Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly
Sign up
Appearance settings

angelagarwal2/leetcode_solutions

Folders and files

NameName
Last commit message
Last commit date

Latest commit

Repository files navigation

LeetCode Topics

Array
0001-two-sum
0004-median-of-two-sorted-arrays
0015-3sum
0018-4sum
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
0041-first-missing-positive
0042-trapping-rain-water
0045-jump-game-ii
0048-rotate-image
0051-n-queens
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0057-insert-interval
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
0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0088-merge-sorted-array
0090-subsets-ii
0118-pascals-triangle
0119-pascals-triangle-ii
0121-best-time-to-buy-and-sell-stock
0128-longest-consecutive-sequence
0135-candy
0136-single-number
0137-single-number-ii
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0189-rotate-array
0204-count-primes
0216-combination-sum-iii
0217-contains-duplicate
0219-contains-duplicate-ii
0229-majority-element-ii
0238-product-of-array-except-self
0240-search-a-2d-matrix-ii
0260-single-number-iii
0268-missing-number
0283-move-zeroes
0287-find-the-duplicate-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0410-split-array-largest-sum
0414-third-maximum-number
0435-non-overlapping-intervals
0448-find-all-numbers-disappeared-in-an-array
0455-assign-cookies
0472-concatenated-words
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
0594-longest-harmonious-subsequence
0628-maximum-product-of-three-numbers
0645-set-mismatch
0735-asteroid-collision
0739-daily-temperatures
0745-find-smallest-letter-greater-than-target
0748-largest-number-at-least-twice-of-others
0792-binary-search
0808-number-of-matching-subsequences
0890-lemonade-change
0907-koko-eating-bananas
0940-fruit-into-baskets
0943-sum-of-subarray-minimums
0966-binary-subarrays-with-sum
0981-delete-columns-to-make-sorted
1034-subarrays-with-k-different-integers
1046-max-consecutive-ones-iii
1056-capacity-to-ship-packages-within-d-days
1306-minimum-absolute-difference
1310-watering-plants
1370-count-number-of-nice-subarrays
1408-find-the-smallest-divisor-given-a-threshold
1421-find-numbers-with-even-number-of-digits
1426-find-n-unique-integers-sum-up-to-zero
1510-find-lucky-integer-in-an-array
1538-maximum-points-you-can-obtain-from-cards
1586-longest-subarray-of-1s-after-deleting-one-element
1605-minimum-number-of-days-to-make-m-bouquets
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1646-kth-missing-positive-number
1675-magnetic-force-between-two-balls
1781-check-if-two-string-arrays-are-equivalent
1848-sum-of-unique-elements
1878-check-if-array-is-sorted-and-rotated
1966-frequency-of-the-most-frequent-element
1995-finding-pairs-with-a-certain-sum
2047-find-a-peak-element-ii
2227-sum-of-subarray-ranges
2248-minimum-cost-of-buying-candies-with-discount
2271-rearrange-array-elements-by-sign
2316-count-hills-and-valleys-in-an-array
2432-number-of-zero-filled-subarrays
2737-row-with-maximum-ones
3227-find-missing-and-repeated-values
3321-type-of-triangle
3490-find-the-maximum-length-of-valid-subsequence-i
3788-maximum-unique-subarray-sum-after-deletion
3790-fruits-into-baskets-ii

Hash Table
0001-two-sum
0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0041-first-missing-positive
0073-set-matrix-zeroes
0128-longest-consecutive-sequence
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0142-linked-list-cycle-ii
0160-intersection-of-two-linked-lists
0169-majority-element
0202-happy-number
0205-isomorphic-strings
0217-contains-duplicate
0219-contains-duplicate-ii
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0290-word-pattern
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0383-ransom-note
0387-first-unique-character-in-a-string
0389-find-the-difference
0409-longest-palindrome
0424-longest-repeating-character-replacement
0448-find-all-numbers-disappeared-in-an-array
0451-sort-characters-by-frequency
0496-next-greater-element-i
0560-subarray-sum-equals-k
0594-longest-harmonious-subsequence
0645-set-mismatch
0808-number-of-matching-subsequences
0889-buddy-strings
0940-fruit-into-baskets
0966-binary-subarrays-with-sum
1034-subarrays-with-k-different-integers
1370-count-number-of-nice-subarrays
1460-number-of-substrings-containing-all-three-characters
1510-find-lucky-integer-in-an-array
1777-determine-if-two-strings-are-close
1848-sum-of-unique-elements
1890-sum-of-beauty-of-all-substrings
1960-check-if-the-sentence-is-pangram
1995-finding-pairs-with-a-certain-sum
2053-check-if-all-characters-have-equal-number-of-occurrences
2059-unique-length-3-palindromic-subsequences
3227-find-missing-and-repeated-values
3788-maximum-unique-subarray-sum-after-deletion

