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A collection of LeetCode questions to ace the coding interviews! - Created using LeetHub 2.0 for Firefox

LeetCode Topics

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0015-3sum
0018-4sum
0035-search-insert-position
0036-valid-sudoku
0039-combination-sum
0045-jump-game-ii
0048-rotate-image
0053-maximum-subarray
0055-jump-game
0056-merge-intervals
0057-insert-interval
0073-set-matrix-zeroes
0078-subsets
0084-largest-rectangle-in-histogram
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0134-gas-station
0135-candy
0150-evaluate-reverse-polish-notation
0162-find-peak-element
0215-kth-largest-element-in-an-array
0216-combination-sum-iii
0228-summary-ranges
0229-majority-element-ii
0274-h-index
0334-increasing-triplet-subsequence
0373-find-k-pairs-with-smallest-sums
0380-insert-delete-getrandom-o1
0435-non-overlapping-intervals
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
0523-continuous-subarray-sum
0621-task-scheduler
0772-construct-quad-tree
0816-design-hashset
0817-design-hashmap
0860-design-circular-queue
0898-transpose-matrix
0907-koko-eating-bananas
1014-k-closest-points-to-origin
1046-max-consecutive-ones-iii
1056-capacity-to-ship-packages-within-d-days
1127-last-stone-weight
1184-car-pooling
1586-longest-subarray-of-1s-after-deleting-one-element
1798-max-number-of-k-sum-pairs
1962-single-threaded-cpu
1993-sum-of-all-subset-xor-totals
2392-successful-pairs-of-spells-and-potions
2428-equal-row-and-column-pairs

Binary Search

0004-median-of-two-sorted-arrays
0035-search-insert-position
0069-sqrtx
0162-find-peak-element
0222-count-complete-tree-nodes
0907-koko-eating-bananas
1046-max-consecutive-ones-iii
1056-capacity-to-ship-packages-within-d-days
2392-successful-pairs-of-spells-and-potions

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0036-valid-sudoku
0073-set-matrix-zeroes
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0138-copy-list-with-random-pointer
0146-lru-cache
0208-implement-trie-prefix-tree
0229-majority-element-ii
0355-design-twitter
0380-insert-delete-getrandom-o1
0523-continuous-subarray-sum
0621-task-scheduler
0768-partition-labels
0778-reorganize-string
0816-design-hashset
0817-design-hashmap
0931-maximum-frequency-stack
1777-determine-if-two-strings-are-close
1798-max-number-of-k-sum-pairs
2428-equal-row-and-column-pairs

Sorting

0015-3sum
0018-4sum
0056-merge-intervals
0147-insertion-sort-list
0148-sort-list
0215-kth-largest-element-in-an-array
0229-majority-element-ii
0274-h-index
0295-find-median-from-data-stream
0435-non-overlapping-intervals
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
0621-task-scheduler
0778-reorganize-string
1014-k-closest-points-to-origin
1184-car-pooling
1777-determine-if-two-strings-are-close
1798-max-number-of-k-sum-pairs
1962-single-threaded-cpu
2392-successful-pairs-of-spells-and-potions

Counting

0229-majority-element-ii
0621-task-scheduler
0778-reorganize-string
1777-determine-if-two-strings-are-close

Matrix

0036-valid-sudoku
0048-rotate-image
0073-set-matrix-zeroes
0772-construct-quad-tree
0898-transpose-matrix
2428-equal-row-and-column-pairs

Linked List

0002-add-two-numbers
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0083-remove-duplicates-from-sorted-list
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
0146-lru-cache
0147-insertion-sort-list
0148-sort-list
0328-odd-even-linked-list
0355-design-twitter
0816-design-hashset
0817-design-hashmap
0838-design-linked-list
0860-design-circular-queue
2236-maximum-twin-sum-of-a-linked-list

