LeetCode Topics

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0073-set-matrix-zeroes
0217-contains-duplicate
0264-ugly-number-ii
0268-missing-number
0350-intersection-of-two-arrays-ii
0409-longest-palindrome
0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
0648-replace-words
0726-number-of-atoms
0768-partition-labels
0797-rabbits-in-forest
0870-magic-squares-in-grid
0876-hand-of-straights
0905-length-of-longest-fibonacci-subsequence
0906-walking-robot-simulation
0920-uncommon-words-from-two-sentences
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0952-word-subsets
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1016-subarray-sums-divisible-by-k
1044-find-common-characters
1147-flip-columns-for-maximum-number-of-equal-rows
1160-letter-tile-possibilities
1207-delete-nodes-and-return-forest
1217-relative-sort-array
1218-lowest-common-ancestor-of-deepest-leaves
1256-rank-transform-of-an-array
1364-tuple-with-same-product
1370-count-number-of-nice-subarrays
1387-find-elements-in-a-contaminated-binary-tree
1460-number-of-substrings-containing-all-three-characters
1468-check-if-n-and-its-double-exist
1473-find-the-longest-substring-containing-vowels-in-even-counts
1500-count-largest-group
1502-construct-k-palindrome-strings
1510-find-lucky-integer-in-an-array
1556-make-two-arrays-equal-by-reversing-subarrays
1620-check-if-array-pairs-are-divisible-by-k
1694-make-sum-divisible-by-p
1741-sort-array-by-increasing-frequency
1786-count-the-number-of-consistent-strings
1813-maximum-erasure-value
1915-check-if-one-string-swap-can-make-strings-equal
1995-finding-pairs-with-a-certain-sum
2054-the-number-of-the-smallest-unoccupied-chair
2059-unique-length-3-palindromic-subsequences
2107-find-unique-binary-string
2163-kth-distinct-string-in-an-array
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2300-construct-string-with-repeat-limit
2306-create-binary-tree-from-descriptions
2356-largest-combination-with-bitwise-and-greater-than-zero
2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2502-sort-the-people
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
2677-cousins-in-binary-tree-ii
2685-first-completely-painted-row-or-column
2695-find-score-of-an-array-after-marking-all-elements
2707-merge-two-2d-arrays-by-summing-values
2755-extra-characters-in-a-string
2766-find-the-prefix-common-array-of-two-arrays
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
3227-find-missing-and-repeated-values
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3329-find-the-length-of-the-longest-common-prefix
3360-minimum-deletions-to-make-string-k-special
3434-find-the-number-of-distinct-colors-among-the-balls
3445-lexicographically-minimum-string-after-removing-stars
3455-minimum-length-of-string-after-operations
3501-delete-nodes-from-linked-list-present-in-array
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
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
3753-maximum-difference-between-even-and-odd-frequency-i
3788-maximum-unique-subarray-sum-after-deletion

String

0003-longest-substring-without-repeating-characters
0038-count-and-say
0179-largest-number
0214-shortest-palindrome
0241-different-ways-to-add-parentheses
0409-longest-palindrome
0539-minimum-time-difference
0567-permutation-in-string
0592-fraction-addition-and-subtraction
0648-replace-words
0664-strange-printer
0726-number-of-atoms
0768-partition-labels
0812-rotate-string
0920-uncommon-words-from-two-sentences
0952-word-subsets
0957-minimum-add-to-make-parentheses-valid
1044-find-common-characters
1058-lexicographically-smallest-equivalent-string
1160-letter-tile-possibilities
1170-shortest-common-supersequence
1197-parsing-a-boolean-expression
1302-delete-characters-to-make-fancy-string
1304-longest-happy-string
1350-remove-sub-folders-from-the-filesystem
1460-number-of-substrings-containing-all-three-characters
1473-find-the-longest-substring-containing-vowels-in-even-counts
1502-construct-k-palindrome-strings
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1524-string-matching-in-an-array
1537-maximum-score-after-splitting-a-string
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1667-find-kth-bit-in-nth-binary-string
1720-crawler-log-folder
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1786-count-the-number-of-consistent-strings
1818-maximum-score-from-removing-substrings
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1915-check-if-one-string-swap-can-make-strings-equal
1923-sentence-similarity-iii
2021-remove-all-occurrences-of-a-substring
2059-unique-length-3-palindromic-subsequences
2076-sum-of-digits-of-string-after-convert
2095-minimum-number-of-swaps-to-make-the-string-balanced
2107-find-unique-binary-string
2163-kth-distinct-string-in-an-array
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2220-find-all-possible-recipes-from-given-supplies
2221-check-if-a-parentheses-string-can-be-valid
2232-adding-spaces-to-a-string
2237-longest-palindrome-by-concatenating-two-letter-words
2260-divide-a-string-into-groups-of-size-k
2292-counting-words-with-a-given-prefix
2300-construct-string-with-repeat-limit
2395-longest-binary-subsequence-less-than-or-equal-to-k
2414-move-pieces-to-obtain-a-string
2465-shifting-letters-ii
2494-sum-of-prefix-scores-of-strings
2502-sort-the-people
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
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
2800-minimum-string-length-after-removing-substrings
3018-make-string-a-subsequence-using-cyclic-increments
3143-longest-unequal-adjacent-groups-subsequence-i
3174-minimum-number-of-changes-to-make-binary-string-beautiful
3195-separate-black-and-white-balls
3235-minimum-cost-to-convert-string-i
3243-count-the-number-of-powerful-integers
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3309-count-prefix-and-suffix-pairs-i
3329-find-the-length-of-the-longest-common-prefix
3360-minimum-deletions-to-make-string-k-special
3396-valid-word
3445-lexicographically-minimum-string-after-removing-stars
3447-clear-digits
3451-string-compression-iii
3455-minimum-length-of-string-after-operations
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3617-find-the-original-typed-string-i
3629-total-characters-in-string-after-transformations-i
3753-maximum-difference-between-even-and-odd-frequency-i

