LeetCode

LeetCode Topics

Array

Problem Name	Difficulty
0018-4sum	Medium
0031-next-permutation	Medium
0048-rotate-image	Medium
0073-set-matrix-zeroes	Medium
0074-search-a-2d-matrix	Medium
0088-merge-sorted-array	Easy
0118-pascals-triangle	Easy
0121-best-time-to-buy-and-sell-stock	Easy
0128-longest-consecutive-sequence	Medium
0169-majority-element	Easy
0229-majority-element-ii	Medium
0287-find-the-duplicate-number	Medium

Hash Table

Problem Name	Difficulty
0073-set-matrix-zeroes	Medium
0128-longest-consecutive-sequence	Medium
0169-majority-element	Easy
0229-majority-element-ii	Medium

Matrix

Problem Name	Difficulty
0048-rotate-image	Medium
0073-set-matrix-zeroes	Medium
0074-search-a-2d-matrix	Medium

Dynamic Programming

Problem Name	Difficulty
0062-unique-paths	Medium
0118-pascals-triangle	Easy
0121-best-time-to-buy-and-sell-stock	Easy

Two Pointers

Problem Name	Difficulty
0018-4sum	Medium
0031-next-permutation	Medium
0088-merge-sorted-array	Easy
0287-find-the-duplicate-number	Medium

Math

Problem Name	Difficulty
0048-rotate-image	Medium
0050-powx-n	Medium
0062-unique-paths	Medium

Sorting

Problem Name	Difficulty
0018-4sum	Medium
0088-merge-sorted-array	Easy
0169-majority-element	Easy
0229-majority-element-ii	Medium

Binary Search

Problem Name	Difficulty
0074-search-a-2d-matrix	Medium
0287-find-the-duplicate-number	Medium

Bit Manipulation

Problem Name	Difficulty
0287-find-the-duplicate-number	Medium

Recursion

Problem Name	Difficulty
0050-powx-n	Medium

Divide and Conquer

Problem Name	Difficulty
0169-majority-element	Easy

Counting

Problem Name	Difficulty
0169-majority-element	Easy
0229-majority-element-ii	Medium

