LeetCode Topics

String

0014-longest-common-prefix
0392-is-subsequence
0415-add-strings
1537-maximum-score-after-splitting-a-string
2691-count-vowel-strings-in-ranges

Prefix Sum

0410-split-array-largest-sum
0560-subarray-sum-equals-k
0724-find-pivot-index
1537-maximum-score-after-splitting-a-string
2102-find-the-middle-index-in-array
2691-count-vowel-strings-in-ranges

Array

0001-two-sum
0014-longest-common-prefix
0015-3sum
0018-4sum
0026-remove-duplicates-from-sorted-array
0031-next-permutation
0033-search-in-rotated-sorted-array
0039-combination-sum
0048-rotate-image
0053-maximum-subarray
0054-spiral-matrix
0056-merge-intervals
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0078-subsets
0081-search-in-rotated-sorted-array-ii
0088-merge-sorted-array
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0128-longest-consecutive-sequence
0136-single-number
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0167-two-sum-ii-input-array-is-sorted
0189-rotate-array
0229-majority-element-ii
0240-search-a-2d-matrix-ii
0268-missing-number
0283-move-zeroes
0410-split-array-largest-sum
0485-max-consecutive-ones
0493-reverse-pairs
0506-relative-ranks
0540-single-element-in-a-sorted-array
0560-subarray-sum-equals-k
0724-find-pivot-index
0748-largest-number-at-least-twice-of-others
0792-binary-search
0817-design-hashmap
0882-peak-index-in-a-mountain-array
0907-koko-eating-bananas
0941-sort-array-by-parity
0958-sort-array-by-parity-ii
1056-capacity-to-ship-packages-within-d-days
1210-mean-of-array-after-removing-some-elements
1349-check-if-it-is-a-straight-line
1408-find-the-smallest-divisor-given-a-threshold
1463-the-k-weakest-rows-in-a-matrix
1468-check-if-n-and-its-double-exist
1476-count-negative-numbers-in-a-sorted-matrix
1486-find-the-distance-value-between-two-arrays
1582-design-browser-history
1584-average-salary-excluding-the-minimum-and-maximum-salary
1605-minimum-number-of-days-to-make-m-bouquets
1646-kth-missing-positive-number
1677-matrix-diagonal-sum
1730-special-array-with-x-elements-greater-than-or-equal-x
1878-check-if-array-is-sorted-and-rotated
2047-find-a-peak-element-ii
2102-find-the-middle-index-in-array
2271-rearrange-array-elements-by-sign
2274-keep-multiplying-found-values-by-two
2283-sort-even-and-odd-indices-independently
2398-check-if-matrix-is-x-matrix
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2524-largest-positive-integer-that-exists-with-its-negative
2561-number-of-distinct-averages
2634-minimum-common-value
2691-count-vowel-strings-in-ranges
2737-row-with-maximum-ones
2892-check-if-array-is-good
3227-find-missing-and-repeated-values
3321-type-of-triangle
3334-apple-redistribution-into-boxes
3429-special-array-i
3471-minimum-average-of-smallest-and-largest-elements
3581-the-two-sneaky-numbers-of-digitville
3747-maximum-difference-between-adjacent-elements-in-a-circular-array
3778-transform-array-by-parity
3790-fruits-into-baskets-ii

Math

0002-add-two-numbers
0048-rotate-image
0189-rotate-array
0268-missing-number
0415-add-strings
0441-arranging-coins
0593-valid-square
1349-check-if-it-is-a-straight-line
1411-convert-binary-number-in-a-linked-list-to-integer
2824-check-if-the-number-is-fascinating
3227-find-missing-and-repeated-values
3321-type-of-triangle
3568-find-the-key-of-the-numbers
3581-the-two-sneaky-numbers-of-digitville
3817-maximum-containers-on-a-ship

Simulation

0054-spiral-matrix
0415-add-strings
2271-rearrange-array-elements-by-sign
2274-keep-multiplying-found-values-by-two
3790-fruits-into-baskets-ii

Hash Table

0001-two-sum
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
0229-majority-element-ii
0268-missing-number
0560-subarray-sum-equals-k
0817-design-hashmap
1468-check-if-n-and-its-double-exist
2274-keep-multiplying-found-values-by-two
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2524-largest-positive-integer-that-exists-with-its-negative
2561-number-of-distinct-averages
2634-minimum-common-value
2824-check-if-the-number-is-fascinating
2892-check-if-array-is-good
3227-find-missing-and-repeated-values
3581-the-two-sneaky-numbers-of-digitville

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0025-reverse-nodes-in-k-group
0061-rotate-list
0083-remove-duplicates-from-sorted-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
0817-design-hashmap
0908-middle-of-the-linked-list
1411-convert-binary-number-in-a-linked-list-to-integer
1582-design-browser-history
2216-delete-the-middle-node-of-a-linked-list

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0025-reverse-nodes-in-k-group
0203-remove-linked-list-elements
0206-reverse-linked-list
0234-palindrome-linked-list

