Interview_DS_Algo

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

LeetCode Topics

Dynamic Programming

0042-trapping-rain-water
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0494-target-sum
0650-2-keys-keyboard
0664-strange-printer
0689-maximum-sum-of-3-non-overlapping-subarrays
1025-minimum-cost-for-tickets
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
1756-minimum-deletions-to-make-string-balanced
1766-minimum-number-of-removals-to-make-mountain-array
2164-two-best-non-overlapping-events
2554-minimum-total-distance-traveled
2562-count-ways-to-build-good-strings
2755-extra-characters-in-a-string
2794-maximum-number-of-moves-in-a-grid

Graph

0684-redundant-connection
0820-find-eventual-safe-states
0984-most-stones-removed-with-same-row-or-column
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
2171-second-minimum-time-to-reach-destination
2201-valid-arrangement-of-pairs
2246-maximum-employees-to-be-invited-to-a-meeting
2375-minimum-obstacle-removal-to-reach-corner
2711-minimum-time-to-visit-a-cell-in-a-grid
2803-modify-graph-edge-weights
3189-find-champion-ii
3235-minimum-cost-to-convert-string-i
3439-find-minimum-diameter-after-merging-two-trees
3517-shortest-distance-after-road-addition-queries-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
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

Array

0001-two-sum
0040-combination-sum-ii
0042-trapping-rain-water
0049-group-anagrams
0059-spiral-matrix-ii
0179-largest-number
0216-combination-sum-iii
0494-target-sum
0539-minimum-time-difference
0632-smallest-range-covering-elements-from-k-lists
0689-maximum-sum-of-3-non-overlapping-subarrays
0729-my-calendar-i
0731-my-calendar-ii
0787-sliding-puzzle
0859-design-circular-deque
0870-magic-squares-in-grid
0906-walking-robot-simulation
0921-spiral-matrix-iii
0999-regions-cut-by-slashes
1002-maximum-width-ramp
1025-minimum-cost-for-tickets
1147-flip-columns-for-maximum-number-of-equal-rows
1196-filling-bookcase-shelves
1240-stone-game-ii
1256-rank-transform-of-an-array
1325-path-with-maximum-probability
1364-tuple-with-same-product
1396-count-servers-that-communicate
1402-count-square-submatrices-with-all-ones
1435-xor-queries-of-a-subarray
1468-check-if-n-and-its-double-exist
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1497-design-a-stack-with-increment-operation
1511-count-number-of-teams
1524-string-matching-in-an-array
1556-make-two-arrays-equal-by-reversing-subarrays
1570-final-prices-with-a-special-discount-in-a-shop
1620-check-if-array-pairs-are-divisible-by-k
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1691-minimum-number-of-days-to-disconnect-island
1694-make-sum-divisible-by-p
1755-defuse-the-bomb
1766-minimum-number-of-removals-to-make-mountain-array
1786-count-the-number-of-consistent-strings
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
2006-find-the-student-that-will-replace-the-chalk
2035-count-sub-islands
2054-the-number-of-the-smallest-unoccupied-chair
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2163-kth-distinct-string-in-an-array
2164-two-best-non-overlapping-events
2170-count-number-of-maximum-bitwise-or-subsets
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2343-count-unguarded-cells-in-the-grid
2375-minimum-obstacle-removal-to-reach-corner
2411-spiral-matrix-iv
2448-count-number-of-bad-pairs
2488-divide-intervals-into-minimum-number-of-groups
2494-sum-of-prefix-scores-of-strings
2503-longest-subarray-with-maximum-bitwise-and
2533-bitwise-xor-of-all-pairings
2545-height-of-binary-tree-after-subtree-removal-queries
2552-maximum-sum-of-distinct-subarrays-with-length-k
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2616-maximal-score-after-applying-k-operations
2640-maximum-number-of-integers-to-choose-from-a-range-i
2685-first-completely-painted-row-or-column
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
2711-minimum-time-to-visit-a-cell-in-a-grid
2716-prime-subtraction-operation
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
2764-maximum-number-of-fish-in-a-grid
2792-neighboring-bitwise-xor
2794-maximum-number-of-moves-in-a-grid
2868-continuous-subarrays
3235-minimum-cost-to-convert-string-i
3291-find-if-array-can-be-sorted
3309-count-prefix-and-suffix-pairs-i
3329-find-the-length-of-the-longest-common-prefix
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3380-shortest-subarray-with-or-at-least-k-ii
3427-special-array-ii
3434-find-the-number-of-distinct-colors-among-the-balls
3501-delete-nodes-from-linked-list-present-in-array
3507-find-the-count-of-numbers-which-are-not-special
3515-find-if-digit-game-can-be-won
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

