DSA-Questions

A collection of LeetCode questions to ace the coding interview! - Created using LeetHub v2

LeetCode Topics

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0049-group-anagrams
0053-maximum-subarray
0056-merge-intervals
0066-plus-one
0073-set-matrix-zeroes
0075-sort-colors
0081-search-in-rotated-sorted-array-ii
0085-maximal-rectangle
0139-word-break
0189-rotate-array
0238-product-of-array-except-self
0349-intersection-of-two-arrays
0368-largest-divisible-subset
0416-partition-equal-subset-sum
0594-longest-harmonious-subsequence
0717-1-bit-and-2-bit-characters
0744-find-smallest-letter-greater-than-target
0787-sliding-puzzle
0797-rabbits-in-forest
0892-shortest-subarray-with-sum-at-least-k
0905-length-of-longest-fibonacci-subsequence
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0940-fruit-into-baskets
0941-sort-array-by-parity
0945-snakes-and-ladders
0961-n-repeated-element-in-size-2n-array
1002-maximum-width-ramp
1147-flip-columns-for-maximum-number-of-equal-rows
1200-minimum-absolute-difference
1227-number-of-equivalent-domino-pairs
1256-rank-transform-of-an-array
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1293-three-consecutive-odds
1335-maximum-candies-allocated-to-k-children
1350-remove-sub-folders-from-the-filesystem
1390-four-divisors
1402-count-square-submatrices-with-all-ones
1421-find-numbers-with-even-number-of-digits
1424-maximum-candies-you-can-get-from-boxes
1458-max-dot-product-of-two-subsequences
1468-check-if-n-and-its-double-exist
1478-maximum-number-of-events-that-can-be-attended
1510-find-lucky-integer-in-an-array
1548-check-if-all-1s-are-at-least-length-k-places-away
1620-check-if-array-pairs-are-divisible-by-k
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1631-number-of-sub-arrays-with-odd-sum
1656-count-good-triplets
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1694-make-sum-divisible-by-p
1755-defuse-the-bomb
1766-minimum-number-of-removals-to-make-mountain-array
1849-maximum-absolute-sum-of-any-subarray
1851-maximum-number-of-events-that-can-be-attended-ii
1877-minimize-maximum-pair-sum-in-array
1878-check-if-array-is-sorted-and-rotated
1886-minimum-limit-of-balls-in-a-bag
1895-largest-magic-square
1917-maximum-average-pass-ratio
1923-sentence-similarity-iii
1940-maximum-xor-for-each-query
1972-rotating-the-box
1975-maximum-matrix-sum
1984-minimum-difference-between-highest-and-lowest-of-k-scores
1993-sum-of-all-subset-xor-totals
1995-finding-pairs-with-a-certain-sum
2048-build-array-from-permutation
2079-delete-duplicate-folders-in-system
2089-maximum-matrix-sum
2107-find-unique-binary-string
2110-number-of-smooth-descent-periods-of-a-stock
2144-maximum-difference-between-increasing-elements
2150-kth-smallest-product-of-two-sorted-arrays
2164-two-best-non-overlapping-events
2170-count-number-of-maximum-bitwise-or-subsets
2179-most-beautiful-item-for-each-query
2180-maximum-number-of-tasks-you-can-assign
2188-minimized-maximum-of-products-distributed-to-any-store
2204-find-subsequence-of-length-k-with-the-largest-sum
2220-find-all-possible-recipes-from-given-supplies
2229-maximum-fruits-harvested-after-at-most-k-steps
2232-adding-spaces-to-a-string
2237-longest-palindrome-by-concatenating-two-letter-words
2249-count-the-hidden-sequences
2262-solving-questions-with-brainpower
2265-partition-array-according-to-given-pivot
2267-minimum-difference-in-sums-after-removal-of-elements
2277-count-equal-and-divisible-pairs-in-an-array
2280-count-good-triplets-in-an-array
2308-divide-array-into-equal-pairs
2316-count-hills-and-valleys-in-an-array
2320-find-all-k-distant-indices-in-an-array
2343-count-unguarded-cells-in-the-grid
2356-largest-combination-with-bitwise-and-greater-than-zero
2375-minimum-obstacle-removal-to-reach-corner
2387-partition-array-such-that-maximum-difference-is-k
2394-count-subarrays-with-score-less-than-k
2400-minimum-score-after-removals-on-a-tree
2478-longest-nice-subarray
2479-meeting-rooms-iii
2488-divide-intervals-into-minimum-number-of-groups
2497-maximum-matching-of-players-with-trainers
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
2527-count-subarrays-with-fixed-bounds
2551-apply-operations-to-an-array
2554-minimum-total-distance-traveled
2564-most-profitable-path-in-a-tree
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2614-maximum-count-of-positive-integer-and-negative-integer
2616-maximal-score-after-applying-k-operations
2626-count-the-number-of-good-subarrays
2640-maximum-number-of-integers-to-choose-from-a-range-i
2665-minimum-time-to-repair-cars
2681-put-marbles-in-bags
2690-house-robber-iv
2691-count-vowel-strings-in-ranges
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2711-minimum-time-to-visit-a-cell-in-a-grid
2716-prime-subtraction-operation
2720-minimize-the-maximum-difference-of-pairs
2794-maximum-number-of-moves-in-a-grid
2856-count-complete-subarrays-in-an-array
2868-continuous-subarrays
2915-count-of-interesting-subarrays
2975-maximum-square-area-by-removing-fences-from-a-field
2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
3001-apply-operations-to-maximize-score
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3013-divide-an-array-into-subarrays-with-minimum-cost-ii
3047-find-the-largest-area-of-square-inside-two-rectangles
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3154-maximum-value-of-an-ordered-triplet-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3194-find-words-containing-character
3213-count-subarrays-where-max-element-appears-at-least-k-times
3227-find-missing-and-repeated-values
3241-divide-array-into-arrays-with-max-difference
3291-find-if-array-can-be-sorted
3307-find-the-maximum-sum-of-node-values
3314-construct-the-minimum-bitwise-array-i
3315-construct-the-minimum-bitwise-array-ii
3321-type-of-triangle
3348-minimum-cost-walk-in-weighted-graph
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3379-transformed-array
3380-shortest-subarray-with-or-at-least-k-ii
3381-maximum-subarray-sum-with-length-divisible-by-k
3429-special-array-i
3453-separate-squares-i
3454-separate-squares-ii
3483-alternating-groups-ii
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3517-shortest-distance-after-road-addition-queries-i
3522-find-the-power-of-k-size-subarrays-i
3555-final-array-state-after-k-multiplication-operations-i
3562-maximum-profit-from-trading-stocks-with-discounts
3621-minimum-operations-to-make-array-values-equal-to-k
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3634-minimum-removals-to-balance-array
3637-trionic-array-i
3640-trionic-array-ii
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii
3651-minimum-cost-path-with-teleportations
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3685-count-subarrays-of-length-three-with-a-condition
3721-longest-balanced-subarray-ii
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3788-maximum-unique-subarray-sum-after-deletion
3789-maximize-subarrays-after-removing-one-conflicting-pair

