LeetCode-Solutions

Easy Solutions of some of the best programs available on LeetCode for Beginners and Intermediate , uploaded on languages namely Python , Java , C++, C .

Two Pointers

0075-sort-colors
0344-reverse-string
0633-sum-of-square-numbers
0853-most-profit-assigning-work
2572-append-characters-to-string-to-make-subsequence

String

0344-reverse-string
0409-longest-palindrome
0648-replace-words
1044-find-common-characters
2572-append-characters-to-string-to-make-subsequence

Greedy

0330-patching-array
0409-longest-palindrome
0502-ipo
0853-most-profit-assigning-work
0876-hand-of-straights
0982-minimum-increment-to-make-array-unique
1285-balance-a-binary-search-tree
2148-minimum-number-of-moves-to-seat-everyone
2379-maximum-total-importance-of-roads
2572-append-characters-to-string-to-make-subsequence

Database

1245-user-activity-for-the-past-30-days-i
2495-number-of-unique-subjects-taught-by-each-teacher

Hash Table

0409-longest-palindrome
0523-continuous-subarray-sum
0648-replace-words
0876-hand-of-straights
1016-subarray-sums-divisible-by-k
1044-find-common-characters
1217-relative-sort-array
1370-count-number-of-nice-subarrays

Array

0075-sort-colors
0330-patching-array
0502-ipo
0523-continuous-subarray-sum
0648-replace-words
0853-most-profit-assigning-work
0876-hand-of-straights
0982-minimum-increment-to-make-array-unique
1016-subarray-sums-divisible-by-k
1037-minimum-number-of-k-consecutive-bit-flips
1044-find-common-characters
1137-height-checker
1138-grumpy-bookstore-owner
1217-relative-sort-array
1370-count-number-of-nice-subarrays
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1605-minimum-number-of-days-to-make-m-bouquets
1675-magnetic-force-between-two-balls
2148-minimum-number-of-moves-to-seat-everyone

Sorting

0075-sort-colors
0502-ipo
0853-most-profit-assigning-work
0876-hand-of-straights
0982-minimum-increment-to-make-array-unique
1137-height-checker
1217-relative-sort-array
1675-magnetic-force-between-two-balls
2148-minimum-number-of-moves-to-seat-everyone
2379-maximum-total-importance-of-roads

Trie

0648-replace-words

Math

0523-continuous-subarray-sum
0633-sum-of-square-numbers
1370-count-number-of-nice-subarrays

Prefix Sum

0523-continuous-subarray-sum
1016-subarray-sums-divisible-by-k
1037-minimum-number-of-k-consecutive-bit-flips

Counting Sort

0982-minimum-increment-to-make-array-unique
1137-height-checker
1217-relative-sort-array

Heap (Priority Queue)

0502-ipo
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2379-maximum-total-importance-of-roads

Binary Search

0633-sum-of-square-numbers
0853-most-profit-assigning-work
1605-minimum-number-of-days-to-make-m-bouquets
1675-magnetic-force-between-two-balls

Sliding Window

1037-minimum-number-of-k-consecutive-bit-flips
1138-grumpy-bookstore-owner
1370-count-number-of-nice-subarrays
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Queue

1037-minimum-number-of-k-consecutive-bit-flips
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Ordered Set

1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Monotonic Queue

1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Bit Manipulation

1037-minimum-number-of-k-consecutive-bit-flips

Tree

1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Depth-First Search

1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Binary Search Tree

1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Binary Tree

1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Divide and Conquer

1285-balance-a-binary-search-tree

Graph

1916-find-center-of-star-graph
2379-maximum-total-importance-of-roads

LeetCode Topics

Depth-First Search

0145-binary-tree-postorder-traversal
0386-lexicographical-numbers
0776-n-ary-tree-postorder-traversal
0984-most-stones-removed-with-same-row-or-column
0988-flip-equivalent-binary-trees
0999-regions-cut-by-slashes
1207-delete-nodes-and-return-forest
1350-remove-sub-folders-from-the-filesystem
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1484-linked-list-in-binary-tree
1653-number-of-good-leaf-nodes-pairs
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2545-height-of-binary-tree-after-subtree-removal-queries
2677-cousins-in-binary-tree-ii