Design

0146-lru-cache
0173-binary-search-tree-iterator
0208-implement-trie-prefix-tree
0295-find-median-from-data-stream
0355-design-twitter
0380-insert-delete-getrandom-o1
0789-kth-largest-element-in-a-stream
0816-design-hashset
0817-design-hashmap
0838-design-linked-list
0860-design-circular-queue
0931-maximum-frequency-stack
0969-number-of-recent-calls

Hash Function

0572-subtree-of-another-tree
0816-design-hashset
0817-design-hashmap

Stack

0084-largest-rectangle-in-histogram
0094-binary-tree-inorder-traversal
0114-flatten-binary-tree-to-linked-list
0150-evaluate-reverse-polish-notation
0173-binary-search-tree-iterator
0224-basic-calculator
0931-maximum-frequency-stack
2236-maximum-twin-sum-of-a-linked-list
2470-removing-stars-from-a-string

Ordered Set

0931-maximum-frequency-stack

Queue

0649-dota2-senate
0860-design-circular-queue
0969-number-of-recent-calls

Math

0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0012-integer-to-roman
0048-rotate-image
0067-add-binary
0069-sqrtx
0150-evaluate-reverse-polish-notation
0224-basic-calculator
0371-sum-of-two-integers
0380-insert-delete-getrandom-o1
0523-continuous-subarray-sum
1014-k-closest-points-to-origin
1993-sum-of-all-subset-xor-totals

Recursion

0002-add-two-numbers
0224-basic-calculator

Monotonic Stack

0084-largest-rectangle-in-histogram

Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0110-balanced-binary-tree
0112-path-sum
0113-path-sum-ii
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0129-sum-root-to-leaf-numbers
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0337-house-robber-iii
0437-path-sum-iii
0572-subtree-of-another-tree
0637-average-of-levels-in-binary-tree
0772-construct-quad-tree
0783-search-in-a-binary-search-tree
0789-kth-largest-element-in-a-stream
1116-maximum-level-sum-of-a-binary-tree
1450-delete-leaves-with-a-given-value
1544-count-good-nodes-in-binary-tree

Depth-First Search

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0110-balanced-binary-tree
0112-path-sum
0113-path-sum-ii
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0129-sum-root-to-leaf-numbers
0199-binary-tree-right-side-view
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0337-house-robber-iii
0437-path-sum-iii
0572-subtree-of-another-tree
0637-average-of-levels-in-binary-tree
1116-maximum-level-sum-of-a-binary-tree
1450-delete-leaves-with-a-given-value
1544-count-good-nodes-in-binary-tree

Breadth-First Search

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0112-path-sum
0117-populating-next-right-pointers-in-each-node-ii
0199-binary-tree-right-side-view
0226-invert-binary-tree
0637-average-of-levels-in-binary-tree
1116-maximum-level-sum-of-a-binary-tree
1544-count-good-nodes-in-binary-tree

Binary Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0110-balanced-binary-tree
0112-path-sum
0113-path-sum-ii
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0129-sum-root-to-leaf-numbers
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0337-house-robber-iii
0437-path-sum-iii
0572-subtree-of-another-tree
0637-average-of-levels-in-binary-tree
0783-search-in-a-binary-search-tree
0789-kth-largest-element-in-a-stream
1116-maximum-level-sum-of-a-binary-tree
1450-delete-leaves-with-a-given-value
1544-count-good-nodes-in-binary-tree

Doubly-Linked List

0146-lru-cache

Binary Search Tree

0098-validate-binary-search-tree
0108-convert-sorted-array-to-binary-search-tree
0173-binary-search-tree-iterator
0230-kth-smallest-element-in-a-bst
0783-search-in-a-binary-search-tree
0789-kth-largest-element-in-a-stream