Greedy

0011-container-with-most-water
0135-candy
0179-largest-number
0330-patching-array
0409-longest-palindrome
0502-ipo
0624-maximum-distance-in-arrays
0632-smallest-range-covering-elements-from-k-lists
0670-maximum-swap
0768-partition-labels
0780-max-chunks-to-make-sorted
0797-rabbits-in-forest
0853-most-profit-assigning-work
0876-hand-of-straights
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
0982-minimum-increment-to-make-array-unique
1049-minimum-domino-rotations-for-equal-row
1285-balance-a-binary-search-tree
1304-longest-happy-string
1502-construct-k-palindrome-strings
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1711-find-valid-matrix-given-row-and-column-sums
1766-minimum-number-of-removals-to-make-mountain-array
1818-maximum-score-from-removing-substrings
1917-maximum-average-pass-ratio
2089-maximum-matrix-sum
2095-minimum-number-of-swaps-to-make-the-string-balanced
2148-minimum-number-of-moves-to-seat-everyone
2180-maximum-number-of-tasks-you-can-assign
2221-check-if-a-parentheses-string-can-be-valid
2237-longest-palindrome-by-concatenating-two-letter-words
2300-construct-string-with-repeat-limit
2379-maximum-total-importance-of-roads
2395-longest-binary-subsequence-less-than-or-equal-to-k
2488-divide-intervals-into-minimum-number-of-groups
2509-minimize-xor
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
2716-prime-subtraction-operation
2720-minimize-the-maximum-difference-of-pairs
3143-longest-unequal-adjacent-groups-subsequence-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3195-separate-black-and-white-balls
3276-minimum-number-of-pushes-to-type-word-ii
3360-minimum-deletions-to-make-string-k-special
3445-lexicographically-minimum-string-after-removing-stars
3647-zero-array-transformation-iii
3788-maximum-unique-subarray-sum-after-deletion