Breadth-First Search

0102-binary-tree-level-order-traversal
0999-regions-cut-by-slashes
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1484-linked-list-in-binary-tree
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands
2171-second-minimum-time-to-reach-destination
2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Graph

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
1701-remove-max-number-of-edges-to-keep-graph-fully-traversable
2171-second-minimum-time-to-reach-destination
2472-build-a-matrix-with-conditions
2803-modify-graph-edge-weights
3235-minimum-cost-to-convert-string-i

Topological Sort

1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
2472-build-a-matrix-with-conditions

Union Find

0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1701-remove-max-number-of-edges-to-keep-graph-fully-traversable
2035-count-sub-islands

Array

0033-search-in-rotated-sorted-array
0040-combination-sum-ii
0179-largest-number
0350-intersection-of-two-arrays-ii
0539-minimum-time-difference
0624-maximum-distance-in-arrays
0632-smallest-range-covering-elements-from-k-lists
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0859-design-circular-deque
0870-magic-squares-in-grid
0890-lemonade-change
0906-walking-robot-simulation
0921-spiral-matrix-iii
0948-sort-an-array
0999-regions-cut-by-slashes
1002-maximum-width-ramp
1196-filling-bookcase-shelves
1207-delete-nodes-and-return-forest
1240-stone-game-ii
1256-rank-transform-of-an-array
1293-three-consecutive-odds
1325-path-with-maximum-probability
1333-sort-the-jumbled-numbers
1350-remove-sub-folders-from-the-filesystem
1402-count-square-submatrices-with-all-ones
1435-xor-queries-of-a-subarray
1496-lucky-numbers-in-a-matrix
1497-design-a-stack-with-increment-operation
1511-count-number-of-teams
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
1620-check-if-array-pairs-are-divisible-by-k
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
1766-minimum-number-of-removals-to-make-mountain-array
1786-count-the-number-of-consistent-strings
1803-average-waiting-time
1923-sentence-similarity-iii
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
2067-maximum-number-of-points-with-cost
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2163-kth-distinct-string-in-an-array
2170-count-number-of-maximum-bitwise-or-subsets
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2255-minimum-swaps-to-group-all-1s-together-ii
2306-create-binary-tree-from-descriptions
2356-largest-combination-with-bitwise-and-greater-than-zero
2411-spiral-matrix-iv
2472-build-a-matrix-with-conditions
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
2545-height-of-binary-tree-after-subtree-removal-queries
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2616-maximal-score-after-applying-k-operations
2699-count-the-number-of-fair-pairs
2716-prime-subtraction-operation
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
2794-maximum-number-of-moves-in-a-grid
2846-robot-collisions
3235-minimum-cost-to-convert-string-i
3291-find-if-array-can-be-sorted
3329-find-the-length-of-the-longest-common-prefix
3380-shortest-subarray-with-or-at-least-k-ii
3501-delete-nodes-from-linked-list-present-in-array

Hash Table

0264-ugly-number-ii
0350-intersection-of-two-arrays-ii
0432-all-oone-data-structure
0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
0726-number-of-atoms
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
1207-delete-nodes-and-return-forest
1256-rank-transform-of-an-array
1473-find-the-longest-substring-containing-vowels-in-even-counts
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
1741-sort-array-by-increasing-frequency
1786-count-the-number-of-consistent-strings
2054-the-number-of-the-smallest-unoccupied-chair
2163-kth-distinct-string-in-an-array
2306-create-binary-tree-from-descriptions
2356-largest-combination-with-bitwise-and-greater-than-zero
2502-sort-the-people
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2677-cousins-in-binary-tree-ii
2755-extra-characters-in-a-string
3276-minimum-number-of-pushes-to-type-word-ii
3329-find-the-length-of-the-longest-common-prefix
3501-delete-nodes-from-linked-list-present-in-array

Two Pointers

0350-intersection-of-two-arrays-ii
0567-permutation-in-string
0719-find-k-th-smallest-pair-distance
1615-range-sum-of-sorted-subarray-sums
1923-sentence-similarity-iii
2095-minimum-number-of-swaps-to-make-the-string-balanced
2488-divide-intervals-into-minimum-number-of-groups
2581-divide-players-into-teams-of-equal-skill
2699-count-the-number-of-fair-pairs
3195-separate-black-and-white-balls