Math
0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0012-integer-to-roman
0013-roman-to-integer
0029-divide-two-integers
0048-rotate-image
0050-powx-n
0060-permutation-sequence
0066-plus-one
0069-sqrtx
0189-rotate-array
0202-happy-number
0204-count-primes
0231-power-of-two
0268-missing-number
0326-power-of-three
0342-power-of-four
0628-maximum-product-of-three-numbers
0935-orderly-queue
1013-fibonacci-number
1146-greatest-common-divisor-of-strings
1370-count-number-of-nice-subarrays
1411-convert-binary-number-in-a-linked-list-to-integer
1421-find-numbers-with-even-number-of-digits
1426-find-n-unique-integers-sum-up-to-zero
1440-convert-integer-to-the-sum-of-two-no-zero-integers
1448-maximum-69-number
1610-xor-operation-in-an-array
1885-count-number-of-homogenous-substrings
2032-largest-odd-number-in-string
2050-count-good-numbers
2432-number-of-zero-filled-subarrays
2630-alternating-digit-sum
3172-divisible-and-non-divisible-sums-difference
3227-find-missing-and-repeated-values
3321-type-of-triangle
3830-find-closest-person

Two Pointers
0005-longest-palindromic-substring
0015-3sum
0018-4sum
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string
0031-next-permutation
0042-trapping-rain-water
0061-rotate-list
0075-sort-colors
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0088-merge-sorted-array
0125-valid-palindrome
0141-linked-list-cycle
0142-linked-list-cycle-ii
0148-sort-list
0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists
0167-two-sum-ii-input-array-is-sorted
0189-rotate-array
0202-happy-number
0234-palindrome-linked-list
0283-move-zeroes
0287-find-the-duplicate-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0392-is-subsequence
0443-string-compression
0455-assign-cookies
0557-reverse-words-in-a-string-iii
0874-backspace-string-compare
0908-middle-of-the-linked-list
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
2216-delete-the-middle-node-of-a-linked-list
2271-rearrange-array-elements-by-sign

Sorting
0015-3sum
0018-4sum
0056-merge-intervals
0075-sort-colors
0088-merge-sorted-array
0148-sort-list
0169-majority-element
0217-contains-duplicate
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0389-find-the-difference
0414-third-maximum-number
0435-non-overlapping-intervals
0451-sort-characters-by-frequency
0455-assign-cookies
0594-longest-harmonious-subsequence
0628-maximum-product-of-three-numbers
0645-set-mismatch
0748-largest-number-at-least-twice-of-others
0808-number-of-matching-subsequences
0935-orderly-queue
1306-minimum-absolute-difference
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1675-magnetic-force-between-two-balls
1777-determine-if-two-strings-are-close
1966-frequency-of-the-most-frequent-element
2248-minimum-cost-of-buying-candies-with-discount
2887-sort-vowels-in-a-string
3321-type-of-triangle

Linked List
0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0083-remove-duplicates-from-sorted-list
0086-partition-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
0203-remove-linked-list-elements
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
1411-convert-binary-number-in-a-linked-list-to-integer
2216-delete-the-middle-node-of-a-linked-list

