Sharing all the Questions i've solve on Leetcode

Structure of the Repository

The repository is organized as follows:

• Daily Progress: Logs of daily activities, tasks completed.
• Code Snippets: Solutions to coding problems, algorithm implementations, and other relevant code, with comments and explanations of my approaches.

Connect with Me

• Twitter: TwitterHandle
• LinkedIn: LinkedIn Profile
• Email: Email
• Portfolio: PortfolioWebsite

Let’s crack this challenge together! 💪🔥

LeetCode Topics

Linked List

0019-remove-nth-node-from-end-of-list
0023-merge-k-sorted-lists
0082-remove-duplicates-from-sorted-list-ii
0083-remove-duplicates-from-sorted-list
0086-partition-list
0143-reorder-list
0146-lru-cache
0148-sort-list
0432-all-oone-data-structure
0859-design-circular-deque
1484-linked-list-in-binary-tree
2411-spiral-matrix-iv
3501-delete-nodes-from-linked-list-present-in-array

Two Pointers

0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0042-trapping-rain-water
0080-remove-duplicates-from-sorted-array-ii
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0143-reorder-list
0148-sort-list
0151-reverse-words-in-a-string
0541-reverse-string-ii
0567-permutation-in-string
0719-find-k-th-smallest-pair-distance
0959-3sum-with-multiplicity
1028-interval-list-intersections
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

Divide and Conquer

0023-merge-k-sorted-lists
0108-convert-sorted-array-to-binary-search-tree
0148-sort-list
0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
0493-reverse-pairs
0948-sort-an-array

Sorting

0148-sort-list
0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
0378-kth-smallest-element-in-a-sorted-matrix
0435-non-overlapping-intervals
0462-minimum-moves-to-equal-array-elements-ii
0539-minimum-time-difference
0621-task-scheduler
0632-smallest-range-covering-elements-from-k-lists
0719-find-k-th-smallest-pair-distance
0778-reorganize-string
0887-minimum-cost-to-hire-k-workers
0948-sort-an-array
0959-3sum-with-multiplicity
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
1770-minimum-deletions-to-make-character-frequencies-unique
2488-divide-intervals-into-minimum-number-of-groups
2581-divide-players-into-teams-of-equal-skill
3276-minimum-number-of-pushes-to-type-word-ii

Merge Sort

0023-merge-k-sorted-lists
0148-sort-list
0493-reverse-pairs
0948-sort-an-array

Heap (Priority Queue)

0023-merge-k-sorted-lists
0215-kth-largest-element-in-an-array
0239-sliding-window-maximum
0264-ugly-number-ii
0347-top-k-frequent-elements
0378-kth-smallest-element-in-a-sorted-matrix
0621-task-scheduler
0632-smallest-range-covering-elements-from-k-lists
0778-reorganize-string
0789-kth-largest-element-in-a-stream
0887-minimum-cost-to-hire-k-workers
0948-sort-an-array
1325-path-with-maximum-probability
1622-max-value-of-equation
1762-furthest-building-you-can-reach
2488-divide-intervals-into-minimum-number-of-groups
2803-modify-graph-edge-weights

Stack

0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0143-reorder-list
0145-binary-tree-postorder-traversal
0150-evaluate-reverse-polish-notation
0173-binary-search-tree-iterator
0341-flatten-nested-list-iterator
0394-decode-string
0739-daily-temperatures
0776-n-ary-tree-postorder-traversal
0937-online-stock-span
0943-sum-of-subarray-minimums
0957-minimum-add-to-make-parentheses-valid
1002-maximum-width-ramp
1320-remove-all-adjacent-duplicates-in-string-ii
1497-design-a-stack-with-increment-operation
1666-make-the-string-great
1756-minimum-deletions-to-make-string-balanced
1792-find-the-most-competitive-subsequence
2095-minimum-number-of-swaps-to-make-the-string-balanced
2800-minimum-string-length-after-removing-substrings

Recursion

0143-reorder-list
0241-different-ways-to-add-parentheses
0273-integer-to-english-words
0394-decode-string
1013-fibonacci-number