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0049-group-anagrams
0073-set-matrix-zeroes
0139-word-break
0242-valid-anagram
0349-intersection-of-two-arrays
0387-first-unique-character-in-a-string
0451-sort-characters-by-frequency
0567-permutation-in-string
0594-longest-harmonious-subsequence
0768-partition-labels
0797-rabbits-in-forest
0865-smallest-subtree-with-all-the-deepest-nodes
0905-length-of-longest-fibonacci-subsequence
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0940-fruit-into-baskets
0961-n-repeated-element-in-size-2n-array
1147-flip-columns-for-maximum-number-of-equal-rows
1218-lowest-common-ancestor-of-deepest-leaves
1227-number-of-equivalent-domino-pairs
1256-rank-transform-of-an-array
1387-find-elements-in-a-contaminated-binary-tree
1468-check-if-n-and-its-double-exist
1500-count-largest-group
1510-find-lucky-integer-in-an-array
1620-check-if-array-pairs-are-divisible-by-k
1694-make-sum-divisible-by-p
1960-check-if-the-sentence-is-pangram
1995-finding-pairs-with-a-certain-sum
2079-delete-duplicate-folders-in-system
2107-find-unique-binary-string
2204-find-subsequence-of-length-k-with-the-largest-sum
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2300-construct-string-with-repeat-limit
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2479-meeting-rooms-iii
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2599-take-k-of-each-character-from-left-and-right
2626-count-the-number-of-good-subarrays
2640-maximum-number-of-integers-to-choose-from-a-range-i
2707-merge-two-2d-arrays-by-summing-values
2856-count-complete-subarrays-in-an-array
2915-count-of-interesting-subarrays
2975-maximum-square-area-by-removing-fences-from-a-field
3013-divide-an-array-into-subarrays-with-minimum-cost-ii
3227-find-missing-and-repeated-values
3267-find-longest-special-substring-that-occurs-thrice-i
3360-minimum-deletions-to-make-string-k-special
3381-maximum-subarray-sum-with-length-divisible-by-k
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3548-find-the-count-of-good-integers
3621-minimum-operations-to-make-array-values-equal-to-k
3629-total-characters-in-string-after-transformations-i
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3713-longest-balanced-substring-i
3714-longest-balanced-substring-ii
3721-longest-balanced-subarray-ii
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3788-maximum-unique-subarray-sum-after-deletion

