leetCode-Problems

LeetCode Topics

Array

Problem Name	Difficulty
0001-two-sum	Easy
0015-3sum	Medium
0018-4sum	Medium
0026-remove-duplicates-from-sorted-array	Easy
0036-valid-sudoku	Medium
0049-group-anagrams	Medium
0128-longest-consecutive-sequence	Medium
0219-contains-duplicate-ii	Easy
0238-product-of-array-except-self	Medium
0347-top-k-frequent-elements	Medium

Hash Table

Problem Name	Difficulty
0001-two-sum	Easy
0003-longest-substring-without-repeating-characters	Medium
0036-valid-sudoku	Medium
0049-group-anagrams	Medium
0128-longest-consecutive-sequence	Medium
0219-contains-duplicate-ii	Easy
0242-valid-anagram	Easy
0347-top-k-frequent-elements	Medium
0567-permutation-in-string	Medium

Union-Find

Problem Name	Difficulty
0128-longest-consecutive-sequence	Medium

Prefix Sum

Problem Name	Difficulty
0238-product-of-array-except-self	Medium

Divide and Conquer

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Sorting

Problem Name	Difficulty
0015-3sum	Medium
0018-4sum	Medium
0049-group-anagrams	Medium
0242-valid-anagram	Easy
0347-top-k-frequent-elements	Medium

Heap (Priority Queue)

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Bucket Sort

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Counting

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Quickselect

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

String

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters	Medium
0049-group-anagrams	Medium
0242-valid-anagram	Easy
0567-permutation-in-string	Medium
0680-valid-palindrome-ii	Easy

Matrix

Problem Name	Difficulty
0036-valid-sudoku	Medium

Two Pointers

Problem Name	Difficulty
0015-3sum	Medium
0018-4sum	Medium
0026-remove-duplicates-from-sorted-array	Easy
0567-permutation-in-string	Medium
0680-valid-palindrome-ii	Easy

Sliding Window

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters	Medium
0219-contains-duplicate-ii	Easy
0567-permutation-in-string	Medium

