Leetcode-submissions

Collection of LeetCode questions to ace the coding interview! Maintaining my DSA journey here!

String

0344-reverse-string
3379-score-of-a-string

Two Pointers

0075-sort-colors
0344-reverse-string
0853-most-profit-assigning-work

Array

0075-sort-colors
0523-continuous-subarray-sum
0853-most-profit-assigning-work
0982-minimum-increment-to-make-array-unique
1016-subarray-sums-divisible-by-k
1217-relative-sort-array
1370-count-number-of-nice-subarrays
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2148-minimum-number-of-moves-to-seat-everyone

Hash Table

0523-continuous-subarray-sum
1016-subarray-sums-divisible-by-k
1217-relative-sort-array
1370-count-number-of-nice-subarrays

Math

0523-continuous-subarray-sum
1370-count-number-of-nice-subarrays

Prefix Sum

0523-continuous-subarray-sum
1016-subarray-sums-divisible-by-k

Sorting

0075-sort-colors
0853-most-profit-assigning-work
0982-minimum-increment-to-make-array-unique
1217-relative-sort-array
2148-minimum-number-of-moves-to-seat-everyone
2379-maximum-total-importance-of-roads

Counting Sort

0982-minimum-increment-to-make-array-unique
1217-relative-sort-array

Greedy

0853-most-profit-assigning-work
0982-minimum-increment-to-make-array-unique
2148-minimum-number-of-moves-to-seat-everyone
2379-maximum-total-importance-of-roads

Binary Search

0853-most-profit-assigning-work

Sliding Window

1370-count-number-of-nice-subarrays
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Queue

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

Heap (Priority Queue)

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

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

Graph

2379-maximum-total-importance-of-roads

LeetCode Topics

Array

0011-container-with-most-water
0042-trapping-rain-water
0056-merge-intervals
0073-set-matrix-zeroes
0075-sort-colors
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0128-longest-consecutive-sequence
0135-candy
0167-two-sum-ii-input-array-is-sorted
0200-number-of-islands
0238-product-of-array-except-self
0350-intersection-of-two-arrays-ii
0368-largest-divisible-subset
0416-partition-equal-subset-sum
0594-longest-harmonious-subsequence
0624-maximum-distance-in-arrays
0735-asteroid-collision
0797-rabbits-in-forest
0837-most-common-word
0890-lemonade-change
0921-spiral-matrix-iii
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0943-sum-of-subarray-minimums
1184-car-pooling
1196-filling-bookcase-shelves
1227-number-of-equivalent-domino-pairs
1293-three-consecutive-odds
1335-maximum-candies-allocated-to-k-children
1350-remove-sub-folders-from-the-filesystem
1421-find-numbers-with-even-number-of-digits
1424-maximum-candies-you-can-get-from-boxes
1478-maximum-number-of-events-that-can-be-attended
1496-lucky-numbers-in-a-matrix
1510-find-lucky-integer-in-an-array
1511-count-number-of-teams
1631-number-of-sub-arrays-with-odd-sum
1656-count-good-triplets
1691-minimum-number-of-days-to-disconnect-island
1720-crawler-log-folder
1766-minimum-number-of-removals-to-make-mountain-array
1849-maximum-absolute-sum-of-any-subarray
1993-sum-of-all-subset-xor-totals
2107-find-unique-binary-string
2138-sum-of-beauty-in-the-array
2144-maximum-difference-between-increasing-elements
2150-kth-smallest-product-of-two-sorted-arrays
2160-minimum-operations-to-make-a-uni-value-grid
2163-kth-distinct-string-in-an-array
2170-count-number-of-maximum-bitwise-or-subsets
2179-most-beautiful-item-for-each-query
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2229-maximum-fruits-harvested-after-at-most-k-steps
2237-longest-palindrome-by-concatenating-two-letter-words
2249-count-the-hidden-sequences
2255-minimum-swaps-to-group-all-1s-together-ii
2262-solving-questions-with-brainpower
2265-partition-array-according-to-given-pivot
2267-minimum-difference-in-sums-after-removal-of-elements
2277-count-equal-and-divisible-pairs-in-an-array
2280-count-good-triplets-in-an-array
2306-create-binary-tree-from-descriptions
2308-divide-array-into-equal-pairs
2316-count-hills-and-valleys-in-an-array
2387-partition-array-such-that-maximum-difference-is-k
2394-count-subarrays-with-score-less-than-k
2400-minimum-score-after-removals-on-a-tree
2478-longest-nice-subarray
2479-meeting-rooms-iii
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
2527-count-subarrays-with-fixed-bounds
2551-apply-operations-to-an-array
2588-maximum-number-of-points-from-grid-queries
2614-maximum-count-of-positive-integer-and-negative-integer
2626-count-the-number-of-good-subarrays
2665-minimum-time-to-repair-cars
2681-put-marbles-in-bags
2689-rearranging-fruits
2690-house-robber-iv
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2846-robot-collisions
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
2915-count-of-interesting-subarrays
3001-apply-operations-to-maximize-score
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
3194-find-words-containing-character
3213-count-subarrays-where-max-element-appears-at-least-k-times
3227-find-missing-and-repeated-values
3241-divide-array-into-arrays-with-max-difference
3321-type-of-triangle
3348-minimum-cost-walk-in-weighted-graph
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3621-minimum-operations-to-make-array-values-equal-to-k
3627-find-minimum-time-to-reach-last-room-i
3647-zero-array-transformation-iii
3648-find-the-maximum-number-of-fruits-collected
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
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3788-maximum-unique-subarray-sum-after-deletion
3789-maximize-subarrays-after-removing-one-conflicting-pair
3790-fruits-into-baskets-ii