String

0049-group-anagrams
0179-largest-number
0214-shortest-palindrome
0241-different-ways-to-add-parentheses
0273-integer-to-english-words
0387-first-unique-character-in-a-string
0539-minimum-time-difference
0564-find-the-closest-palindrome
0567-permutation-in-string
0592-fraction-addition-and-subtraction
0664-strange-printer
0692-top-k-frequent-words
0920-uncommon-words-from-two-sentences
0957-minimum-add-to-make-parentheses-valid
1197-parsing-a-boolean-expression
1302-delete-characters-to-make-fancy-string
1304-longest-happy-string
1473-find-the-longest-substring-containing-vowels-in-even-counts
1502-construct-k-palindrome-strings
1524-string-matching-in-an-array
1537-maximum-score-after-splitting-a-string
1715-split-a-string-into-the-max-number-of-unique-substrings
1756-minimum-deletions-to-make-string-balanced
1786-count-the-number-of-consistent-strings
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
2076-sum-of-digits-of-string-after-convert
2095-minimum-number-of-swaps-to-make-the-string-balanced
2163-kth-distinct-string-in-an-array
2221-check-if-a-parentheses-string-can-be-valid
2414-move-pieces-to-obtain-a-string
2494-sum-of-prefix-scores-of-strings
2580-circular-sentence
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
3174-minimum-number-of-changes-to-make-binary-string-beautiful
3195-separate-black-and-white-balls
3235-minimum-cost-to-convert-string-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
3447-clear-digits
3451-string-compression-iii
3455-minimum-length-of-string-after-operations

Breadth-First Search

0623-add-one-row-to-tree
0684-redundant-connection
0787-sliding-puzzle
0820-find-eventual-safe-states
0999-regions-cut-by-slashes
1396-count-servers-that-communicate
1484-linked-list-in-binary-tree
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1691-minimum-number-of-days-to-disconnect-island
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
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2646-kth-largest-sum-in-a-binary-tree
2711-minimum-time-to-visit-a-cell-in-a-grid
2764-maximum-number-of-fish-in-a-grid
3439-find-minimum-diameter-after-merging-two-trees
3517-shortest-distance-after-road-addition-queries-i

Binary Indexed Tree

1511-count-number-of-teams

Stack

0042-trapping-rain-water
0145-binary-tree-postorder-traversal
0776-n-ary-tree-postorder-traversal
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
1756-minimum-deletions-to-make-string-balanced
2095-minimum-number-of-swaps-to-make-the-string-balanced
2221-check-if-a-parentheses-string-can-be-valid
2800-minimum-string-length-after-removing-substrings
3447-clear-digits