Math

0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0066-plus-one
0067-add-binary
0189-rotate-array
0342-power-of-four
0368-largest-divisible-subset
0670-maximum-swap
0797-rabbits-in-forest
1390-four-divisors
1411-convert-binary-number-in-a-linked-list-to-integer
1421-find-numbers-with-even-number-of-digits
1448-maximum-69-number
1500-count-largest-group
1529-max-difference-you-can-get-from-changing-an-integer
1631-number-of-sub-arrays-with-odd-sum
1889-check-if-number-is-a-sum-of-powers-of-three
1993-sum-of-all-subset-xor-totals
2050-count-good-numbers
2110-number-of-smooth-descent-periods-of-a-stock
2202-sum-of-k-mirror-numbers
2415-count-the-number-of-ideal-arrays
2610-closest-prime-numbers-in-range
2649-count-total-number-of-colored-cells
2704-maximum-difference-by-remapping-a-digit
2716-prime-subtraction-operation
2998-count-symmetric-integers
3001-apply-operations-to-maximize-score
3047-find-the-largest-area-of-square-inside-two-rectangles
3172-divisible-and-non-divisible-sums-difference
3201-distribute-candies-among-children-ii
3227-find-missing-and-repeated-values
3243-count-the-number-of-powerful-integers
3321-type-of-triangle
3548-find-the-count-of-good-integers
3555-final-array-state-after-k-multiplication-operations-i
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii
3629-total-characters-in-string-after-transformations-i
3637-count-number-of-balanced-permutations
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements
3754-maximum-manhattan-distance-after-k-changes

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0008-string-to-integer-atoi
0038-count-and-say
0049-group-anagrams
0067-add-binary
0139-word-break
0242-valid-anagram
0344-reverse-string
0387-first-unique-character-in-a-string
0443-string-compression
0451-sort-characters-by-frequency
0567-permutation-in-string
0696-count-binary-substrings
0768-partition-labels
0812-rotate-string
0868-push-dominoes
0957-minimum-add-to-make-parentheses-valid
1093-recover-a-tree-from-preorder-traversal
1170-shortest-common-supersequence
1302-delete-characters-to-make-fancy-string
1304-longest-happy-string
1350-remove-sub-folders-from-the-filesystem
1537-maximum-score-after-splitting-a-string
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1653-minimum-deletions-to-make-string-balanced
1667-find-kth-bit-in-nth-binary-string
1923-sentence-similarity-iii
1960-check-if-the-sentence-is-pangram
2079-delete-duplicate-folders-in-system
2095-minimum-number-of-swaps-to-make-the-string-balanced
2107-find-unique-binary-string
2140-longest-subsequence-repeated-k-times
2211-count-collisions-on-a-road
2220-find-all-possible-recipes-from-given-supplies
2232-adding-spaces-to-a-string
2237-longest-palindrome-by-concatenating-two-letter-words
2260-divide-a-string-into-groups-of-size-k
2300-construct-string-with-repeat-limit
2346-largest-3-same-digit-number-in-string
2395-longest-binary-subsequence-less-than-or-equal-to-k
2414-move-pieces-to-obtain-a-string
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2580-circular-sentence
2599-take-k-of-each-character-from-left-and-right
2691-count-vowel-strings-in-ranges
2800-minimum-string-length-after-removing-substrings
2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
3018-make-string-a-subsequence-using-cyclic-increments
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3174-minimum-number-of-changes-to-make-binary-string-beautiful
3194-find-words-containing-character
3243-count-the-number-of-powerful-integers
3267-find-longest-special-substring-that-occurs-thrice-i
3360-minimum-deletions-to-make-string-k-special
3451-string-compression-iii
3617-find-the-original-typed-string-i
3618-find-the-original-typed-string-ii
3629-total-characters-in-string-after-transformations-i
3637-count-number-of-balanced-permutations
3683-find-the-lexicographically-largest-string-from-the-box-i
3713-longest-balanced-substring-i
3714-longest-balanced-substring-ii
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3761-maximum-difference-between-even-and-odd-frequency-ii