Hash Table

0003-longest-substring-without-repeating-characters
0030-substring-with-concatenation-of-all-words
0073-set-matrix-zeroes
0076-minimum-window-substring
0128-longest-consecutive-sequence
0264-ugly-number-ii
0350-intersection-of-two-arrays-ii
0424-longest-repeating-character-replacement
0594-longest-harmonious-subsequence
0726-number-of-atoms
0768-partition-labels
0797-rabbits-in-forest
0837-most-common-word
0896-smallest-subtree-with-all-the-deepest-nodes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1160-letter-tile-possibilities
1218-lowest-common-ancestor-of-deepest-leaves
1227-number-of-equivalent-domino-pairs
1387-find-elements-in-a-contaminated-binary-tree
1460-number-of-substrings-containing-all-three-characters
1510-find-lucky-integer-in-an-array
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
2306-create-binary-tree-from-descriptions
2308-divide-array-into-equal-pairs
2479-meeting-rooms-iii
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2626-count-the-number-of-good-subarrays
2689-rearranging-fruits
2707-merge-two-2d-arrays-by-summing-values
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
2915-count-of-interesting-subarrays
3227-find-missing-and-repeated-values
3360-minimum-deletions-to-make-string-k-special
3445-lexicographically-minimum-string-after-removing-stars
3548-find-the-count-of-good-integers
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3621-minimum-operations-to-make-array-values-equal-to-k
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3788-maximum-unique-subarray-sum-after-deletion

Two Pointers

0011-container-with-most-water
0042-trapping-rain-water
0075-sort-colors
0167-two-sum-ii-input-array-is-sorted
0344-reverse-string
0350-intersection-of-two-arrays-ii
0392-is-subsequence
0768-partition-labels
2265-partition-array-according-to-given-pivot
2551-apply-operations-to-an-array
2588-maximum-number-of-points-from-grid-queries
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values

Binary Search

0167-two-sum-ii-input-array-is-sorted
0350-intersection-of-two-arrays-ii
1335-maximum-candies-allocated-to-k-children
1766-minimum-number-of-removals-to-make-mountain-array
2150-kth-smallest-product-of-two-sorted-arrays
2179-most-beautiful-item-for-each-query
2229-maximum-fruits-harvested-after-at-most-k-steps
2280-count-good-triplets-in-an-array
2394-count-subarrays-with-score-less-than-k
2498-smallest-subarrays-with-maximum-bitwise-or
2614-maximum-count-of-positive-integer-and-negative-integer
2665-minimum-time-to-repair-cars
2690-house-robber-iv
2699-count-the-number-of-fair-pairs
3790-fruits-into-baskets-ii