String
0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0008-string-to-integer-atoi
0012-integer-to-roman
0013-roman-to-integer
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0022-generate-parentheses
0028-find-the-index-of-the-first-occurrence-in-a-string
0038-count-and-say
0058-length-of-last-word
0079-word-search
0093-restore-ip-addresses
0125-valid-palindrome
0131-palindrome-partitioning
0151-reverse-words-in-a-string
0205-isomorphic-strings
0242-valid-anagram
0290-word-pattern
0316-remove-duplicate-letters
0383-ransom-note
0387-first-unique-character-in-a-string
0389-find-the-difference
0392-is-subsequence
0402-remove-k-digits
0409-longest-palindrome
0424-longest-repeating-character-replacement
0443-string-compression
0451-sort-characters-by-frequency
0459-repeated-substring-pattern
0472-concatenated-words
0520-detect-capital
0557-reverse-words-in-a-string-iii
0678-valid-parenthesis-string
0808-number-of-matching-subsequences
0812-rotate-string
0874-backspace-string-compare
0889-buddy-strings
0916-decoded-string-at-index
0935-orderly-queue
0981-delete-columns-to-make-sorted
1078-remove-outermost-parentheses
1146-greatest-common-divisor-of-strings
1159-smallest-subsequence-of-distinct-characters
1460-number-of-substrings-containing-all-three-characters
1666-make-the-string-great
1737-maximum-nesting-depth-of-the-parentheses
1777-determine-if-two-strings-are-close
1781-check-if-two-string-arrays-are-equivalent
1823-determine-if-string-halves-are-alike
1885-count-number-of-homogenous-substrings
1890-sum-of-beauty-of-all-substrings
1960-check-if-the-sentence-is-pangram
2032-largest-odd-number-in-string
2053-check-if-all-characters-have-equal-number-of-occurrences
2059-unique-length-3-palindromic-subsequences
2346-largest-3-same-digit-number-in-string
2887-sort-vowels-in-a-string
3396-valid-word
3447-clear-digits
3617-find-the-original-typed-string-i
3931-process-string-with-special-operations-i

Stack
0020-valid-parentheses
0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0094-binary-tree-inorder-traversal
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0155-min-stack
0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0234-palindrome-linked-list
0316-remove-duplicate-letters
0402-remove-k-digits
0496-next-greater-element-i
0503-next-greater-element-ii
0678-valid-parenthesis-string
0735-asteroid-collision
0739-daily-temperatures
0874-backspace-string-compare
0916-decoded-string-at-index
0943-sum-of-subarray-minimums
1078-remove-outermost-parentheses
1159-smallest-subsequence-of-distinct-characters
1666-make-the-string-great
1737-maximum-nesting-depth-of-the-parentheses
2227-sum-of-subarray-ranges
3447-clear-digits

Recursion
0002-add-two-numbers
0021-merge-two-sorted-lists
0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group
0050-powx-n
0060-permutation-sequence
0203-remove-linked-list-elements
0206-reverse-linked-list
0231-power-of-two
0234-palindrome-linked-list
0326-power-of-three
0342-power-of-four
1013-fibonacci-number
2050-count-good-numbers

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
0069-sqrtx
0074-search-a-2d-matrix
0081-search-in-rotated-sorted-array-ii
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0167-two-sum-ii-input-array-is-sorted
0240-search-a-2d-matrix-ii
0268-missing-number
0287-find-the-duplicate-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0410-split-array-largest-sum
0493-reverse-pairs
0540-single-element-in-a-sorted-array
0745-find-smallest-letter-greater-than-target
0792-binary-search
0808-number-of-matching-subsequences
0907-koko-eating-bananas
1046-max-consecutive-ones-iii
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
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1646-kth-missing-positive-number
1675-magnetic-force-between-two-balls
1966-frequency-of-the-most-frequent-element
2047-find-a-peak-element-ii
3790-fruits-into-baskets-ii

Matrix
0048-rotate-image
0054-spiral-matrix
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0085-maximal-rectangle
0240-search-a-2d-matrix-ii
2047-find-a-peak-element-ii
2737-row-with-maximum-ones
3227-find-missing-and-repeated-values

Divide and Conquer
0004-median-of-two-sorted-arrays
0053-maximum-subarray
0148-sort-list
0169-majority-element
0191-number-of-1-bits
0240-search-a-2d-matrix-ii
0493-reverse-pairs

Dynamic Programming
0005-longest-palindromic-substring
0022-generate-parentheses
0042-trapping-rain-water
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0085-maximal-rectangle
0118-pascals-triangle
0119-pascals-triangle-ii
0121-best-time-to-buy-and-sell-stock
0131-palindrome-partitioning
0152-maximum-product-subarray
0392-is-subsequence
0410-split-array-largest-sum
0435-non-overlapping-intervals
0472-concatenated-words
0678-valid-parenthesis-string
0808-number-of-matching-subsequences
0943-sum-of-subarray-minimums
1013-fibonacci-number
1586-longest-subarray-of-1s-after-deleting-one-element
3490-find-the-maximum-length-of-valid-subsequence-i

Simulation
0054-spiral-matrix
0735-asteroid-collision
0874-backspace-string-compare
1310-watering-plants
2271-rearrange-array-elements-by-sign
3447-clear-digits
3790-fruits-into-baskets-ii
3931-process-string-with-special-operations-i