Sliding Window

0003-longest-substring-without-repeating-characters
0567-permutation-in-string
0594-longest-harmonious-subsequence
0892-shortest-subarray-with-sum-at-least-k
0940-fruit-into-baskets
1755-defuse-the-bomb
1984-minimum-difference-between-highest-and-lowest-of-k-scores
2229-maximum-fruits-harvested-after-at-most-k-steps
2394-count-subarrays-with-score-less-than-k
2478-longest-nice-subarray
2498-smallest-subarrays-with-maximum-bitwise-or
2527-count-subarrays-with-fixed-bounds
2599-take-k-of-each-character-from-left-and-right
2626-count-the-number-of-good-subarrays
2856-count-complete-subarrays-in-an-array
2868-continuous-subarrays
3013-divide-an-array-into-subarrays-with-minimum-cost-ii
3213-count-subarrays-where-max-element-appears-at-least-k-times
3267-find-longest-special-substring-that-occurs-thrice-i
3380-shortest-subarray-with-or-at-least-k-ii
3483-alternating-groups-ii
3522-find-the-power-of-k-size-subarrays-i
3634-minimum-removals-to-balance-array
3743-reschedule-meetings-for-maximum-free-time-i
3761-maximum-difference-between-even-and-odd-frequency-ii

Prefix Sum

0238-product-of-array-except-self
0892-shortest-subarray-with-sum-at-least-k
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1537-maximum-score-after-splitting-a-string
1631-number-of-sub-arrays-with-odd-sum
1694-make-sum-divisible-by-p
1895-largest-magic-square
1940-maximum-xor-for-each-query
2229-maximum-fruits-harvested-after-at-most-k-steps
2249-count-the-hidden-sequences
2394-count-subarrays-with-score-less-than-k
2488-divide-intervals-into-minimum-number-of-groups
2691-count-vowel-strings-in-ranges
2915-count-of-interesting-subarrays
3381-maximum-subarray-sum-with-length-divisible-by-k
3618-find-the-original-typed-string-ii
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii
3714-longest-balanced-substring-ii
3721-longest-balanced-subarray-ii
3761-maximum-difference-between-even-and-odd-frequency-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair

Divide and Conquer

0004-median-of-two-sorted-arrays
0053-maximum-subarray
0190-reverse-bits
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1382-balance-a-binary-search-tree
2280-count-good-triplets-in-an-array
3721-longest-balanced-subarray-ii

Dynamic Programming

0005-longest-palindromic-substring
0053-maximum-subarray
0085-maximal-rectangle
0139-word-break
0368-largest-divisible-subset
0416-partition-equal-subset-sum
0799-champagne-tower
0806-domino-and-tromino-tiling
0868-push-dominoes
0905-length-of-longest-fibonacci-subsequence
1170-shortest-common-supersequence
1402-count-square-submatrices-with-all-ones
1411-number-of-ways-to-paint-n-3-grid
1458-max-dot-product-of-two-subsequences
1631-number-of-sub-arrays-with-odd-sum
1653-minimum-deletions-to-make-string-balanced
1766-minimum-number-of-removals-to-make-mountain-array
1849-maximum-absolute-sum-of-any-subarray
1851-maximum-number-of-events-that-can-be-attended-ii
2028-the-earliest-and-latest-rounds-where-players-compete
2061-painting-a-grid-with-three-different-colors
2110-number-of-smooth-descent-periods-of-a-stock
2164-two-best-non-overlapping-events
2262-solving-questions-with-brainpower
2267-minimum-difference-in-sums-after-removal-of-elements
2395-longest-binary-subsequence-less-than-or-equal-to-k
2415-count-the-number-of-ideal-arrays
2554-minimum-total-distance-traveled
2586-longest-square-streak-in-an-array
2794-maximum-number-of-moves-in-a-grid
2977-minimum-cost-to-convert-string-ii
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3243-count-the-number-of-powerful-integers
3307-find-the-maximum-sum-of-node-values
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3562-maximum-profit-from-trading-stocks-with-discounts
3618-find-the-original-typed-string-ii
3629-total-characters-in-string-after-transformations-i
3637-count-number-of-balanced-permutations
3640-trionic-array-ii
3651-minimum-cost-path-with-teleportations