Array

0026-remove-duplicates-from-sorted-array
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0041-first-missing-positive
0042-trapping-rain-water
0046-permutations
0048-rotate-image
0051-n-queens
0059-spiral-matrix-ii
0064-minimum-path-sum
0068-text-justification
0078-subsets
0080-remove-duplicates-from-sorted-array-ii
0084-largest-rectangle-in-histogram
0090-subsets-ii
0108-convert-sorted-array-to-binary-search-tree
0134-gas-station
0150-evaluate-reverse-polish-notation
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0209-minimum-size-subarray-sum
0212-word-search-ii
0215-kth-largest-element-in-an-array
0219-contains-duplicate-ii
0239-sliding-window-maximum
0289-game-of-life
0300-longest-increasing-subsequence
0303-range-sum-query-immutable
0307-range-sum-query-mutable
0322-coin-change
0347-top-k-frequent-elements
0378-kth-smallest-element-in-a-sorted-matrix
0381-insert-delete-getrandom-o1-duplicates-allowed
0410-split-array-largest-sum
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0462-minimum-moves-to-equal-array-elements-ii
0474-ones-and-zeroes
0493-reverse-pairs
0494-target-sum
0526-beautiful-arrangement
0539-minimum-time-difference
0587-erect-the-fence
0621-task-scheduler
0624-maximum-distance-in-arrays
0632-smallest-range-covering-elements-from-k-lists
0698-partition-to-k-equal-sum-subsets
0713-subarray-product-less-than-k
0718-maximum-length-of-repeated-subarray
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0739-daily-temperatures
0859-design-circular-deque
0870-magic-squares-in-grid
0887-minimum-cost-to-hire-k-workers
0890-lemonade-change
0906-walking-robot-simulation
0921-spiral-matrix-iii
0943-sum-of-subarray-minimums
0948-sort-an-array
0959-3sum-with-multiplicity
0966-binary-subarrays-with-sum
0971-shortest-bridge
0999-regions-cut-by-slashes
1002-maximum-width-ramp
1022-unique-paths-iii
1028-interval-list-intersections
1036-rotting-oranges
1196-filling-bookcase-shelves
1256-rank-transform-of-an-array
1325-path-with-maximum-probability
1333-sort-the-jumbled-numbers
1402-count-square-submatrices-with-all-ones
1435-xor-queries-of-a-subarray
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
1622-max-value-of-equation
1691-minimum-number-of-days-to-disconnect-island
1694-make-sum-divisible-by-p
1700-minimum-time-to-make-rope-colorful
1762-furthest-building-you-can-reach
1781-check-if-two-string-arrays-are-equivalent
1786-count-the-number-of-consistent-strings
1792-find-the-most-competitive-subsequence
1813-maximum-erasure-value
1866-restore-the-array-from-adjacent-pairs
1923-sentence-similarity-iii
2006-find-the-student-that-will-replace-the-chalk
2035-count-sub-islands
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
2255-minimum-swaps-to-group-all-1s-together-ii
2411-spiral-matrix-iv
2488-divide-intervals-into-minimum-number-of-groups
2494-sum-of-prefix-scores-of-strings
2503-longest-subarray-with-maximum-bitwise-and
2581-divide-players-into-teams-of-equal-skill
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
3329-find-the-length-of-the-longest-common-prefix
3501-delete-nodes-from-linked-list-present-in-array

Monotonic Stack

0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0739-daily-temperatures
0937-online-stock-span
0943-sum-of-subarray-minimums
1002-maximum-width-ramp
1792-find-the-most-competitive-subsequence

Breadth-First Search

0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0112-path-sum
0199-binary-tree-right-side-view
0322-coin-change
0404-sum-of-left-leaves
0530-minimum-absolute-difference-in-bst
0547-number-of-provinces
0617-merge-two-binary-trees
0662-maximum-width-of-binary-tree
0893-all-nodes-distance-k-in-binary-tree
0971-shortest-bridge
0999-regions-cut-by-slashes
1036-rotting-oranges
1442-number-of-operations-to-make-network-connected
1484-linked-list-in-binary-tree
1492-time-needed-to-inform-all-employees
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands
2171-second-minimum-time-to-reach-destination

Matrix

0037-sudoku-solver
0048-rotate-image
0059-spiral-matrix-ii
0064-minimum-path-sum
0212-word-search-ii
0289-game-of-life
0378-kth-smallest-element-in-a-sorted-matrix
0870-magic-squares-in-grid
0921-spiral-matrix-iii
0971-shortest-bridge
0999-regions-cut-by-slashes
1022-unique-paths-iii
1036-rotting-oranges
1402-count-square-submatrices-with-all-ones
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands
2132-convert-1d-array-into-2d-array
2411-spiral-matrix-iv