Combinatorics

Problem Name	Difficulty
0062-unique-paths	Medium

Union-Find

Problem Name	Difficulty
0128-longest-consecutive-sequence	Medium

Name		Name	Last commit message	Last commit date
Latest commit History 1,786 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
0008-string-to-integer-atoi		0008-string-to-integer-atoi
0013-roman-to-integer		0013-roman-to-integer
0014-longest-common-prefix		0014-longest-common-prefix
0015-3sum		0015-3sum
0018-4sum		0018-4sum
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
0025-reverse-nodes-in-k-group		0025-reverse-nodes-in-k-group
0026-remove-duplicates-from-sorted-array		0026-remove-duplicates-from-sorted-array
0028-find-the-index-of-the-first-occurrence-in-a-string		0028-find-the-index-of-the-first-occurrence-in-a-string
0031-next-permutation		0031-next-permutation
0033-search-in-rotated-sorted-array		0033-search-in-rotated-sorted-array
0037-sudoku-solver		0037-sudoku-solver
0038-count-and-say		0038-count-and-say
0039-combination-sum		0039-combination-sum
0040-combination-sum-ii		0040-combination-sum-ii
0041-first-missing-positive		0041-first-missing-positive
0042-trapping-rain-water		0042-trapping-rain-water
0046-permutations		0046-permutations
0048-rotate-image		0048-rotate-image
0050-powx-n		0050-powx-n
0051-n-queens		0051-n-queens
0053-maximum-subarray		0053-maximum-subarray
0056-merge-intervals		0056-merge-intervals
0060-permutation-sequence		0060-permutation-sequence
0061-rotate-list		0061-rotate-list
0062-unique-paths		0062-unique-paths
0070-climbing-stairs		0070-climbing-stairs
0073-set-matrix-zeroes		0073-set-matrix-zeroes
0074-search-a-2d-matrix		0074-search-a-2d-matrix
0075-sort-colors		0075-sort-colors
0084-largest-rectangle-in-histogram		0084-largest-rectangle-in-histogram
0088-merge-sorted-array		0088-merge-sorted-array
0090-subsets-ii		0090-subsets-ii
0094-binary-tree-inorder-traversal		0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree		0098-validate-binary-search-tree
0100-same-tree		0100-same-tree
0101-symmetric-tree		0101-symmetric-tree
0102-binary-tree-level-order-traversal		0102-binary-tree-level-order-traversal
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
0108-convert-sorted-array-to-binary-search-tree		0108-convert-sorted-array-to-binary-search-tree
0110-balanced-binary-tree		0110-balanced-binary-tree
0114-flatten-binary-tree-to-linked-list		0114-flatten-binary-tree-to-linked-list
0116-populating-next-right-pointers-in-each-node		0116-populating-next-right-pointers-in-each-node
0118-pascals-triangle		0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock		0121-best-time-to-buy-and-sell-stock
0124-binary-tree-maximum-path-sum		0124-binary-tree-maximum-path-sum
0128-longest-consecutive-sequence		0128-longest-consecutive-sequence
0131-palindrome-partitioning		0131-palindrome-partitioning
0133-clone-graph		0133-clone-graph
0138-copy-list-with-random-pointer		0138-copy-list-with-random-pointer
0141-linked-list-cycle		0141-linked-list-cycle
0142-linked-list-cycle-ii		0142-linked-list-cycle-ii
0144-binary-tree-preorder-traversal		0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal		0145-binary-tree-postorder-traversal
0146-lru-cache		0146-lru-cache
0151-reverse-words-in-a-string		0151-reverse-words-in-a-string
0152-maximum-product-subarray		0152-maximum-product-subarray
0155-min-stack		0155-min-stack
0160-intersection-of-two-linked-lists		0160-intersection-of-two-linked-lists
0165-compare-version-numbers		0165-compare-version-numbers
0169-majority-element		0169-majority-element
0173-binary-search-tree-iterator		0173-binary-search-tree-iterator
0199-binary-tree-right-side-view		0199-binary-tree-right-side-view
0200-number-of-islands		0200-number-of-islands
0206-reverse-linked-list		0206-reverse-linked-list
0207-course-schedule		0207-course-schedule
0215-kth-largest-element-in-an-array		0215-kth-largest-element-in-an-array
0225-implement-stack-using-queues		0225-implement-stack-using-queues
0229-majority-element-ii		0229-majority-element-ii
0230-kth-smallest-element-in-a-bst		0230-kth-smallest-element-in-a-bst
0232-implement-queue-using-stacks		0232-implement-queue-using-stacks
0234-palindrome-linked-list		0234-palindrome-linked-list
0235-lowest-common-ancestor-of-a-binary-search-tree		0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree		0236-lowest-common-ancestor-of-a-binary-tree
0237-delete-node-in-a-linked-list		0237-delete-node-in-a-linked-list
0239-sliding-window-maximum		0239-sliding-window-maximum
0242-valid-anagram		0242-valid-anagram
0257-binary-tree-paths		0257-binary-tree-paths
0287-find-the-duplicate-number		0287-find-the-duplicate-number
0295-find-median-from-data-stream		0295-find-median-from-data-stream
0297-serialize-and-deserialize-binary-tree		0297-serialize-and-deserialize-binary-tree
0300-longest-increasing-subsequence		0300-longest-increasing-subsequence
0347-top-k-frequent-elements		0347-top-k-frequent-elements
0378-kth-smallest-element-in-a-sorted-matrix		0378-kth-smallest-element-in-a-sorted-matrix
0399-evaluate-division		0399-evaluate-division
0455-assign-cookies		0455-assign-cookies
0485-max-consecutive-ones		0485-max-consecutive-ones
0493-reverse-pairs		0493-reverse-pairs
0496-next-greater-element-i		0496-next-greater-element-i
0540-single-element-in-a-sorted-array		0540-single-element-in-a-sorted-array
0543-diameter-of-binary-tree		0543-diameter-of-binary-tree

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