Sorting

0049-group-anagrams
0056-merge-intervals
0075-sort-colors
0242-valid-anagram
0349-intersection-of-two-arrays
0368-largest-divisible-subset
0451-sort-characters-by-frequency
0594-longest-harmonious-subsequence
0941-sort-array-by-parity
1200-minimum-absolute-difference
1256-rank-transform-of-an-array
1468-check-if-n-and-its-double-exist
1478-maximum-number-of-events-that-can-be-attended
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1851-maximum-number-of-events-that-can-be-attended-ii
1877-minimize-maximum-pair-sum-in-array
1984-minimum-difference-between-highest-and-lowest-of-k-scores
2164-two-best-non-overlapping-events
2179-most-beautiful-item-for-each-query
2180-maximum-number-of-tasks-you-can-assign
2204-find-subsequence-of-length-k-with-the-largest-sum
2387-partition-array-such-that-maximum-difference-is-k
2479-meeting-rooms-iii
2488-divide-intervals-into-minimum-number-of-groups
2497-maximum-matching-of-players-with-trainers
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2640-maximum-number-of-integers-to-choose-from-a-range-i
2646-kth-largest-sum-in-a-binary-tree
2681-put-marbles-in-bags
2699-count-the-number-of-fair-pairs
3001-apply-operations-to-maximize-score
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3241-divide-array-into-arrays-with-max-difference
3291-find-if-array-can-be-sorted
3307-find-the-maximum-sum-of-node-values
3321-type-of-triangle
3360-minimum-deletions-to-make-string-k-special
3634-minimum-removals-to-balance-array
3647-zero-array-transformation-iii

Two Pointers

0005-longest-palindromic-substring
0019-remove-nth-node-from-end-of-list
0075-sort-colors
0189-rotate-array
0344-reverse-string
0349-intersection-of-two-arrays
0443-string-compression
0567-permutation-in-string
0696-count-binary-substrings
0768-partition-labels
0868-push-dominoes
0941-sort-array-by-parity
1468-check-if-n-and-its-double-exist
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1877-minimize-maximum-pair-sum-in-array
1923-sentence-similarity-iii
1972-rotating-the-box
2095-minimum-number-of-swaps-to-make-the-string-balanced
2232-adding-spaces-to-a-string
2265-partition-array-according-to-given-pivot
2320-find-all-k-distant-indices-in-an-array
2414-move-pieces-to-obtain-a-string
2488-divide-intervals-into-minimum-number-of-groups
2497-maximum-matching-of-players-with-trainers
2551-apply-operations-to-an-array
2581-divide-players-into-teams-of-equal-skill
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
3018-make-string-a-subsequence-using-cyclic-increments
3683-find-the-lexicographically-largest-string-from-the-box-i

Binary Search

0004-median-of-two-sorted-arrays
0081-search-in-rotated-sorted-array-ii
0349-intersection-of-two-arrays
0744-find-smallest-letter-greater-than-target
0892-shortest-subarray-with-sum-at-least-k
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1335-maximum-candies-allocated-to-k-children
1468-check-if-n-and-its-double-exist
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1766-minimum-number-of-removals-to-make-mountain-array
1851-maximum-number-of-events-that-can-be-attended-ii
1886-minimum-limit-of-balls-in-a-bag
2150-kth-smallest-product-of-two-sorted-arrays
2164-two-best-non-overlapping-events
2179-most-beautiful-item-for-each-query
2180-maximum-number-of-tasks-you-can-assign
2188-minimized-maximum-of-products-distributed-to-any-store
2229-maximum-fruits-harvested-after-at-most-k-steps
2280-count-good-triplets-in-an-array
2394-count-subarrays-with-score-less-than-k
2498-smallest-subarrays-with-maximum-bitwise-or
2586-longest-square-streak-in-an-array
2614-maximum-count-of-positive-integer-and-negative-integer
2640-maximum-number-of-integers-to-choose-from-a-range-i
2665-minimum-time-to-repair-cars
2690-house-robber-iv
2699-count-the-number-of-fair-pairs
2716-prime-subtraction-operation
2720-minimize-the-maximum-difference-of-pairs
3267-find-longest-special-substring-that-occurs-thrice-i
3453-separate-squares-i
3454-separate-squares-ii
3643-zero-array-transformation-ii