Hash Table

0001-two-sum
0049-group-anagrams
0264-ugly-number-ii
0387-first-unique-character-in-a-string
0432-all-oone-data-structure
0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
0692-top-k-frequent-words
0870-magic-squares-in-grid
0906-walking-robot-simulation
0920-uncommon-words-from-two-sentences
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1147-flip-columns-for-maximum-number-of-equal-rows
1256-rank-transform-of-an-array
1364-tuple-with-same-product
1468-check-if-n-and-its-double-exist
1473-find-the-longest-substring-containing-vowels-in-even-counts
1502-construct-k-palindrome-strings
1556-make-two-arrays-equal-by-reversing-subarrays
1620-check-if-array-pairs-are-divisible-by-k
1694-make-sum-divisible-by-p
1715-split-a-string-into-the-max-number-of-unique-substrings
1786-count-the-number-of-consistent-strings
1915-check-if-one-string-swap-can-make-strings-equal
2054-the-number-of-the-smallest-unoccupied-chair
2163-kth-distinct-string-in-an-array
2434-design-a-number-container-system
2448-count-number-of-bad-pairs
2552-maximum-sum-of-distinct-subarrays-with-length-k
2581-divide-players-into-teams-of-equal-skill
2640-maximum-number-of-integers-to-choose-from-a-range-i
2685-first-completely-painted-row-or-column
2695-find-score-of-an-array-after-marking-all-elements
2755-extra-characters-in-a-string
3276-minimum-number-of-pushes-to-type-word-ii
3329-find-the-length-of-the-longest-common-prefix
3434-find-the-number-of-distinct-colors-among-the-balls
3455-minimum-length-of-string-after-operations
3501-delete-nodes-from-linked-list-present-in-array

Sorting

0049-group-anagrams
0179-largest-number
0539-minimum-time-difference
0632-smallest-range-covering-elements-from-k-lists
0692-top-k-frequent-words
1256-rank-transform-of-an-array
1468-check-if-n-and-its-double-exist
1556-make-two-arrays-equal-by-reversing-subarrays
2164-two-best-non-overlapping-events
2179-most-beautiful-item-for-each-query
2488-divide-intervals-into-minimum-number-of-groups
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2640-maximum-number-of-integers-to-choose-from-a-range-i
2646-kth-largest-sum-in-a-binary-tree
2695-find-score-of-an-array-after-marking-all-elements
2699-count-the-number-of-fair-pairs
3276-minimum-number-of-pushes-to-type-word-ii
3291-find-if-array-can-be-sorted

Math

0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0273-integer-to-english-words
0539-minimum-time-difference
0564-find-the-closest-palindrome
0592-fraction-addition-and-subtraction
0650-2-keys-keyboard
0870-magic-squares-in-grid
1240-stone-game-ii
1951-find-the-winner-of-the-circular-game
2155-find-missing-observations
2448-count-number-of-bad-pairs
2716-prime-subtraction-operation
2903-insert-greatest-common-divisors-in-linked-list
3507-find-the-count-of-numbers-which-are-not-special
3515-find-if-digit-game-can-be-won
3555-final-array-state-after-k-multiplication-operations-i

Number Theory

2716-prime-subtraction-operation
2903-insert-greatest-common-divisors-in-linked-list
3507-find-the-count-of-numbers-which-are-not-special

Counting

0387-first-unique-character-in-a-string
0692-top-k-frequent-words
0920-uncommon-words-from-two-sentences
1364-tuple-with-same-product
1396-count-servers-that-communicate
1502-construct-k-palindrome-strings
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
2448-count-number-of-bad-pairs
2494-sum-of-prefix-scores-of-strings
3276-minimum-number-of-pushes-to-type-word-ii
3455-minimum-length-of-string-after-operations

Greedy

0179-largest-number
0632-smallest-range-covering-elements-from-k-lists
0957-minimum-add-to-make-parentheses-valid
1304-longest-happy-string
1502-construct-k-palindrome-strings
1766-minimum-number-of-removals-to-make-mountain-array
1917-maximum-average-pass-ratio
2095-minimum-number-of-swaps-to-make-the-string-balanced
2221-check-if-a-parentheses-string-can-be-valid
2488-divide-intervals-into-minimum-number-of-groups
2509-minimize-xor
2616-maximal-score-after-applying-k-operations
2640-maximum-number-of-integers-to-choose-from-a-range-i
2716-prime-subtraction-operation
3195-separate-black-and-white-balls
3276-minimum-number-of-pushes-to-type-word-ii