Array

0001-two-sum
0011-container-with-most-water
0015-3sum
0033-search-in-rotated-sorted-array
0040-combination-sum-ii
0053-maximum-subarray
0073-set-matrix-zeroes
0075-sort-colors
0078-subsets
0121-best-time-to-buy-and-sell-stock
0135-candy
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0179-largest-number
0217-contains-duplicate
0238-product-of-array-except-self
0268-missing-number
0330-patching-array
0350-intersection-of-two-arrays-ii
0368-largest-divisible-subset
0407-trapping-rain-water-ii
0416-partition-equal-subset-sum
0494-target-sum
0502-ipo
0539-minimum-time-difference
0624-maximum-distance-in-arrays
0632-smallest-range-covering-elements-from-k-lists
0648-replace-words
0689-maximum-sum-of-3-non-overlapping-subarrays
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0780-max-chunks-to-make-sorted
0797-rabbits-in-forest
0853-most-profit-assigning-work
0854-making-a-large-island
0859-design-circular-deque
0870-magic-squares-in-grid
0876-hand-of-straights
0890-lemonade-change
0892-shortest-subarray-with-sum-at-least-k
0905-length-of-longest-fibonacci-subsequence
0906-walking-robot-simulation
0921-spiral-matrix-iii
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0948-sort-an-array
0952-word-subsets
0982-minimum-increment-to-make-array-unique
0999-regions-cut-by-slashes
1002-maximum-width-ramp
1016-subarray-sums-divisible-by-k
1025-minimum-cost-for-tickets
1037-minimum-number-of-k-consecutive-bit-flips
1044-find-common-characters
1049-minimum-domino-rotations-for-equal-row
1063-best-sightseeing-pair
1137-height-checker
1138-grumpy-bookstore-owner
1147-flip-columns-for-maximum-number-of-equal-rows
1196-filling-bookcase-shelves
1207-delete-nodes-and-return-forest
1217-relative-sort-array
1240-stone-game-ii
1256-rank-transform-of-an-array
1293-three-consecutive-odds
1325-path-with-maximum-probability
1333-sort-the-jumbled-numbers
1335-maximum-candies-allocated-to-k-children
1350-remove-sub-folders-from-the-filesystem
1364-tuple-with-same-product
1370-count-number-of-nice-subarrays
1396-count-servers-that-communicate
1402-count-square-submatrices-with-all-ones
1421-find-numbers-with-even-number-of-digits
1435-xor-queries-of-a-subarray
1468-check-if-n-and-its-double-exist
1477-product-of-the-last-k-numbers
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1496-lucky-numbers-in-a-matrix
1497-design-a-stack-with-increment-operation
1510-find-lucky-integer-in-an-array
1511-count-number-of-teams
1524-string-matching-in-an-array
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1556-make-two-arrays-equal-by-reversing-subarrays
1570-final-prices-with-a-special-discount-in-a-shop
1605-minimum-number-of-days-to-make-m-bouquets
1615-range-sum-of-sorted-subarray-sums
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
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
1675-magnetic-force-between-two-balls
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1691-minimum-number-of-days-to-disconnect-island
1694-make-sum-divisible-by-p
1711-find-valid-matrix-given-row-and-column-sums
1720-crawler-log-folder
1741-sort-array-by-increasing-frequency
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1755-defuse-the-bomb
1766-minimum-number-of-removals-to-make-mountain-array
1786-count-the-number-of-consistent-strings
1803-average-waiting-time
1813-maximum-erasure-value
1819-construct-the-lexicographically-largest-valid-sequence
1849-maximum-absolute-sum-of-any-subarray
1851-maximum-number-of-events-that-can-be-attended-ii
1876-map-of-highest-peak
1878-check-if-array-is-sorted-and-rotated
1886-minimum-limit-of-balls-in-a-bag
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1917-maximum-average-pass-ratio
1923-sentence-similarity-iii
1927-maximum-ascending-subarray-sum
1940-maximum-xor-for-each-query
1951-find-the-winner-of-the-circular-game
1972-rotating-the-box
1993-sum-of-all-subset-xor-totals
1995-finding-pairs-with-a-certain-sum
2006-find-the-student-that-will-replace-the-chalk
2035-count-sub-islands
2048-build-array-from-permutation
2054-the-number-of-the-smallest-unoccupied-chair
2067-maximum-number-of-points-with-cost
2089-maximum-matrix-sum
2107-find-unique-binary-string
2132-convert-1d-array-into-2d-array
2144-maximum-difference-between-increasing-elements
2145-grid-game
2148-minimum-number-of-moves-to-seat-everyone
2155-find-missing-observations
2160-minimum-operations-to-make-a-uni-value-grid
2163-kth-distinct-string-in-an-array
2170-count-number-of-maximum-bitwise-or-subsets
2180-maximum-number-of-tasks-you-can-assign
2188-minimized-maximum-of-products-distributed-to-any-store
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2232-adding-spaces-to-a-string
2237-longest-palindrome-by-concatenating-two-letter-words
2255-minimum-swaps-to-group-all-1s-together-ii
2262-solving-questions-with-brainpower
2265-partition-array-according-to-given-pivot
2277-count-equal-and-divisible-pairs-in-an-array
2280-count-good-triplets-in-an-array
2292-counting-words-with-a-given-prefix
2306-create-binary-tree-from-descriptions
2343-count-unguarded-cells-in-the-grid
2356-largest-combination-with-bitwise-and-greater-than-zero
2358-number-of-ways-to-split-array
2375-minimum-obstacle-removal-to-reach-corner
2411-spiral-matrix-iv
2465-shifting-letters-ii
2472-build-a-matrix-with-conditions
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2478-longest-nice-subarray
2488-divide-intervals-into-minimum-number-of-groups
2494-sum-of-prefix-scores-of-strings
2502-sort-the-people
2503-longest-subarray-with-maximum-bitwise-and
2533-bitwise-xor-of-all-pairings
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
2588-maximum-number-of-points-from-grid-queries
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
2685-first-completely-painted-row-or-column
2690-house-robber-iv
2691-count-vowel-strings-in-ranges
2692-take-gifts-from-the-richest-pile
2695-find-score-of-an-array-after-marking-all-elements
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
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
2764-maximum-number-of-fish-in-a-grid
2766-find-the-prefix-common-array-of-two-arrays
2794-maximum-number-of-moves-in-a-grid
2846-robot-collisions
2856-count-complete-subarrays-in-an-array
2868-continuous-subarrays
2888-minimum-index-of-a-valid-split
3143-longest-unequal-adjacent-groups-subsequence-i
3152-maximum-value-of-an-ordered-triplet-ii
3154-maximum-value-of-an-ordered-triplet-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3181-find-building-where-alice-and-bob-can-meet
3219-make-lexicographically-smallest-array-by-swapping-elements
3227-find-missing-and-repeated-values
3235-minimum-cost-to-convert-string-i
3291-find-if-array-can-be-sorted
3309-count-prefix-and-suffix-pairs-i
3321-type-of-triangle
3329-find-the-length-of-the-longest-common-prefix
3332-minimum-operations-to-exceed-threshold-value-ii
3348-minimum-cost-walk-in-weighted-graph
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3380-shortest-subarray-with-or-at-least-k-ii
3427-special-array-ii
3429-special-array-i
3430-count-days-without-meetings
3434-find-the-number-of-distinct-colors-among-the-balls
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3501-delete-nodes-from-linked-list-present-in-array
3517-shortest-distance-after-road-addition-queries-i
3555-final-array-state-after-k-multiplication-operations-i
3621-minimum-operations-to-make-array-values-equal-to-k
3639-zero-array-transformation-i
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3657-check-if-grid-can-be-cut-into-sections
3685-count-subarrays-of-length-three-with-a-condition
3788-maximum-unique-subarray-sum-after-deletion