Binary Search

0033-search-in-rotated-sorted-array
0350-intersection-of-two-arrays-ii
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
1615-range-sum-of-sorted-subarray-sums
1766-minimum-number-of-removals-to-make-mountain-array
2006-find-the-student-that-will-replace-the-chalk
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2586-longest-square-streak-in-an-array
2699-count-the-number-of-fair-pairs
2716-prime-subtraction-operation

Sorting

0179-largest-number
0350-intersection-of-two-arrays-ii
0539-minimum-time-difference
0632-smallest-range-covering-elements-from-k-lists
0719-find-k-th-smallest-pair-distance
0726-number-of-atoms
0948-sort-an-array
1256-rank-transform-of-an-array
1333-sort-the-jumbled-numbers
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
1741-sort-array-by-increasing-frequency
2179-most-beautiful-item-for-each-query
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
2646-kth-largest-sum-in-a-binary-tree
2699-count-the-number-of-fair-pairs
2846-robot-collisions
3276-minimum-number-of-pushes-to-type-word-ii
3291-find-if-array-can-be-sorted

Greedy

0179-largest-number
0624-maximum-distance-in-arrays
0632-smallest-range-covering-elements-from-k-lists
0670-maximum-swap
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
1304-longest-happy-string
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
2095-minimum-number-of-swaps-to-make-the-string-balanced
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
2716-prime-subtraction-operation
3195-separate-black-and-white-balls
3276-minimum-number-of-pushes-to-type-word-ii

Database

0196-delete-duplicate-emails
0610-triangle-judgement
0619-biggest-single-number
0626-exchange-seats
1811-fix-names-in-a-table
1877-find-followers-count
1882-the-number-of-employees-which-report-to-each-employee
1942-primary-department-for-each-employee
2127-employees-whose-manager-left-the-company

Linked List

0432-all-oone-data-structure
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
2076-sum-of-digits-of-string-after-convert
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2299-merge-nodes-in-between-zeros
2411-spiral-matrix-iv
2645-pass-the-pillow
2800-minimum-string-length-after-removing-substrings
2846-robot-collisions

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
0670-maximum-swap
0870-magic-squares-in-grid
1240-stone-game-ii
1642-water-bottles
1951-find-the-winner-of-the-circular-game
2155-find-missing-observations
2645-pass-the-pillow
2716-prime-subtraction-operation
2903-insert-greatest-common-divisors-in-linked-list

Recursion

0241-different-ways-to-add-parentheses
0273-integer-to-english-words
1197-parsing-a-boolean-expression
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game

Queue

0859-design-circular-deque
1951-find-the-winner-of-the-circular-game

String

0179-largest-number
0214-shortest-palindrome
0241-different-ways-to-add-parentheses
0273-integer-to-english-words
0539-minimum-time-difference
0564-find-the-closest-palindrome
0567-permutation-in-string
0592-fraction-addition-and-subtraction
0664-strange-printer
0726-number-of-atoms
0812-rotate-string
0920-uncommon-words-from-two-sentences
0957-minimum-add-to-make-parentheses-valid
1197-parsing-a-boolean-expression
1298-reverse-substrings-between-each-pair-of-parentheses
1302-delete-characters-to-make-fancy-string
1304-longest-happy-string
1350-remove-sub-folders-from-the-filesystem
1473-find-the-longest-substring-containing-vowels-in-even-counts
1667-find-kth-bit-in-nth-binary-string
1715-split-a-string-into-the-max-number-of-unique-substrings
1720-crawler-log-folder
1756-minimum-deletions-to-make-string-balanced
1786-count-the-number-of-consistent-strings
1818-maximum-score-from-removing-substrings
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
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2494-sum-of-prefix-scores-of-strings
2502-sort-the-people
2580-circular-sentence
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
2800-minimum-string-length-after-removing-substrings
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
3329-find-the-length-of-the-longest-common-prefix
3451-string-compression-iii

Stack

0145-binary-tree-postorder-traversal
0726-number-of-atoms
0776-n-ary-tree-postorder-traversal
0957-minimum-add-to-make-parentheses-valid
1002-maximum-width-ramp
1197-parsing-a-boolean-expression
1298-reverse-substrings-between-each-pair-of-parentheses
1497-design-a-stack-with-increment-operation
1720-crawler-log-folder
1756-minimum-deletions-to-make-string-balanced
1818-maximum-score-from-removing-substrings
2095-minimum-number-of-swaps-to-make-the-string-balanced
2800-minimum-string-length-after-removing-substrings
2846-robot-collisions