Hash Table

0003-longest-substring-without-repeating-characters
0037-sudoku-solver
0041-first-missing-positive
0076-minimum-window-substring
0146-lru-cache
0208-implement-trie-prefix-tree
0219-contains-duplicate-ii
0264-ugly-number-ii
0347-top-k-frequent-elements
0381-insert-delete-getrandom-o1-duplicates-allowed
0424-longest-repeating-character-replacement
0432-all-oone-data-structure
0438-find-all-anagrams-in-a-string
0567-permutation-in-string
0621-task-scheduler
0632-smallest-range-covering-elements-from-k-lists
0778-reorganize-string
0870-magic-squares-in-grid
0893-all-nodes-distance-k-in-binary-tree
0906-walking-robot-simulation
0920-uncommon-words-from-two-sentences
0959-3sum-with-multiplicity
0966-binary-subarrays-with-sum
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1256-rank-transform-of-an-array
1473-find-the-longest-substring-containing-vowels-in-even-counts
1556-make-two-arrays-equal-by-reversing-subarrays
1694-make-sum-divisible-by-p
1770-minimum-deletions-to-make-character-frequencies-unique
1786-count-the-number-of-consistent-strings
1813-maximum-erasure-value
1866-restore-the-array-from-adjacent-pairs
1960-check-if-the-sentence-is-pangram
2163-kth-distinct-string-in-an-array
2581-divide-players-into-teams-of-equal-skill
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

Design

0146-lru-cache
0173-binary-search-tree-iterator
0208-implement-trie-prefix-tree
0303-range-sum-query-immutable
0307-range-sum-query-mutable
0341-flatten-nested-list-iterator
0381-insert-delete-getrandom-o1-duplicates-allowed
0432-all-oone-data-structure
0729-my-calendar-i
0731-my-calendar-ii
0789-kth-largest-element-in-a-stream
0859-design-circular-deque
0937-online-stock-span
1497-design-a-stack-with-increment-operation

Doubly-Linked List

0146-lru-cache
0432-all-oone-data-structure

Dynamic Programming

0042-trapping-rain-water
0064-minimum-path-sum
0091-decode-ways
0095-unique-binary-search-trees-ii
0096-unique-binary-search-trees
0131-palindrome-partitioning
0152-maximum-product-subarray
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0300-longest-increasing-subsequence
0322-coin-change
0338-counting-bits
0410-split-array-largest-sum
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0474-ones-and-zeroes
0494-target-sum
0526-beautiful-arrangement
0650-2-keys-keyboard
0664-strange-printer
0698-partition-to-k-equal-sum-subsets
0718-maximum-length-of-repeated-subarray
0943-sum-of-subarray-minimums
1013-fibonacci-number
1196-filling-bookcase-shelves
1250-longest-common-subsequence
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
1700-minimum-time-to-make-rope-colorful
1756-minimum-deletions-to-make-string-balanced
2067-maximum-number-of-points-with-cost
2755-extra-characters-in-a-string

String

0003-longest-substring-without-repeating-characters
0068-text-justification
0076-minimum-window-substring
0091-decode-ways
0131-palindrome-partitioning
0151-reverse-words-in-a-string
0208-implement-trie-prefix-tree
0212-word-search-ii
0214-shortest-palindrome
0241-different-ways-to-add-parentheses
0257-binary-tree-paths
0273-integer-to-english-words
0394-decode-string
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0474-ones-and-zeroes
0539-minimum-time-difference
0541-reverse-string-ii
0564-find-the-closest-palindrome
0567-permutation-in-string
0592-fraction-addition-and-subtraction
0664-strange-printer
0778-reorganize-string
0920-uncommon-words-from-two-sentences
0957-minimum-add-to-make-parentheses-valid
1250-longest-common-subsequence
1320-remove-all-adjacent-duplicates-in-string-ii
1473-find-the-longest-substring-containing-vowels-in-even-counts
1666-make-the-string-great
1700-minimum-time-to-make-rope-colorful
1756-minimum-deletions-to-make-string-balanced
1770-minimum-deletions-to-make-character-frequencies-unique
1781-check-if-two-string-arrays-are-equivalent
1786-count-the-number-of-consistent-strings
1823-determine-if-string-halves-are-alike
1923-sentence-similarity-iii
1960-check-if-the-sentence-is-pangram
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
2494-sum-of-prefix-scores-of-strings
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
2800-minimum-string-length-after-removing-substrings
3275-minimum-number-of-pushes-to-type-word-i
3276-minimum-number-of-pushes-to-type-word-ii
3329-find-the-length-of-the-longest-common-prefix