Sorting

0015-3sum
0075-sort-colors
0179-largest-number
0217-contains-duplicate
0268-missing-number
0350-intersection-of-two-arrays-ii
0368-largest-divisible-subset
0502-ipo
0539-minimum-time-difference
0632-smallest-range-covering-elements-from-k-lists
0719-find-k-th-smallest-pair-distance
0726-number-of-atoms
0780-max-chunks-to-make-sorted
0853-most-profit-assigning-work
0876-hand-of-straights
0948-sort-an-array
0982-minimum-increment-to-make-array-unique
1137-height-checker
1217-relative-sort-array
1256-rank-transform-of-an-array
1333-sort-the-jumbled-numbers
1468-check-if-n-and-its-double-exist
1556-make-two-arrays-equal-by-reversing-subarrays
1615-range-sum-of-sorted-subarray-sums
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1675-magnetic-force-between-two-balls
1741-sort-array-by-increasing-frequency
1851-maximum-number-of-events-that-can-be-attended-ii
2148-minimum-number-of-moves-to-seat-everyone
2160-minimum-operations-to-make-a-uni-value-grid
2180-maximum-number-of-tasks-you-can-assign
2215-finding-3-digit-even-numbers
2379-maximum-total-importance-of-roads
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2488-divide-intervals-into-minimum-number-of-groups
2502-sort-the-people
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2588-maximum-number-of-points-from-grid-queries
2640-maximum-number-of-integers-to-choose-from-a-range-i
2646-kth-largest-sum-in-a-binary-tree
2681-put-marbles-in-bags
2695-find-score-of-an-array-after-marking-all-elements
2699-count-the-number-of-fair-pairs
2846-robot-collisions
2888-minimum-index-of-a-valid-split
3219-make-lexicographically-smallest-array-by-swapping-elements
3276-minimum-number-of-pushes-to-type-word-ii
3291-find-if-array-can-be-sorted
3321-type-of-triangle
3360-minimum-deletions-to-make-string-k-special
3430-count-days-without-meetings
3647-zero-array-transformation-iii
3657-check-if-grid-can-be-cut-into-sections

Trie

0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
0648-replace-words
1350-remove-sub-folders-from-the-filesystem
2494-sum-of-prefix-scores-of-strings
2755-extra-characters-in-a-string
3309-count-prefix-and-suffix-pairs-i
3329-find-the-length-of-the-longest-common-prefix

Depth-First Search

0104-maximum-depth-of-binary-tree
0111-minimum-depth-of-binary-tree
0145-binary-tree-postorder-traversal
0207-course-schedule
0236-lowest-common-ancestor-of-a-binary-tree
0386-lexicographical-numbers
0515-find-largest-value-in-each-tree-row
0684-redundant-connection
0776-n-ary-tree-postorder-traversal
0820-find-eventual-safe-states
0854-making-a-large-island
0984-most-stones-removed-with-same-row-or-column
0988-flip-equivalent-binary-trees
0999-regions-cut-by-slashes
1114-binary-search-tree-to-greater-sum-tree
1207-delete-nodes-and-return-forest
1218-lowest-common-ancestor-of-deepest-leaves
1285-balance-a-binary-search-tree
1350-remove-sub-folders-from-the-filesystem
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1484-linked-list-in-binary-tree
1558-course-schedule-iv
1653-number-of-good-leaf-nodes-pairs
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands
2201-valid-arrangement-of-pairs
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2493-reverse-odd-levels-of-binary-tree
2564-most-profitable-path-in-a-tree
2677-cousins-in-binary-tree-ii
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3058-maximum-number-of-k-divisible-components
3439-find-minimum-diameter-after-merging-two-trees

Breadth-First Search

0104-maximum-depth-of-binary-tree
0111-minimum-depth-of-binary-tree
0207-course-schedule
0407-trapping-rain-water-ii
0515-find-largest-value-in-each-tree-row
0684-redundant-connection
0820-find-eventual-safe-states
0854-making-a-large-island
0999-regions-cut-by-slashes
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1484-linked-list-in-binary-tree
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1558-course-schedule-iv
1691-minimum-number-of-days-to-disconnect-island
1876-map-of-highest-peak
2035-count-sub-islands
2171-second-minimum-time-to-reach-destination
2375-minimum-obstacle-removal-to-reach-corner
2493-reverse-odd-levels-of-binary-tree
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2564-most-profitable-path-in-a-tree
2588-maximum-number-of-points-from-grid-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii
2711-minimum-time-to-visit-a-cell-in-a-grid
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3439-find-minimum-diameter-after-merging-two-trees
3517-shortest-distance-after-road-addition-queries-i