String Matching

0003-longest-substring-without-repeating-characters
0006-zigzag-conversion
0012-integer-to-roman
0022-generate-parentheses
0067-add-binary
0131-palindrome-partitioning
0151-reverse-words-in-a-string
0208-implement-trie-prefix-tree
0224-basic-calculator
0443-string-compression
0572-subtree-of-another-tree
0649-dota2-senate
0768-partition-labels
0778-reorganize-string
0800-letter-case-permutation
1304-longest-happy-string
1567-maximum-number-of-vowels-in-a-substring-of-given-length
1777-determine-if-two-strings-are-close
2470-removing-stars-from-a-string

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
0295-find-median-from-data-stream
0355-design-twitter
0373-find-k-pairs-with-smallest-sums
0502-ipo
0621-task-scheduler
0778-reorganize-string
0789-kth-largest-element-in-a-stream
1014-k-closest-points-to-origin
1127-last-stone-weight
1184-car-pooling
1304-longest-happy-string
1962-single-threaded-cpu

Data Stream

0295-find-median-from-data-stream
0789-kth-largest-element-in-a-stream
0969-number-of-recent-calls

Sliding Window

0003-longest-substring-without-repeating-characters
1046-max-consecutive-ones-iii
1567-maximum-number-of-vowels-in-a-substring-of-given-length
1586-longest-subarray-of-1s-after-deleting-one-element

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
0108-convert-sorted-array-to-binary-search-tree
0148-sort-list
0215-kth-largest-element-in-an-array
0772-construct-quad-tree
1014-k-closest-points-to-origin

Quickselect

0215-kth-largest-element-in-an-array
1014-k-closest-points-to-origin

Greedy

0045-jump-game-ii
0055-jump-game
0134-gas-station
0135-candy
0334-increasing-triplet-subsequence
0435-non-overlapping-intervals
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
0621-task-scheduler
0649-dota2-senate
0768-partition-labels
0778-reorganize-string
1304-longest-happy-string

Two Pointers

0015-3sum
0018-4sum
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0148-sort-list
0151-reverse-words-in-a-string
0295-find-median-from-data-stream
0443-string-compression
0768-partition-labels
1798-max-number-of-k-sum-pairs
2236-maximum-twin-sum-of-a-linked-list
2392-successful-pairs-of-spells-and-potions

Bit Manipulation

0067-add-binary
0078-subsets
0201-bitwise-and-of-numbers-range
0222-count-complete-tree-nodes
0371-sum-of-two-integers
0800-letter-case-permutation
1993-sum-of-all-subset-xor-totals
3394-minimum-array-end

Simulation

0067-add-binary
0898-transpose-matrix
1184-car-pooling
2428-equal-row-and-column-pairs
2470-removing-stars-from-a-string

Dynamic Programming

0022-generate-parentheses
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0131-palindrome-partitioning
0337-house-robber-iii
0435-non-overlapping-intervals
1586-longest-subarray-of-1s-after-deleting-one-element

Geometry

1014-k-closest-points-to-origin

K-D Tree

1014-k-closest-points-to-origin

Prefix Sum

0523-continuous-subarray-sum
1046-max-consecutive-ones-iii
1184-car-pooling

Longest Increasing Subsequence

0334-increasing-triplet-subsequence

Quicksort

0056-merge-intervals

Trie

0208-implement-trie-prefix-tree

Randomized

0380-insert-delete-getrandom-o1

Counting Sort

0274-h-index

Iterator

0173-binary-search-tree-iterator

Pigeonhole Principle

0523-continuous-subarray-sum

Binary Lifting

0236-lowest-common-ancestor-of-a-binary-tree

Lowest Common Ancestor

0236-lowest-common-ancestor-of-a-binary-tree

DP on Trees

0337-house-robber-iii

Backtracking

0022-generate-parentheses
0039-combination-sum
0077-combinations
0078-subsets
0113-path-sum-ii
0131-palindrome-partitioning
0216-combination-sum-iii
0800-letter-case-permutation
1993-sum-of-all-subset-xor-totals

Merge Sort

0148-sort-list

Combinatorics

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

Enumeration

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

Bracket Sequences

0022-generate-parentheses

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