
0450-delete-node-in-a-bst
0572-subtree-of-another-tree
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0896-smallest-subtree-with-all-the-deepest-nodes
0904-leaf-similar-trees
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1450-delete-leaves-with-a-given-value
2564-most-profitable-path-in-a-tree

Depth-First Search

0094-binary-tree-inorder-traversal
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0112-path-sum
0113-path-sum-ii
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0230-kth-smallest-element-in-a-bst
0572-subtree-of-another-tree
0744-network-delay-time
0803-cheapest-flights-within-k-stops
0896-smallest-subtree-with-all-the-deepest-nodes
0904-leaf-similar-trees
1093-recover-a-tree-from-preorder-traversal
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1450-delete-leaves-with-a-given-value
2564-most-profitable-path-in-a-tree
2793-count-the-number-of-complete-components

Binary Tree

0094-binary-tree-inorder-traversal
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
0112-path-sum
0113-path-sum-ii
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0222-count-complete-tree-nodes
0230-kth-smallest-element-in-a-bst
0450-delete-node-in-a-bst
0572-subtree-of-another-tree
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0896-smallest-subtree-with-all-the-deepest-nodes
0904-leaf-similar-trees
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1450-delete-leaves-with-a-given-value

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
0112-path-sum
0127-word-ladder
0744-network-delay-time
0803-cheapest-flights-within-k-stops
0896-smallest-subtree-with-all-the-deepest-nodes
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
2564-most-profitable-path-in-a-tree
2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components

Heap (Priority Queue)

0023-merge-k-sorted-lists
0451-sort-characters-by-frequency
0744-network-delay-time
0803-cheapest-flights-within-k-stops
0948-sort-an-array
1127-last-stone-weight
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2588-maximum-number-of-points-from-grid-queries
2681-put-marbles-in-bags
2692-take-gifts-from-the-richest-pile
3332-minimum-operations-to-exceed-threshold-value-ii

Design

0146-lru-cache
0838-design-linked-list
1387-find-elements-in-a-contaminated-binary-tree
1477-product-of-the-last-k-numbers

Data Stream

1477-product-of-the-last-k-numbers

Prefix Sum

0410-split-array-largest-sum
0713-subarray-product-less-than-k
1046-max-consecutive-ones-iii
1477-product-of-the-last-k-numbers
1538-maximum-points-you-can-obtain-from-cards
1631-number-of-sub-arrays-with-odd-sum
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3643-zero-array-transformation-ii
3653-maximum-subarray-sum-with-length-divisible-by-k

Linked List

0021-merge-two-sorted-lists
0023-merge-k-sorted-lists
0083-remove-duplicates-from-sorted-list
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0206-reverse-linked-list
0237-delete-node-in-a-linked-list
0838-design-linked-list
0908-middle-of-the-linked-list

Merge Sort

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

String Matching

0572-subtree-of-another-tree
0812-rotate-string

Hash Function

0572-subtree-of-another-tree

Graph

0744-network-delay-time
0803-cheapest-flights-within-k-stops
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
2090-number-of-ways-to-arrive-at-destination
2564-most-profitable-path-in-a-tree
2793-count-the-number-of-complete-components

Binary Search Tree

0230-kth-smallest-element-in-a-bst
0450-delete-node-in-a-bst
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree

Trie

0014-longest-common-prefix

Bucket Sort

0451-sort-characters-by-frequency
0948-sort-an-array

Sliding Window

0003-longest-substring-without-repeating-characters
0713-subarray-product-less-than-k
1046-max-consecutive-ones-iii
1460-number-of-substrings-containing-all-three-characters
1538-maximum-points-you-can-obtain-from-cards
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2478-longest-nice-subarray
2626-count-the-number-of-good-subarrays
2856-count-complete-subarrays-in-an-array
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii

Queue

3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Union Find

2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components

Topological Sort

2090-number-of-ways-to-arrive-at-destination

Shortest Path

0744-network-delay-time
0803-cheapest-flights-within-k-stops
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
2090-number-of-ways-to-arrive-at-destination

Database

0584-find-customer-referee
0595-big-countries
0610-triangle-judgement
0626-exchange-seats
1135-customers-who-bought-all-products
1136-actors-and-directors-who-cooperated-at-least-three-times
1153-product-sales-analysis-i
1258-article-views-i
1268-market-analysis-i
1509-replace-employee-id-with-the-unique-identifier
1724-customer-who-visited-but-did-not-make-any-transactions
1908-recyclable-and-low-fat-products
2087-confirmation-rate
2127-employees-whose-manager-left-the-company
3803-find-products-with-valid-serial-numbers

Enumeration

1993-sum-of-all-subset-xor-totals

Radix Sort

0948-sort-an-array

Counting Sort

0948-sort-an-array

Doubly-Linked List

0146-lru-cache

About

A collection of LeetCode questions to ace the coding interview! - Created using [LeetHub v2](https://github.com/arunbhardwaj/LeetHub-2.0)

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