Graph

0207-course-schedule
0684-redundant-connection
0820-find-eventual-safe-states
0984-most-stones-removed-with-same-row-or-column
1325-path-with-maximum-probability
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1558-course-schedule-iv
1701-remove-max-number-of-edges-to-keep-graph-fully-traversable
1916-find-center-of-star-graph
2090-number-of-ways-to-arrive-at-destination
2171-second-minimum-time-to-reach-destination
2201-valid-arrangement-of-pairs
2220-find-all-possible-recipes-from-given-supplies
2375-minimum-obstacle-removal-to-reach-corner
2379-maximum-total-importance-of-roads
2472-build-a-matrix-with-conditions
2564-most-profitable-path-in-a-tree
2711-minimum-time-to-visit-a-cell-in-a-grid
2793-count-the-number-of-complete-components
2803-modify-graph-edge-weights
3189-find-champion-ii
3235-minimum-cost-to-convert-string-i
3348-minimum-cost-walk-in-weighted-graph
3439-find-minimum-diameter-after-merging-two-trees
3517-shortest-distance-after-road-addition-queries-i

Topological Sort

0207-course-schedule
0820-find-eventual-safe-states
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1558-course-schedule-iv
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2472-build-a-matrix-with-conditions

Union Find

0684-redundant-connection
0854-making-a-large-island
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1058-lexicographically-smallest-equivalent-string
1396-count-servers-that-communicate
1701-remove-max-number-of-edges-to-keep-graph-fully-traversable
2035-count-sub-islands
2588-maximum-number-of-points-from-grid-queries
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3219-make-lexicographically-smallest-array-by-swapping-elements
3348-minimum-cost-walk-in-weighted-graph

Prefix Sum

0238-product-of-array-except-self
0731-my-calendar-ii
0892-shortest-subarray-with-sum-at-least-k
1016-subarray-sums-divisible-by-k
1037-minimum-number-of-k-consecutive-bit-flips
1240-stone-game-ii
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1477-product-of-the-last-k-numbers
1537-maximum-score-after-splitting-a-string
1631-number-of-sub-arrays-with-odd-sum
1694-make-sum-divisible-by-p
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1940-maximum-xor-for-each-query
2006-find-the-student-that-will-replace-the-chalk
2059-unique-length-3-palindromic-subsequences
2145-grid-game
2358-number-of-ways-to-split-array
2465-shifting-letters-ii
2488-divide-intervals-into-minimum-number-of-groups
2691-count-vowel-strings-in-ranges
3427-special-array-ii
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3639-zero-array-transformation-i
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii

Counting Sort

0920-uncommon-words-from-two-sentences
0948-sort-an-array
0982-minimum-increment-to-make-array-unique
1137-height-checker
1160-letter-tile-possibilities
1217-relative-sort-array
1364-tuple-with-same-product
1396-count-servers-that-communicate
1502-construct-k-palindrome-strings
1510-find-lucky-integer-in-an-array
1620-check-if-array-pairs-are-divisible-by-k
1786-count-the-number-of-consistent-strings
1915-check-if-one-string-swap-can-make-strings-equal
2163-kth-distinct-string-in-an-array
2237-longest-palindrome-by-concatenating-two-letter-words
2300-construct-string-with-repeat-limit
2356-largest-combination-with-bitwise-and-greater-than-zero
2494-sum-of-prefix-scores-of-strings
2614-maximum-count-of-positive-integer-and-negative-integer
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3360-minimum-deletions-to-make-string-k-special
3455-minimum-length-of-string-after-operations
3629-total-characters-in-string-after-transformations-i
3753-maximum-difference-between-even-and-odd-frequency-i

Two Pointers

0011-container-with-most-water
0015-3sum
0075-sort-colors
0350-intersection-of-two-arrays-ii
0567-permutation-in-string
0633-sum-of-square-numbers
0719-find-k-th-smallest-pair-distance
0768-partition-labels
0853-most-profit-assigning-work
1468-check-if-n-and-its-double-exist
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1615-range-sum-of-sorted-subarray-sums
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1679-shortest-subarray-to-be-removed-to-make-array-sorted
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
2414-move-pieces-to-obtain-a-string
2488-divide-intervals-into-minimum-number-of-groups
2581-divide-players-into-teams-of-equal-skill
2588-maximum-number-of-points-from-grid-queries
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
3018-make-string-a-subsequence-using-cyclic-increments
3195-separate-black-and-white-balls

Heap (Priority Queue)

0264-ugly-number-ii
0407-trapping-rain-water-ii
0502-ipo
0632-smallest-range-covering-elements-from-k-lists
0789-kth-largest-element-in-a-stream
0892-shortest-subarray-with-sum-at-least-k
0948-sort-an-array
1304-longest-happy-string
1325-path-with-maximum-probability
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1917-maximum-average-pass-ratio
2054-the-number-of-the-smallest-unoccupied-chair
2300-construct-string-with-repeat-limit
2375-minimum-obstacle-removal-to-reach-corner
2379-maximum-total-importance-of-roads
2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2488-divide-intervals-into-minimum-number-of-groups
2588-maximum-number-of-points-from-grid-queries
2616-maximal-score-after-applying-k-operations
2681-put-marbles-in-bags
2692-take-gifts-from-the-richest-pile
2695-find-score-of-an-array-after-marking-all-elements
2711-minimum-time-to-visit-a-cell-in-a-grid
2803-modify-graph-edge-weights
2868-continuous-subarrays
3181-find-building-where-alice-and-bob-can-meet
3332-minimum-operations-to-exceed-threshold-value-ii
3445-lexicographically-minimum-string-after-removing-stars
3555-final-array-state-after-k-multiplication-operations-i
3647-zero-array-transformation-iii