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
1411-convert-binary-number-in-a-linked-list-to-integer
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0342-power-of-four
1667-find-kth-bit-in-nth-binary-string
2050-count-good-numbers
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii

Counting

0387-first-unique-character-in-a-string
0451-sort-characters-by-frequency
0594-longest-harmonious-subsequence
1227-number-of-equivalent-domino-pairs
1510-find-lucky-integer-in-an-array
1620-check-if-array-pairs-are-divisible-by-k
2140-longest-subsequence-repeated-k-times
2237-longest-palindrome-by-concatenating-two-letter-words
2300-construct-string-with-repeat-limit
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2614-maximum-count-of-positive-integer-and-negative-integer
3267-find-longest-special-substring-that-occurs-thrice-i
3360-minimum-deletions-to-make-string-k-special
3629-total-characters-in-string-after-transformations-i
3713-longest-balanced-substring-i
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes

Stack

0085-maximal-rectangle
0957-minimum-add-to-make-parentheses-valid
1002-maximum-width-ramp
1653-minimum-deletions-to-make-string-balanced
1679-shortest-subarray-to-be-removed-to-make-array-sorted
2095-minimum-number-of-swaps-to-make-the-string-balanced
2211-count-collisions-on-a-road
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2800-minimum-string-length-after-removing-substrings
3001-apply-operations-to-maximize-score

Simulation

0067-add-binary
1667-find-kth-bit-in-nth-binary-string
2048-build-array-from-permutation
2211-count-collisions-on-a-road
2232-adding-spaces-to-a-string
2260-divide-a-string-into-groups-of-size-k
2265-partition-array-according-to-given-pivot
2343-count-unguarded-cells-in-the-grid
2479-meeting-rooms-iii
2551-apply-operations-to-an-array
2800-minimum-string-length-after-removing-substrings
3379-transformed-array
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3555-final-array-state-after-k-multiplication-operations-i
3600-find-the-k-th-character-in-string-game-i

Greedy

0670-maximum-swap
0768-partition-labels
0797-rabbits-in-forest
0957-minimum-add-to-make-parentheses-valid
1304-longest-happy-string
1382-balance-a-binary-search-tree
1448-maximum-69-number
1478-maximum-number-of-events-that-can-be-attended
1529-max-difference-you-can-get-from-changing-an-integer
1766-minimum-number-of-removals-to-make-mountain-array
1877-minimize-maximum-pair-sum-in-array
1917-maximum-average-pass-ratio
1975-maximum-matrix-sum
2089-maximum-matrix-sum
2095-minimum-number-of-swaps-to-make-the-string-balanced
2140-longest-subsequence-repeated-k-times
2180-maximum-number-of-tasks-you-can-assign
2237-longest-palindrome-by-concatenating-two-letter-words
2300-construct-string-with-repeat-limit
2387-partition-array-such-that-maximum-difference-is-k
2395-longest-binary-subsequence-less-than-or-equal-to-k
2488-divide-intervals-into-minimum-number-of-groups
2497-maximum-matching-of-players-with-trainers
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2616-maximal-score-after-applying-k-operations
2640-maximum-number-of-integers-to-choose-from-a-range-i
2681-put-marbles-in-bags
2704-maximum-difference-by-remapping-a-digit
2716-prime-subtraction-operation
2720-minimize-the-maximum-difference-of-pairs
3001-apply-operations-to-maximize-score
3143-longest-unequal-adjacent-groups-subsequence-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3241-divide-array-into-arrays-with-max-difference
3307-find-the-maximum-sum-of-node-values
3360-minimum-deletions-to-make-string-k-special
3647-zero-array-transformation-iii
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3788-maximum-unique-subarray-sum-after-deletion