Greedy

Problem Name	Difficulty
0680-valid-palindrome-ii	Easy

Name		Name	Last commit message	Last commit date
Latest commit History 388 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
0009-palindrome-number		0009-palindrome-number
0015-3sum		0015-3sum
0017-letter-combinations-of-a-phone-number		0017-letter-combinations-of-a-phone-number
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
0022-generate-parentheses		0022-generate-parentheses
0023-merge-k-sorted-lists		0023-merge-k-sorted-lists
0024-swap-nodes-in-pairs		0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group		0025-reverse-nodes-in-k-group
0026-remove-duplicates-from-sorted-array		0026-remove-duplicates-from-sorted-array
0033-search-in-rotated-sorted-array		0033-search-in-rotated-sorted-array
0036-valid-sudoku		0036-valid-sudoku
0039-combination-sum		0039-combination-sum
0040-combination-sum-ii		0040-combination-sum-ii
0046-permutations		0046-permutations
0049-group-anagrams		0049-group-anagrams
0050-powx-n		0050-powx-n
0051-n-queens		0051-n-queens
0053-maximum-subarray		0053-maximum-subarray
0062-unique-paths		0062-unique-paths
0063-unique-paths-ii		0063-unique-paths-ii
0070-climbing-stairs		0070-climbing-stairs
0074-search-a-2d-matrix		0074-search-a-2d-matrix
0076-minimum-window-substring		0076-minimum-window-substring
0078-subsets		0078-subsets
0079-word-search		0079-word-search
0081-search-in-rotated-sorted-array-ii		0081-search-in-rotated-sorted-array-ii
0084-largest-rectangle-in-histogram		0084-largest-rectangle-in-histogram
0090-subsets-ii		0090-subsets-ii
0092-reverse-linked-list-ii		0092-reverse-linked-list-ii
0094-binary-tree-inorder-traversal		0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree		0098-validate-binary-search-tree
0101-symmetric-tree		0101-symmetric-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal		0105-construct-binary-tree-from-preorder-and-inorder-traversal
0110-balanced-binary-tree		0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree		0111-minimum-depth-of-binary-tree
0124-binary-tree-maximum-path-sum		0124-binary-tree-maximum-path-sum
0127-word-ladder		0127-word-ladder
0128-longest-consecutive-sequence		0128-longest-consecutive-sequence
0130-surrounded-regions		0130-surrounded-regions
0131-palindrome-partitioning		0131-palindrome-partitioning
0133-clone-graph		0133-clone-graph
0134-gas-station		0134-gas-station
0138-copy-list-with-random-pointer		0138-copy-list-with-random-pointer
0141-linked-list-cycle		0141-linked-list-cycle
0143-reorder-list		0143-reorder-list
0148-sort-list		0148-sort-list
0150-evaluate-reverse-polish-notation		0150-evaluate-reverse-polish-notation
0153-find-minimum-in-rotated-sorted-array		0153-find-minimum-in-rotated-sorted-array
0155-min-stack		0155-min-stack
0198-house-robber		0198-house-robber
0200-number-of-islands		0200-number-of-islands
0206-reverse-linked-list		0206-reverse-linked-list
0207-course-schedule		0207-course-schedule
0208-implement-trie-prefix-tree		0208-implement-trie-prefix-tree
0210-course-schedule-ii		0210-course-schedule-ii
0211-design-add-and-search-words-data-structure		0211-design-add-and-search-words-data-structure
0212-word-search-ii		0212-word-search-ii
0213-house-robber-ii		0213-house-robber-ii
0219-contains-duplicate-ii		0219-contains-duplicate-ii
0225-implement-stack-using-queues		0225-implement-stack-using-queues
0226-invert-binary-tree		0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst		0230-kth-smallest-element-in-a-bst
0232-implement-queue-using-stacks		0232-implement-queue-using-stacks
0235-lowest-common-ancestor-of-a-binary-search-tree		0235-lowest-common-ancestor-of-a-binary-search-tree
0238-product-of-array-except-self		0238-product-of-array-except-self
0239-sliding-window-maximum		0239-sliding-window-maximum
0242-valid-anagram		0242-valid-anagram
0295-find-median-from-data-stream		0295-find-median-from-data-stream
0322-coin-change		0322-coin-change
0347-top-k-frequent-elements		0347-top-k-frequent-elements
0394-decode-string		0394-decode-string
0417-pacific-atlantic-water-flow		0417-pacific-atlantic-water-flow
0424-longest-repeating-character-replacement		0424-longest-repeating-character-replacement
0445-add-two-numbers-ii		0445-add-two-numbers-ii
0502-ipo		0502-ipo
0509-fibonacci-number		0509-fibonacci-number
0518-coin-change-ii		0518-coin-change-ii
0567-permutation-in-string		0567-permutation-in-string
0643-maximum-average-subarray-i		0643-maximum-average-subarray-i
0649-dota2-senate		0649-dota2-senate
0678-valid-parenthesis-string		0678-valid-parenthesis-string
0680-valid-palindrome-ii		0680-valid-palindrome-ii
0682-baseball-game		0682-baseball-game
0684-redundant-connection		0684-redundant-connection
0695-max-area-of-island		0695-max-area-of-island
0703-kth-largest-element-in-a-stream		0703-kth-largest-element-in-a-stream
0704-binary-search		0704-binary-search
0739-daily-temperatures		0739-daily-temperatures
0746-min-cost-climbing-stairs		0746-min-cost-climbing-stairs
0763-partition-labels		0763-partition-labels
0846-hand-of-straights		0846-hand-of-straights
0862-shortest-subarray-with-sum-at-least-k		0862-shortest-subarray-with-sum-at-least-k
0875-koko-eating-bananas		0875-koko-eating-bananas

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leetCode-Problems

LeetCode Topics

Array

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Union-Find

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Divide and Conquer

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Heap (Priority Queue)

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Counting

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Sliding Window

Greedy

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leetCode-Problems

LeetCode Topics

Array

Hash Table

Union-Find

Prefix Sum

Divide and Conquer

Sorting

Heap (Priority Queue)

Bucket Sort

Counting

Quickselect

String

Matrix

Two Pointers

Sliding Window

Greedy

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