Binary Search

0033-search-in-rotated-sorted-array
0153-find-minimum-in-rotated-sorted-array
0268-missing-number
0350-intersection-of-two-arrays-ii
0633-sum-of-square-numbers
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0853-most-profit-assigning-work
0892-shortest-subarray-with-sum-at-least-k
1335-maximum-candies-allocated-to-k-children
1468-check-if-n-and-its-double-exist
1605-minimum-number-of-days-to-make-m-bouquets
1615-range-sum-of-sorted-subarray-sums
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1675-magnetic-force-between-two-balls
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
2006-find-the-student-that-will-replace-the-chalk
2180-maximum-number-of-tasks-you-can-assign
2188-minimized-maximum-of-products-distributed-to-any-store
2280-count-good-triplets-in-an-array
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
3181-find-building-where-alice-and-bob-can-meet
3267-find-longest-special-substring-that-occurs-thrice-i
3427-special-array-ii
3643-zero-array-transformation-ii

Math

0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0268-missing-number
0368-largest-divisible-subset
0371-sum-of-two-integers
0539-minimum-time-difference
0592-fraction-addition-and-subtraction
0633-sum-of-square-numbers
0650-2-keys-keyboard
0670-maximum-swap
0797-rabbits-in-forest
0870-magic-squares-in-grid
1240-stone-game-ii
1370-count-number-of-nice-subarrays
1421-find-numbers-with-even-number-of-digits
1477-product-of-the-last-k-numbers
1500-count-largest-group
1631-number-of-sub-arrays-with-odd-sum
1642-water-bottles
1889-check-if-number-is-a-sum-of-powers-of-three
1951-find-the-winner-of-the-circular-game
1993-sum-of-all-subset-xor-totals
2050-count-good-numbers
2155-find-missing-observations
2160-minimum-operations-to-make-a-uni-value-grid
2610-closest-prime-numbers-in-range
2645-pass-the-pillow
2649-count-total-number-of-colored-cells
2716-prime-subtraction-operation
2802-find-the-punishment-number-of-an-integer
2903-insert-greatest-common-divisors-in-linked-list
2998-count-symmetric-integers
3056-determine-if-a-cell-is-reachable-at-a-given-time
3172-divisible-and-non-divisible-sums-difference
3227-find-missing-and-repeated-values
3243-count-the-number-of-powerful-integers
3321-type-of-triangle
3555-final-array-state-after-k-multiplication-operations-i
3600-find-the-k-th-character-in-string-game-i
3629-total-characters-in-string-after-transformations-i

Sliding Window

0003-longest-substring-without-repeating-characters
0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
0892-shortest-subarray-with-sum-at-least-k
1037-minimum-number-of-k-consecutive-bit-flips
1138-grumpy-bookstore-owner
1370-count-number-of-nice-subarrays
1460-number-of-substrings-containing-all-three-characters
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1755-defuse-the-bomb
1813-maximum-erasure-value
2255-minimum-swaps-to-group-all-1s-together-ii
2478-longest-nice-subarray
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
3267-find-longest-special-substring-that-occurs-thrice-i
3380-shortest-subarray-with-or-at-least-k-ii
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii

Queue

0859-design-circular-deque
0892-shortest-subarray-with-sum-at-least-k
1037-minimum-number-of-k-consecutive-bit-flips
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1951-find-the-winner-of-the-circular-game
2180-maximum-number-of-tasks-you-can-assign
2868-continuous-subarrays
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Ordered Set

0729-my-calendar-i
0731-my-calendar-ii
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2280-count-good-triplets-in-an-array
2434-design-a-number-container-system
2868-continuous-subarrays

Monotonic Queue

0892-shortest-subarray-with-sum-at-least-k
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2180-maximum-number-of-tasks-you-can-assign
2868-continuous-subarrays

Bit Manipulation

0078-subsets
0190-reverse-bits
0191-number-of-1-bits
0268-missing-number
0338-counting-bits
0371-sum-of-two-integers
0476-number-complement
1037-minimum-number-of-k-consecutive-bit-flips
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1786-count-the-number-of-consistent-strings
1940-maximum-xor-for-each-query
1993-sum-of-all-subset-xor-totals
2059-unique-length-3-palindromic-subsequences
2170-count-number-of-maximum-bitwise-or-subsets
2323-minimum-bit-flips-to-convert-number
2356-largest-combination-with-bitwise-and-greater-than-zero
2478-longest-nice-subarray
2503-longest-subarray-with-maximum-bitwise-and
2509-minimize-xor
2533-bitwise-xor-of-all-pairings
2766-find-the-prefix-common-array-of-two-arrays
3291-find-if-array-can-be-sorted
3348-minimum-cost-walk-in-weighted-graph
3380-shortest-subarray-with-or-at-least-k-ii
3394-minimum-array-end
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3600-find-the-k-th-character-in-string-game-i