Union Find
0128-longest-consecutive-sequence

Bit Manipulation
0029-divide-two-integers
0078-subsets
0090-subsets-ii
0136-single-number
0137-single-number-ii
0191-number-of-1-bits
0231-power-of-two
0260-single-number-iii
0268-missing-number
0287-find-the-duplicate-number
0342-power-of-four
0389-find-the-difference
0645-set-mismatch
1610-xor-operation-in-an-array
2059-unique-length-3-palindromic-subsequences
2323-minimum-bit-flips-to-convert-number

Counting
0169-majority-element
0229-majority-element-ii
0383-ransom-note
0387-first-unique-character-in-a-string
0451-sort-characters-by-frequency
0594-longest-harmonious-subsequence
1034-subarrays-with-k-different-integers
1510-find-lucky-integer-in-an-array
1777-determine-if-two-strings-are-close
1823-determine-if-string-halves-are-alike
1848-sum-of-unique-elements
1890-sum-of-beauty-of-all-substrings
2053-check-if-all-characters-have-equal-number-of-occurrences

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

Queue
0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0387-first-unique-character-in-a-string

Greedy
0045-jump-game-ii
0055-jump-game
0135-candy
0316-remove-duplicate-letters
0402-remove-k-digits
0409-longest-palindrome
0410-split-array-largest-sum
0435-non-overlapping-intervals
0455-assign-cookies
0678-valid-parenthesis-string
0890-lemonade-change
1159-smallest-subsequence-of-distinct-characters
1448-maximum-69-number
1966-frequency-of-the-most-frequent-element
2032-largest-odd-number-in-string
2248-minimum-cost-of-buying-candies-with-discount
3788-maximum-unique-subarray-sum-after-deletion

Memoization
1013-fibonacci-number

Prefix Sum
0238-product-of-array-except-self
0410-split-array-largest-sum
0560-subarray-sum-equals-k
0966-binary-subarrays-with-sum
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1538-maximum-points-you-can-obtain-from-cards
1966-frequency-of-the-most-frequent-element
2059-unique-length-3-palindromic-subsequences

Sliding Window
0003-longest-substring-without-repeating-characters
0219-contains-duplicate-ii
0424-longest-repeating-character-replacement
0594-longest-harmonious-subsequence
0940-fruit-into-baskets
0966-binary-subarrays-with-sum
1034-subarrays-with-k-different-integers
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1460-number-of-substrings-containing-all-three-characters
1538-maximum-points-you-can-obtain-from-cards
1586-longest-subarray-of-1s-after-deleting-one-element
1966-frequency-of-the-most-frequent-element

Binary Indexed Tree
0493-reverse-pairs

Segment Tree
0493-reverse-pairs
3790-fruits-into-baskets-ii

Merge Sort
0148-sort-list
0493-reverse-pairs

Ordered Set
0493-reverse-pairs
3790-fruits-into-baskets-ii

Trie
0014-longest-common-prefix
0472-concatenated-words
0808-number-of-matching-subsequences

String Matching
0028-find-the-index-of-the-first-occurrence-in-a-string
0459-repeated-substring-pattern
0812-rotate-string

Heap (Priority Queue)
0451-sort-characters-by-frequency

Bucket Sort
0451-sort-characters-by-frequency

Backtracking
0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0039-combination-sum
0040-combination-sum-ii
0051-n-queens
0078-subsets
0079-word-search
0090-subsets-ii
0093-restore-ip-addresses
0131-palindrome-partitioning
0216-combination-sum-iii

Depth-First Search
0079-word-search
0094-binary-tree-inorder-traversal
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0472-concatenated-words

Monotonic Stack
0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0316-remove-duplicate-letters
0402-remove-k-digits
0496-next-greater-element-i
0503-next-greater-element-ii
0739-daily-temperatures
0943-sum-of-subarray-minimums
1159-smallest-subsequence-of-distinct-characters
2227-sum-of-subarray-ranges

Enumeration
0204-count-primes

Number Theory
0204-count-primes

Tree
0094-binary-tree-inorder-traversal
0102-binary-tree-level-order-traversal
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal

Binary Tree
0094-binary-tree-inorder-traversal
0102-binary-tree-level-order-traversal
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal

Breadth-First Search
0102-binary-tree-level-order-traversal

AltStyle によって変換されたページ (->オリジナル) /