Bucket Sort

0347-top-k-frequent-elements
0948-sort-an-array

Radix Sort

0948-sort-an-array

Counting Sort

0347-top-k-frequent-elements
0621-task-scheduler
0778-reorganize-string
0920-uncommon-words-from-two-sentences
0948-sort-an-array
0959-3sum-with-multiplicity
1786-count-the-number-of-consistent-strings
1823-determine-if-string-halves-are-alike
2163-kth-distinct-string-in-an-array
2494-sum-of-prefix-scores-of-strings
3276-minimum-number-of-pushes-to-type-word-ii

Tree

0095-unique-binary-search-trees-ii
0096-unique-binary-search-trees
0098-validate-binary-search-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0108-convert-sorted-array-to-binary-search-tree
0110-balanced-binary-tree
0112-path-sum
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0341-flatten-nested-list-iterator
0404-sum-of-left-leaves
0530-minimum-absolute-difference-in-bst
0572-subtree-of-another-tree
0617-merge-two-binary-trees
0662-maximum-width-of-binary-tree
0776-n-ary-tree-postorder-traversal
0789-kth-largest-element-in-a-stream
0893-all-nodes-distance-k-in-binary-tree
0975-range-sum-of-bst
1484-linked-list-in-binary-tree
1492-time-needed-to-inform-all-employees

Depth-First Search

0098-validate-binary-search-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0112-path-sum
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0341-flatten-nested-list-iterator
0386-lexicographical-numbers
0404-sum-of-left-leaves
0530-minimum-absolute-difference-in-bst
0547-number-of-provinces
0572-subtree-of-another-tree
0617-merge-two-binary-trees
0662-maximum-width-of-binary-tree
0776-n-ary-tree-postorder-traversal
0893-all-nodes-distance-k-in-binary-tree
0971-shortest-bridge
0975-range-sum-of-bst
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1442-number-of-operations-to-make-network-connected
1484-linked-list-in-binary-tree
1492-time-needed-to-inform-all-employees
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands

Binary Tree

0095-unique-binary-search-trees-ii
0096-unique-binary-search-trees
0098-validate-binary-search-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0108-convert-sorted-array-to-binary-search-tree
0110-balanced-binary-tree
0112-path-sum
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0404-sum-of-left-leaves
0530-minimum-absolute-difference-in-bst
0572-subtree-of-another-tree
0617-merge-two-binary-trees
0662-maximum-width-of-binary-tree
0789-kth-largest-element-in-a-stream
0893-all-nodes-distance-k-in-binary-tree
0975-range-sum-of-bst
1484-linked-list-in-binary-tree

Binary Search Tree

0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0095-unique-binary-search-trees-ii
0096-unique-binary-search-trees
0098-validate-binary-search-tree
0108-convert-sorted-array-to-binary-search-tree
0153-find-minimum-in-rotated-sorted-array
0173-binary-search-tree-iterator
0209-minimum-size-subarray-sum
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0300-longest-increasing-subsequence
0378-kth-smallest-element-in-a-sorted-matrix
0410-split-array-largest-sum
0493-reverse-pairs
0530-minimum-absolute-difference-in-bst
0718-maximum-length-of-repeated-subarray
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0789-kth-largest-element-in-a-stream
0975-range-sum-of-bst
1615-range-sum-of-sorted-subarray-sums
2006-find-the-student-that-will-replace-the-chalk

Backtracking

0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0046-permutations
0051-n-queens
0077-combinations
0078-subsets
0090-subsets-ii
0095-unique-binary-search-trees-ii
0131-palindrome-partitioning
0212-word-search-ii
0257-binary-tree-paths
0494-target-sum
0526-beautiful-arrangement
0698-partition-to-k-equal-sum-subsets
1022-unique-paths-iii

String Matching

0214-shortest-palindrome
0572-subtree-of-another-tree

Hash Function

0214-shortest-palindrome
0572-subtree-of-another-tree
0718-maximum-length-of-repeated-subarray

Graph

0547-number-of-provinces
0984-most-stones-removed-with-same-row-or-column
1325-path-with-maximum-probability
1442-number-of-operations-to-make-network-connected
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

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

Bit Manipulation

0078-subsets
0090-subsets-ii
0338-counting-bits
0476-number-complement
0526-beautiful-arrangement
0698-partition-to-k-equal-sum-subsets
1022-unique-paths-iii
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1786-count-the-number-of-consistent-strings
2323-minimum-bit-flips-to-convert-number
2503-longest-subarray-with-maximum-bitwise-and