Tree

0104-maximum-depth-of-binary-tree
0111-minimum-depth-of-binary-tree
0145-binary-tree-postorder-traversal
0236-lowest-common-ancestor-of-a-binary-tree
0515-find-largest-value-in-each-tree-row
0776-n-ary-tree-postorder-traversal
0789-kth-largest-element-in-a-stream
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0988-flip-equivalent-binary-trees
1114-binary-search-tree-to-greater-sum-tree
1207-delete-nodes-and-return-forest
1218-lowest-common-ancestor-of-deepest-leaves
1285-balance-a-binary-search-tree
1387-find-elements-in-a-contaminated-binary-tree
1484-linked-list-in-binary-tree
1653-number-of-good-leaf-nodes-pairs
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2306-create-binary-tree-from-descriptions
2493-reverse-odd-levels-of-binary-tree
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2564-most-profitable-path-in-a-tree
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii
3058-maximum-number-of-k-divisible-components
3439-find-minimum-diameter-after-merging-two-trees

Binary Search Tree

0789-kth-largest-element-in-a-stream
1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Binary Tree

0104-maximum-depth-of-binary-tree
0111-minimum-depth-of-binary-tree
0145-binary-tree-postorder-traversal
0236-lowest-common-ancestor-of-a-binary-tree
0515-find-largest-value-in-each-tree-row
0789-kth-largest-element-in-a-stream
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0988-flip-equivalent-binary-trees
1114-binary-search-tree-to-greater-sum-tree
1207-delete-nodes-and-return-forest
1218-lowest-common-ancestor-of-deepest-leaves
1285-balance-a-binary-search-tree
1387-find-elements-in-a-contaminated-binary-tree
1484-linked-list-in-binary-tree
1653-number-of-good-leaf-nodes-pairs
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2306-create-binary-tree-from-descriptions
2493-reverse-odd-levels-of-binary-tree
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Divide and Conquer

0053-maximum-subarray
0190-reverse-bits
0191-number-of-1-bits
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0948-sort-an-array
1285-balance-a-binary-search-tree
2280-count-good-triplets-in-an-array

Linked List

0725-split-linked-list-in-parts
0859-design-circular-deque
1484-linked-list-in-binary-tree
2182-find-the-minimum-and-maximum-number-of-nodes-between-critical-points
2299-merge-nodes-in-between-zeros
2411-spiral-matrix-iv
2903-insert-greatest-common-divisors-in-linked-list
3501-delete-nodes-from-linked-list-present-in-array

Simulation

0592-fraction-addition-and-subtraction
0906-walking-robot-simulation
0921-spiral-matrix-iii
1642-water-bottles
1667-find-kth-bit-in-nth-binary-string
1803-average-waiting-time
1951-find-the-winner-of-the-circular-game
2006-find-the-student-that-will-replace-the-chalk
2021-remove-all-occurrences-of-a-substring
2048-build-array-from-permutation
2076-sum-of-digits-of-string-after-convert
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2232-adding-spaces-to-a-string
2260-divide-a-string-into-groups-of-size-k
2265-partition-array-according-to-given-pivot
2299-merge-nodes-in-between-zeros
2343-count-unguarded-cells-in-the-grid
2411-spiral-matrix-iv
2645-pass-the-pillow
2692-take-gifts-from-the-richest-pile
2695-find-score-of-an-array-after-marking-all-elements
2800-minimum-string-length-after-removing-substrings
2846-robot-collisions
3332-minimum-operations-to-exceed-threshold-value-ii
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits
3555-final-array-state-after-k-multiplication-operations-i
3600-find-the-k-th-character-in-string-game-i

Recursion

0241-different-ways-to-add-parentheses
1197-parsing-a-boolean-expression
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game
2050-count-good-numbers
3600-find-the-k-th-character-in-string-game-i

Stack

0145-binary-tree-postorder-traversal
0726-number-of-atoms
0776-n-ary-tree-postorder-traversal
0780-max-chunks-to-make-sorted
0957-minimum-add-to-make-parentheses-valid
1002-maximum-width-ramp
1197-parsing-a-boolean-expression
1497-design-a-stack-with-increment-operation
1570-final-prices-with-a-special-discount-in-a-shop
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1720-crawler-log-folder
1818-maximum-score-from-removing-substrings
2021-remove-all-occurrences-of-a-substring
2095-minimum-number-of-swaps-to-make-the-string-balanced
2221-check-if-a-parentheses-string-can-be-valid
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2800-minimum-string-length-after-removing-substrings
2846-robot-collisions
3181-find-building-where-alice-and-bob-can-meet
3445-lexicographically-minimum-string-after-removing-stars
3447-clear-digits

Matrix

0073-set-matrix-zeroes
0407-trapping-rain-water-ii
0854-making-a-large-island
0870-magic-squares-in-grid
0921-spiral-matrix-iii
0999-regions-cut-by-slashes
1147-flip-columns-for-maximum-number-of-equal-rows
1396-count-servers-that-communicate
1402-count-square-submatrices-with-all-ones
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1496-lucky-numbers-in-a-matrix
1691-minimum-number-of-days-to-disconnect-island
1711-find-valid-matrix-given-row-and-column-sums
1876-map-of-highest-peak
1972-rotating-the-box
2035-count-sub-islands
2089-maximum-matrix-sum
2132-convert-1d-array-into-2d-array
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2343-count-unguarded-cells-in-the-grid
2375-minimum-obstacle-removal-to-reach-corner
2411-spiral-matrix-iv
2472-build-a-matrix-with-conditions
2588-maximum-number-of-points-from-grid-queries
2685-first-completely-painted-row-or-column
2711-minimum-time-to-visit-a-cell-in-a-grid
2764-maximum-number-of-fish-in-a-grid
2794-maximum-number-of-moves-in-a-grid
3227-find-missing-and-repeated-values