Two Pointers

0015-3sum
0018-4sum
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0031-next-permutation
0061-rotate-list
0088-merge-sorted-array
0141-linked-list-cycle
0142-linked-list-cycle-ii
0148-sort-list
0160-intersection-of-two-linked-lists
0167-two-sum-ii-input-array-is-sorted
0189-rotate-array
0234-palindrome-linked-list
0283-move-zeroes
0295-find-median-from-data-stream
0392-is-subsequence
0908-middle-of-the-linked-list
0941-sort-array-by-parity
0958-sort-array-by-parity-ii
1468-check-if-n-and-its-double-exist
1486-find-the-distance-value-between-two-arrays
2216-delete-the-middle-node-of-a-linked-list
2271-rearrange-array-elements-by-sign
2524-largest-positive-integer-that-exists-with-its-negative
2561-number-of-distinct-averages
2634-minimum-common-value
3471-minimum-average-of-smallest-and-largest-elements

Stack

0234-palindrome-linked-list
1582-design-browser-history

Sorting

0015-3sum
0018-4sum
0056-merge-intervals
0088-merge-sorted-array
0148-sort-list
0229-majority-element-ii
0268-missing-number
0295-find-median-from-data-stream
0506-relative-ranks
0748-largest-number-at-least-twice-of-others
0941-sort-array-by-parity
0958-sort-array-by-parity-ii
1210-mean-of-array-after-removing-some-elements
1463-the-k-weakest-rows-in-a-matrix
1468-check-if-n-and-its-double-exist
1486-find-the-distance-value-between-two-arrays
1584-average-salary-excluding-the-minimum-and-maximum-salary
1730-special-array-with-x-elements-greater-than-or-equal-x
2274-keep-multiplying-found-values-by-two
2283-sort-even-and-odd-indices-independently
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2524-largest-positive-integer-that-exists-with-its-negative
2561-number-of-distinct-averages
2892-check-if-array-is-good
3321-type-of-triangle
3334-apple-redistribution-into-boxes
3471-minimum-average-of-smallest-and-largest-elements
3778-transform-array-by-parity

Heap (Priority Queue)

0295-find-median-from-data-stream
0506-relative-ranks
1463-the-k-weakest-rows-in-a-matrix
2473-max-sum-of-a-pair-with-equal-sum-of-digits

Divide and Conquer

0053-maximum-subarray
0148-sort-list
0240-search-a-2d-matrix-ii
0493-reverse-pairs

Merge Sort

0148-sort-list
0493-reverse-pairs

Design

0295-find-median-from-data-stream
0817-design-hashmap
1582-design-browser-history

Doubly-Linked List

1582-design-browser-history

Data Stream

0295-find-median-from-data-stream
1582-design-browser-history

Binary Search

0033-search-in-rotated-sorted-array
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
0374-guess-number-higher-or-lower
0410-split-array-largest-sum
0441-arranging-coins
0493-reverse-pairs
0540-single-element-in-a-sorted-array
0792-binary-search
0882-peak-index-in-a-mountain-array
0907-koko-eating-bananas
1056-capacity-to-ship-packages-within-d-days
1408-find-the-smallest-divisor-given-a-threshold
1463-the-k-weakest-rows-in-a-matrix
1468-check-if-n-and-its-double-exist
1476-count-negative-numbers-in-a-sorted-matrix
1486-find-the-distance-value-between-two-arrays
1605-minimum-number-of-days-to-make-m-bouquets
1646-kth-missing-positive-number
1730-special-array-with-x-elements-greater-than-or-equal-x
2047-find-a-peak-element-ii
2634-minimum-common-value
3790-fruits-into-baskets-ii

Bit Manipulation

0078-subsets
0136-single-number
0268-missing-number
0338-counting-bits
0461-hamming-distance

Database

0181-employees-earning-more-than-their-managers
0196-delete-duplicate-emails
0197-rising-temperature
0607-sales-person
0610-triangle-judgement
0619-biggest-single-number
0627-swap-salary
1135-customers-who-bought-all-products
1136-actors-and-directors-who-cooperated-at-least-three-times
1153-product-sales-analysis-i
1161-project-employees-i
1179-game-play-analysis-i
1541-top-travellers
1724-customer-who-visited-but-did-not-make-any-transactions
1773-percentage-of-users-attended-a-contest
1837-daily-leads-and-partners
1892-find-total-time-spent-by-each-employee
2495-number-of-unique-subjects-taught-by-each-teacher

Hash Function

0817-design-hashmap

Dynamic Programming

0053-maximum-subarray
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0152-maximum-product-subarray
0338-counting-bits
0392-is-subsequence
0410-split-array-largest-sum

Union Find

0128-longest-consecutive-sequence

Matrix

0048-rotate-image
0054-spiral-matrix
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0240-search-a-2d-matrix-ii
1463-the-k-weakest-rows-in-a-matrix
1476-count-negative-numbers-in-a-sorted-matrix
1677-matrix-diagonal-sum
2047-find-a-peak-element-ii
2398-check-if-matrix-is-x-matrix
2737-row-with-maximum-ones
3227-find-missing-and-repeated-values

Counting

0229-majority-element-ii
3778-transform-array-by-parity

Segment Tree

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

Binary Indexed Tree

0493-reverse-pairs

Ordered Set

0493-reverse-pairs

Geometry

0593-valid-square
1349-check-if-it-is-a-straight-line

Greedy

0410-split-array-largest-sum
3334-apple-redistribution-into-boxes

Trie

0014-longest-common-prefix

Interactive

0374-guess-number-higher-or-lower

Backtracking

0039-combination-sum
0078-subsets