Monotonic Stack

0085-maximal-rectangle
1002-maximum-width-ramp
1679-shortest-subarray-to-be-removed-to-make-array-sorted
3001-apply-operations-to-maximize-score

Heap (Priority Queue)

0451-sort-characters-by-frequency
0892-shortest-subarray-with-sum-at-least-k
1304-longest-happy-string
1478-maximum-number-of-events-that-can-be-attended
1917-maximum-average-pass-ratio
2164-two-best-non-overlapping-events
2204-find-subsequence-of-length-k-with-the-largest-sum
2267-minimum-difference-in-sums-after-removal-of-elements
2300-construct-string-with-repeat-limit
2375-minimum-obstacle-removal-to-reach-corner
2479-meeting-rooms-iii
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
2681-put-marbles-in-bags
2711-minimum-time-to-visit-a-cell-in-a-grid
2868-continuous-subarrays
3013-divide-an-array-into-subarrays-with-minimum-cost-ii
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3555-final-array-state-after-k-multiplication-operations-i
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3647-zero-array-transformation-iii
3650-minimum-cost-path-with-edge-reversals

Trie

0139-word-break
0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
1350-remove-sub-folders-from-the-filesystem
2079-delete-duplicate-folders-in-system
2977-minimum-cost-to-convert-string-ii

Memoization

0139-word-break
2028-the-earliest-and-latest-rounds-where-players-compete
2395-longest-binary-subsequence-less-than-or-equal-to-k

Backtracking

0401-binary-watch
1993-sum-of-all-subset-xor-totals
2107-find-unique-binary-string
2140-longest-subsequence-repeated-k-times
2170-count-number-of-maximum-bitwise-or-subsets

Bit Manipulation

0067-add-binary
0190-reverse-bits
0342-power-of-four
0401-binary-watch
1940-maximum-xor-for-each-query
1993-sum-of-all-subset-xor-totals
2170-count-number-of-maximum-bitwise-or-subsets
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2400-minimum-score-after-removals-on-a-tree
2478-longest-nice-subarray
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
3291-find-if-array-can-be-sorted
3307-find-the-maximum-sum-of-node-values
3314-construct-the-minimum-bitwise-array-i
3315-construct-the-minimum-bitwise-array-ii
3348-minimum-cost-walk-in-weighted-graph
3380-shortest-subarray-with-or-at-least-k-ii
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii

Enumeration

1656-count-good-triplets
1993-sum-of-all-subset-xor-totals
2140-longest-subsequence-repeated-k-times
2170-count-number-of-maximum-bitwise-or-subsets
2202-sum-of-k-mirror-numbers
2975-maximum-square-area-by-removing-fences-from-a-field
2998-count-symmetric-integers
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3201-distribute-candies-among-children-ii
3548-find-the-count-of-good-integers
3683-find-the-lexicographically-largest-string-from-the-box-i
3713-longest-balanced-substring-i
3741-reschedule-meetings-for-maximum-free-time-ii
3761-maximum-difference-between-even-and-odd-frequency-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair

Tree

0110-balanced-binary-tree
0865-smallest-subtree-with-all-the-deepest-nodes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1161-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree
1387-find-elements-in-a-contaminated-binary-tree
2400-minimum-score-after-removals-on-a-tree
2564-most-profitable-path-in-a-tree
2646-kth-largest-sum-in-a-binary-tree
3307-find-the-maximum-sum-of-node-values
3562-maximum-profit-from-trading-stocks-with-discounts
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Breadth-First Search

0787-sliding-puzzle
0865-smallest-subtree-with-all-the-deepest-nodes
0945-snakes-and-ladders
1161-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1424-maximum-candies-you-can-get-from-boxes
2375-minimum-obstacle-removal-to-reach-corner
2564-most-profitable-path-in-a-tree
2646-kth-largest-sum-in-a-binary-tree
2711-minimum-time-to-visit-a-cell-in-a-grid
3517-shortest-distance-after-road-addition-queries-i
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Binary Tree

0110-balanced-binary-tree
0865-smallest-subtree-with-all-the-deepest-nodes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1161-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree
1387-find-elements-in-a-contaminated-binary-tree
2646-kth-largest-sum-in-a-binary-tree