Merge Sort

0948-sort-an-array
2280-count-good-triplets-in-an-array

Bucket Sort

0948-sort-an-array

Radix Sort

0948-sort-an-array

Dynamic Programming

0053-maximum-subarray
0121-best-time-to-buy-and-sell-stock
0152-maximum-product-subarray
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0338-counting-bits
0368-largest-divisible-subset
0416-partition-equal-subset-sum
0494-target-sum
0650-2-keys-keyboard
0664-strange-printer
0689-maximum-sum-of-3-non-overlapping-subarrays
0905-length-of-longest-fibonacci-subsequence
1025-minimum-cost-for-tickets
1063-best-sightseeing-pair
1170-shortest-common-supersequence
1196-filling-bookcase-shelves
1240-stone-game-ii
1402-count-square-submatrices-with-all-ones
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1511-count-number-of-teams
1631-number-of-sub-arrays-with-odd-sum
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
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
2067-maximum-number-of-points-with-cost
2090-number-of-ways-to-arrive-at-destination
2262-solving-questions-with-brainpower
2395-longest-binary-subsequence-less-than-or-equal-to-k
2554-minimum-total-distance-traveled
2562-count-ways-to-build-good-strings
2586-longest-square-streak-in-an-array
2755-extra-characters-in-a-string
2794-maximum-number-of-moves-in-a-grid
3143-longest-unequal-adjacent-groups-subsequence-i
3243-count-the-number-of-powerful-integers
3629-total-characters-in-string-after-transformations-i

Shortest Path

1325-path-with-maximum-probability
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2090-number-of-ways-to-arrive-at-destination
2171-second-minimum-time-to-reach-destination
2375-minimum-obstacle-removal-to-reach-corner
2711-minimum-time-to-visit-a-cell-in-a-grid
2803-modify-graph-edge-weights
3235-minimum-cost-to-convert-string-i

Binary Indexed Tree

1511-count-number-of-teams
2280-count-good-triplets-in-an-array
3181-find-building-where-alice-and-bob-can-meet

Strongly Connected Component

1691-minimum-number-of-days-to-disconnect-island

Design

0729-my-calendar-i
0731-my-calendar-ii
0789-kth-largest-element-in-a-stream
0859-design-circular-deque
1387-find-elements-in-a-contaminated-binary-tree
1477-product-of-the-last-k-numbers
1497-design-a-stack-with-increment-operation
1995-finding-pairs-with-a-certain-sum
2434-design-a-number-container-system

Data Stream

0789-kth-largest-element-in-a-stream
1477-product-of-the-last-k-numbers

Backtracking

0040-combination-sum-ii
0078-subsets
0494-target-sum
1160-letter-tile-possibilities
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1819-construct-the-lexicographically-largest-valid-sequence
1993-sum-of-all-subset-xor-totals
2107-find-unique-binary-string
2170-count-number-of-maximum-bitwise-or-subsets
2802-find-the-punishment-number-of-an-integer

Game Theory

1240-stone-game-ii

Number Theory

2610-closest-prime-numbers-in-range
2716-prime-subtraction-operation
2903-insert-greatest-common-divisors-in-linked-list

Brainteaser

2503-longest-subarray-with-maximum-bitwise-and
2533-bitwise-xor-of-all-pairings

Memoization

0241-different-ways-to-add-parentheses
2395-longest-binary-subsequence-less-than-or-equal-to-k

Rolling Hash

0214-shortest-palindrome
3309-count-prefix-and-suffix-pairs-i

String Matching

0214-shortest-palindrome
0812-rotate-string
1524-string-matching-in-an-array
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
2292-counting-words-with-a-given-prefix
3309-count-prefix-and-suffix-pairs-i

Hash Function

0214-shortest-palindrome
3309-count-prefix-and-suffix-pairs-i

Segment Tree

0729-my-calendar-i
0731-my-calendar-ii
2280-count-good-triplets-in-an-array
3181-find-building-where-alice-and-bob-can-meet

Monotonic Stack

0780-max-chunks-to-make-sorted
1002-maximum-width-ramp
1570-final-prices-with-a-special-discount-in-a-shop
1679-shortest-subarray-to-be-removed-to-make-array-sorted
3181-find-building-where-alice-and-bob-can-meet

Enumeration

1656-count-good-triplets
1993-sum-of-all-subset-xor-totals
2170-count-number-of-maximum-bitwise-or-subsets
2215-finding-3-digit-even-numbers
2998-count-symmetric-integers

Eulerian Circuit

2201-valid-arrangement-of-pairs

Combinatorics

1993-sum-of-all-subset-xor-totals