Tree

0102-binary-tree-level-order-traversal
0145-binary-tree-postorder-traversal
0776-n-ary-tree-postorder-traversal
0789-kth-largest-element-in-a-stream
0988-flip-equivalent-binary-trees
1207-delete-nodes-and-return-forest
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
2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Binary Tree

0102-binary-tree-level-order-traversal
0145-binary-tree-postorder-traversal
0789-kth-largest-element-in-a-stream
0988-flip-equivalent-binary-trees
1207-delete-nodes-and-return-forest
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
2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Matrix

0870-magic-squares-in-grid
0921-spiral-matrix-iii
0999-regions-cut-by-slashes
1402-count-square-submatrices-with-all-ones
1496-lucky-numbers-in-a-matrix
1691-minimum-number-of-days-to-disconnect-island
1711-find-valid-matrix-given-row-and-column-sums
2035-count-sub-islands
2132-convert-1d-array-into-2d-array
2411-spiral-matrix-iv
2472-build-a-matrix-with-conditions
2794-maximum-number-of-moves-in-a-grid

Divide and Conquer

0948-sort-an-array

Heap (Priority Queue)

0264-ugly-number-ii
0632-smallest-range-covering-elements-from-k-lists
0789-kth-largest-element-in-a-stream
0948-sort-an-array
1304-longest-happy-string
1325-path-with-maximum-probability
2054-the-number-of-the-smallest-unoccupied-chair
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
2803-modify-graph-edge-weights

Merge Sort

0948-sort-an-array

Bucket Sort

0948-sort-an-array

Radix Sort

0948-sort-an-array

Counting Sort

0920-uncommon-words-from-two-sentences
0948-sort-an-array
1620-check-if-array-pairs-are-divisible-by-k
1786-count-the-number-of-consistent-strings
2163-kth-distinct-string-in-an-array
2356-largest-combination-with-bitwise-and-greater-than-zero
2494-sum-of-prefix-scores-of-strings
3276-minimum-number-of-pushes-to-type-word-ii

Dynamic Programming

0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0650-2-keys-keyboard
0664-strange-printer
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
2067-maximum-number-of-points-with-cost
2554-minimum-total-distance-traveled
2586-longest-square-streak-in-an-array
2755-extra-characters-in-a-string
2794-maximum-number-of-moves-in-a-grid

Shortest Path

1325-path-with-maximum-probability
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
2171-second-minimum-time-to-reach-destination
2803-modify-graph-edge-weights
3235-minimum-cost-to-convert-string-i

Binary Indexed Tree

1511-count-number-of-teams

Sliding Window

0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
2255-minimum-swaps-to-group-all-1s-together-ii
3380-shortest-subarray-with-or-at-least-k-ii

Strongly Connected Component

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

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

Binary Search Tree

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

Data Stream

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

Backtracking

0040-combination-sum-ii
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
1694-make-sum-divisible-by-p
1940-maximum-xor-for-each-query
2006-find-the-student-that-will-replace-the-chalk
2488-divide-intervals-into-minimum-number-of-groups

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
2356-largest-combination-with-bitwise-and-greater-than-zero
2503-longest-subarray-with-maximum-bitwise-and
3291-find-if-array-can-be-sorted
3380-shortest-subarray-with-or-at-least-k-ii
3394-minimum-array-end

Number Theory

2716-prime-subtraction-operation
2903-insert-greatest-common-divisors-in-linked-list

Brainteaser

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

Memoization

0241-different-ways-to-add-parentheses

Rolling Hash

0214-shortest-palindrome

String Matching

0214-shortest-palindrome
0812-rotate-string

Hash Function

0214-shortest-palindrome

Trie

0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
1350-remove-sub-folders-from-the-filesystem
2494-sum-of-prefix-scores-of-strings
2755-extra-characters-in-a-string
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

Doubly-Linked List

0432-all-oone-data-structure

Monotonic Stack

1002-maximum-width-ramp

Enumeration

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