Recursion

0241-different-ways-to-add-parentheses
0273-integer-to-english-words
1197-parsing-a-boolean-expression
1951-find-the-winner-of-the-circular-game

Matrix

0059-spiral-matrix-ii
0787-sliding-puzzle
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
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands
2132-convert-1d-array-into-2d-array
2343-count-unguarded-cells-in-the-grid
2375-minimum-obstacle-removal-to-reach-corner
2411-spiral-matrix-iv
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

Simulation

0059-spiral-matrix-ii
0592-fraction-addition-and-subtraction
0906-walking-robot-simulation
0921-spiral-matrix-iii
1951-find-the-winner-of-the-circular-game
2006-find-the-student-that-will-replace-the-chalk
2076-sum-of-digits-of-string-after-convert
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2343-count-unguarded-cells-in-the-grid
2411-spiral-matrix-iv
2692-take-gifts-from-the-richest-pile
2695-find-score-of-an-array-after-marking-all-elements
2800-minimum-string-length-after-removing-substrings
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits
3555-final-array-state-after-k-multiplication-operations-i

Depth-First Search

0145-binary-tree-postorder-traversal
0236-lowest-common-ancestor-of-a-binary-tree
0386-lexicographical-numbers
0623-add-one-row-to-tree
0684-redundant-connection
0776-n-ary-tree-postorder-traversal
0820-find-eventual-safe-states
0984-most-stones-removed-with-same-row-or-column
0988-flip-equivalent-binary-trees
0999-regions-cut-by-slashes
1396-count-servers-that-communicate
1484-linked-list-in-binary-tree
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands
2201-valid-arrangement-of-pairs
2246-maximum-employees-to-be-invited-to-a-meeting
2493-reverse-odd-levels-of-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2764-maximum-number-of-fish-in-a-grid
3439-find-minimum-diameter-after-merging-two-trees

Union Find

0684-redundant-connection
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1396-count-servers-that-communicate
2035-count-sub-islands
2764-maximum-number-of-fish-in-a-grid

Strongly Connected Component

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

Tree

0145-binary-tree-postorder-traversal
0236-lowest-common-ancestor-of-a-binary-tree
0623-add-one-row-to-tree
0776-n-ary-tree-postorder-traversal
0789-kth-largest-element-in-a-stream
0988-flip-equivalent-binary-trees
1484-linked-list-in-binary-tree
2493-reverse-odd-levels-of-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2646-kth-largest-sum-in-a-binary-tree
3439-find-minimum-diameter-after-merging-two-trees

Design

0432-all-oone-data-structure
0729-my-calendar-i
0731-my-calendar-ii
0789-kth-largest-element-in-a-stream
0859-design-circular-deque
1497-design-a-stack-with-increment-operation
2434-design-a-number-container-system

Binary Search Tree

0729-my-calendar-i
0731-my-calendar-ii
0789-kth-largest-element-in-a-stream
1468-check-if-n-and-its-double-exist
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1766-minimum-number-of-removals-to-make-mountain-array
1886-minimum-limit-of-balls-in-a-bag
2006-find-the-student-that-will-replace-the-chalk
2164-two-best-non-overlapping-events
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2640-maximum-number-of-integers-to-choose-from-a-range-i
2699-count-the-number-of-fair-pairs
2716-prime-subtraction-operation
3427-special-array-ii

Heap (Priority Queue)

0264-ugly-number-ii
0632-smallest-range-covering-elements-from-k-lists
0692-top-k-frequent-words
0789-kth-largest-element-in-a-stream
1304-longest-happy-string
1325-path-with-maximum-probability
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1917-maximum-average-pass-ratio
2054-the-number-of-the-smallest-unoccupied-chair
2164-two-best-non-overlapping-events
2375-minimum-obstacle-removal-to-reach-corner
2434-design-a-number-container-system
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
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
3555-final-array-state-after-k-multiplication-operations-i