Math

0048-rotate-image
0096-unique-binary-search-trees
0150-evaluate-reverse-polish-notation
0241-different-ways-to-add-parentheses
0258-add-digits
0263-ugly-number
0264-ugly-number-ii
0273-integer-to-english-words
0381-insert-delete-getrandom-o1-duplicates-allowed
0462-minimum-moves-to-equal-array-elements-ii
0539-minimum-time-difference
0564-find-the-closest-palindrome
0587-erect-the-fence
0592-fraction-addition-and-subtraction
0650-2-keys-keyboard
0870-magic-squares-in-grid
1013-fibonacci-number
2155-find-missing-observations
3275-minimum-number-of-pushes-to-type-word-i

Randomized

0381-insert-delete-getrandom-o1-duplicates-allowed

Sliding Window

0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
0209-minimum-size-subarray-sum
0219-contains-duplicate-ii
0239-sliding-window-maximum
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
0713-subarray-product-less-than-k
0718-maximum-length-of-repeated-subarray
0966-binary-subarrays-with-sum
1622-max-value-of-equation
1813-maximum-erasure-value
2255-minimum-swaps-to-group-all-1s-together-ii

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Binary Indexed Tree

0307-range-sum-query-mutable
0493-reverse-pairs
1511-count-number-of-teams

Greedy

0134-gas-station
0410-split-array-largest-sum
0435-non-overlapping-intervals
0621-task-scheduler
0624-maximum-distance-in-arrays
0632-smallest-range-covering-elements-from-k-lists
0778-reorganize-string
0887-minimum-cost-to-hire-k-workers
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
1700-minimum-time-to-make-rope-colorful
1762-furthest-building-you-can-reach
1770-minimum-deletions-to-make-character-frequencies-unique
1792-find-the-most-competitive-subsequence
2095-minimum-number-of-swaps-to-make-the-string-balanced
2488-divide-intervals-into-minimum-number-of-groups
3275-minimum-number-of-pushes-to-type-word-i
3276-minimum-number-of-pushes-to-type-word-ii

Queue

0239-sliding-window-maximum
0341-flatten-nested-list-iterator
0859-design-circular-deque
1622-max-value-of-equation

Monotonic Queue

0239-sliding-window-maximum
1622-max-value-of-equation

Data Stream

0789-kth-largest-element-in-a-stream
0937-online-stock-span

Iterator

0173-binary-search-tree-iterator
0341-flatten-nested-list-iterator

Database

0197-rising-temperature
0570-managers-with-at-least-5-direct-reports
0577-employee-bonus
0584-find-customer-referee
0595-big-countries
0620-not-boring-movies
1258-article-views-i
1415-students-and-examinations
1509-replace-employee-id-with-the-unique-identifier
1724-customer-who-visited-but-did-not-make-any-transactions
1801-average-time-of-process-per-machine
1827-invalid-tweets
1908-recyclable-and-low-fat-products
2087-confirmation-rate

Geometry

0587-erect-the-fence

Simulation

0059-spiral-matrix-ii
0068-text-justification
0258-add-digits
0289-game-of-life
0592-fraction-addition-and-subtraction
0906-walking-robot-simulation
0921-spiral-matrix-iii
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
2411-spiral-matrix-iv
2800-minimum-string-length-after-removing-substrings

Number Theory

0258-add-digits

Prefix Sum

0209-minimum-size-subarray-sum
0303-range-sum-query-immutable
0410-split-array-largest-sum
0731-my-calendar-ii
0966-binary-subarrays-with-sum
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1694-make-sum-divisible-by-p
2006-find-the-student-that-will-replace-the-chalk
2488-divide-intervals-into-minimum-number-of-groups

Segment Tree

0307-range-sum-query-mutable
0493-reverse-pairs
0729-my-calendar-i
0731-my-calendar-ii

Bitmask

0526-beautiful-arrangement
0698-partition-to-k-equal-sum-subsets

Union Find

0547-number-of-provinces
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1442-number-of-operations-to-make-network-connected
2035-count-sub-islands

Strongly Connected Component

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

Trie

0208-implement-trie-prefix-tree
0212-word-search-ii
0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
2494-sum-of-prefix-scores-of-strings
2755-extra-characters-in-a-string
3329-find-the-length-of-the-longest-common-prefix

Ordered Set

0493-reverse-pairs
0729-my-calendar-i
0731-my-calendar-ii

Memoization

0241-different-ways-to-add-parentheses
0698-partition-to-k-equal-sum-subsets
1013-fibonacci-number

Rolling Hash

0214-shortest-palindrome
0718-maximum-length-of-repeated-subarray

Brainteaser

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