Depth-First Search

0110-balanced-binary-tree
0386-lexicographical-numbers
0865-smallest-subtree-with-all-the-deepest-nodes
1093-recover-a-tree-from-preorder-traversal
1161-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1339-maximum-product-of-splitted-binary-tree
1350-remove-sub-folders-from-the-filesystem
1382-balance-a-binary-search-tree
1387-find-elements-in-a-contaminated-binary-tree
2201-valid-arrangement-of-pairs
2400-minimum-score-after-removals-on-a-tree
2438-find-closest-node-to-given-two-nodes
2564-most-profitable-path-in-a-tree
3562-maximum-profit-from-trading-stocks-with-discounts
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Matrix

0073-set-matrix-zeroes
0085-maximal-rectangle
0787-sliding-puzzle
0945-snakes-and-ladders
1147-flip-columns-for-maximum-number-of-equal-rows
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1402-count-square-submatrices-with-all-ones
1895-largest-magic-square
1972-rotating-the-box
1975-maximum-matrix-sum
2089-maximum-matrix-sum
2343-count-unguarded-cells-in-the-grid
2375-minimum-obstacle-removal-to-reach-corner
2711-minimum-time-to-visit-a-cell-in-a-grid
2794-maximum-number-of-moves-in-a-grid
3227-find-missing-and-repeated-values
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3651-minimum-cost-path-with-teleportations

String Matching

0812-rotate-string
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence

Number Theory

2415-count-the-number-of-ideal-arrays
2610-closest-prime-numbers-in-range
2716-prime-subtraction-operation
3001-apply-operations-to-maximize-score

Queue

0387-first-unique-character-in-a-string
0892-shortest-subarray-with-sum-at-least-k
2180-maximum-number-of-tasks-you-can-assign
2527-count-subarrays-with-fixed-bounds
2868-continuous-subarrays

Monotonic Queue

0892-shortest-subarray-with-sum-at-least-k
2180-maximum-number-of-tasks-you-can-assign
2527-count-subarrays-with-fixed-bounds
2868-continuous-subarrays

Graph

1424-maximum-candies-you-can-get-from-boxes
2201-valid-arrangement-of-pairs
2220-find-all-possible-recipes-from-given-supplies
2375-minimum-obstacle-removal-to-reach-corner
2438-find-closest-node-to-given-two-nodes
2564-most-profitable-path-in-a-tree
2711-minimum-time-to-visit-a-cell-in-a-grid
3189-find-champion-ii
3348-minimum-cost-walk-in-weighted-graph
3517-shortest-distance-after-road-addition-queries-i
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Shortest Path

2375-minimum-obstacle-removal-to-reach-corner
2711-minimum-time-to-visit-a-cell-in-a-grid
2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3650-minimum-cost-path-with-edge-reversals

Eulerian Circuit

2201-valid-arrangement-of-pairs

Ordered Set

2280-count-good-triplets-in-an-array
2868-continuous-subarrays
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Design

1387-find-elements-in-a-contaminated-binary-tree
1995-finding-pairs-with-a-certain-sum

Union Find

3348-minimum-cost-walk-in-weighted-graph

Topological Sort

2220-find-all-possible-recipes-from-given-supplies

Combinatorics

1993-sum-of-all-subset-xor-totals
2415-count-the-number-of-ideal-arrays
3201-distribute-candies-among-children-ii
3548-find-the-count-of-good-integers
3637-count-number-of-balanced-permutations
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements

Binary Indexed Tree

2280-count-good-triplets-in-an-array

Segment Tree

2280-count-good-triplets-in-an-array
3454-separate-squares-ii
3721-longest-balanced-subarray-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair

Merge Sort

2280-count-good-triplets-in-an-array

Hash Function

2079-delete-duplicate-folders-in-system

Brainteaser

2503-longest-subarray-with-maximum-bitwise-and

Bucket Sort

0451-sort-characters-by-frequency

Line Sweep

3454-separate-squares-ii

Geometry

3047-find-the-largest-area-of-square-inside-two-rectangles

Doubly-Linked List

3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Graph Theory

2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
3650-minimum-cost-path-with-edge-reversals

Binary Search Tree

1382-balance-a-binary-search-tree