Binary Tree

0145-binary-tree-postorder-traversal
0236-lowest-common-ancestor-of-a-binary-tree
0623-add-one-row-to-tree
0789-kth-largest-element-in-a-stream
0988-flip-equivalent-binary-trees
1484-linked-list-in-binary-tree
2493-reverse-odd-levels-of-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2646-kth-largest-sum-in-a-binary-tree

Data Stream

0789-kth-largest-element-in-a-stream

Backtracking

0040-combination-sum-ii
0216-combination-sum-iii
0494-target-sum
1715-split-a-string-into-the-max-number-of-unique-substrings
2170-count-number-of-maximum-bitwise-or-subsets

Prefix Sum

0731-my-calendar-ii
1240-stone-game-ii
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1537-maximum-score-after-splitting-a-string
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
2488-divide-intervals-into-minimum-number-of-groups
2691-count-vowel-strings-in-ranges
3427-special-array-ii

Game Theory

1240-stone-game-ii

Bit Manipulation

0476-number-complement
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
2170-count-number-of-maximum-bitwise-or-subsets
2323-minimum-bit-flips-to-convert-number
2503-longest-subarray-with-maximum-bitwise-and
2509-minimize-xor
2533-bitwise-xor-of-all-pairings
2792-neighboring-bitwise-xor
3291-find-if-array-can-be-sorted
3380-shortest-subarray-with-or-at-least-k-ii
3394-minimum-array-end

Linked List

0432-all-oone-data-structure
0725-split-linked-list-in-parts
0859-design-circular-deque
1484-linked-list-in-binary-tree
2411-spiral-matrix-iv
2903-insert-greatest-common-divisors-in-linked-list
3501-delete-nodes-from-linked-list-present-in-array

Brainteaser

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

Memoization

0241-different-ways-to-add-parentheses

Rolling Hash

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

String Matching

0214-shortest-palindrome
1524-string-matching-in-an-array
3309-count-prefix-and-suffix-pairs-i

Hash Function

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

Trie

0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
0692-top-k-frequent-words
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

Segment Tree

0729-my-calendar-i
0731-my-calendar-ii

Ordered Set

0729-my-calendar-i
0731-my-calendar-ii
2434-design-a-number-container-system
2868-continuous-subarrays

Queue

0387-first-unique-character-in-a-string
0859-design-circular-deque
1951-find-the-winner-of-the-circular-game
2868-continuous-subarrays

Doubly-Linked List

0432-all-oone-data-structure

Two Pointers

0042-trapping-rain-water
0567-permutation-in-string
1468-check-if-n-and-its-double-exist
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1923-sentence-similarity-iii
2095-minimum-number-of-swaps-to-make-the-string-balanced
2414-move-pieces-to-obtain-a-string
2488-divide-intervals-into-minimum-number-of-groups
2581-divide-players-into-teams-of-equal-skill
2699-count-the-number-of-fair-pairs
3018-make-string-a-subsequence-using-cyclic-increments
3195-separate-black-and-white-balls

Sliding Window

0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
1755-defuse-the-bomb
2552-maximum-sum-of-distinct-subarrays-with-length-k
2868-continuous-subarrays
3380-shortest-subarray-with-or-at-least-k-ii
3522-find-the-power-of-k-size-subarrays-i

Monotonic Stack

0042-trapping-rain-water
1002-maximum-width-ramp
1570-final-prices-with-a-special-discount-in-a-shop
1679-shortest-subarray-to-be-removed-to-make-array-sorted

Enumeration

2170-count-number-of-maximum-bitwise-or-subsets

Bucket Sort

0692-top-k-frequent-words

Eulerian Circuit

2201-valid-arrangement-of-pairs

Monotonic Queue

2868-continuous-subarrays

Topological Sort

0820-find-eventual-safe-states
2246-maximum-employees-to-be-invited-to-a-meeting