Sorting

0056-merge-intervals
0075-sort-colors
0350-intersection-of-two-arrays-ii
0368-largest-divisible-subset
0594-longest-harmonious-subsequence
0726-number-of-atoms
1184-car-pooling
1478-maximum-number-of-events-that-can-be-attended
2160-minimum-operations-to-make-a-uni-value-grid
2179-most-beautiful-item-for-each-query
2215-finding-3-digit-even-numbers
2387-partition-array-such-that-maximum-difference-is-k
2479-meeting-rooms-iii
2588-maximum-number-of-points-from-grid-queries
2681-put-marbles-in-bags
2689-rearranging-fruits
2699-count-the-number-of-fair-pairs
2846-robot-collisions
2888-minimum-index-of-a-valid-split
3001-apply-operations-to-maximize-score
3241-divide-array-into-arrays-with-max-difference
3321-type-of-triangle
3360-minimum-deletions-to-make-string-k-special
3647-zero-array-transformation-iii
3657-check-if-grid-can-be-cut-into-sections

Linked List

1411-convert-binary-number-in-a-linked-list-to-integer
2182-find-the-minimum-and-maximum-number-of-nodes-between-critical-points

String

0003-longest-substring-without-repeating-characters
0030-substring-with-concatenation-of-all-words
0038-count-and-say
0076-minimum-window-substring
0273-integer-to-english-words
0344-reverse-string
0392-is-subsequence
0424-longest-repeating-character-replacement
0726-number-of-atoms
0768-partition-labels
0837-most-common-word
1058-lexicographically-smallest-equivalent-string
1078-remove-outermost-parentheses
1160-letter-tile-possibilities
1170-shortest-common-supersequence
1350-remove-sub-folders-from-the-filesystem
1460-number-of-substrings-containing-all-three-characters
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1720-crawler-log-folder
2076-sum-of-digits-of-string-after-convert
2107-find-unique-binary-string
2163-kth-distinct-string-in-an-array
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2260-divide-a-string-into-groups-of-size-k
2395-longest-binary-subsequence-less-than-or-equal-to-k
2520-using-a-robot-to-print-the-lexicographically-smallest-string
3194-find-words-containing-character
3243-count-the-number-of-powerful-integers
3360-minimum-deletions-to-make-string-k-special
3445-lexicographically-minimum-string-after-removing-stars
3451-string-compression-iii
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3617-find-the-original-typed-string-i
3618-find-the-original-typed-string-ii
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes

Stack

0042-trapping-rain-water
0726-number-of-atoms
0735-asteroid-collision
0943-sum-of-subarray-minimums
1078-remove-outermost-parentheses
1720-crawler-log-folder
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2846-robot-collisions
3001-apply-operations-to-maximize-score
3445-lexicographically-minimum-string-after-removing-stars

Simulation

0735-asteroid-collision
0921-spiral-matrix-iii
1184-car-pooling
2076-sum-of-digits-of-string-after-convert
2260-divide-a-string-into-groups-of-size-k
2265-partition-array-according-to-given-pivot
2479-meeting-rooms-iii
2551-apply-operations-to-an-array
2846-robot-collisions
3600-find-the-k-th-character-in-string-game-i
3790-fruits-into-baskets-ii

Tree

0896-smallest-subtree-with-all-the-deepest-nodes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0988-flip-equivalent-binary-trees
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1653-number-of-good-leaf-nodes-pairs
2306-create-binary-tree-from-descriptions
2400-minimum-score-after-removals-on-a-tree
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Binary Tree

0896-smallest-subtree-with-all-the-deepest-nodes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0988-flip-equivalent-binary-trees
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1653-number-of-good-leaf-nodes-pairs
2306-create-binary-tree-from-descriptions

Depth-First Search

0200-number-of-islands
0386-lexicographical-numbers
0896-smallest-subtree-with-all-the-deepest-nodes
0988-flip-equivalent-binary-trees
1218-lowest-common-ancestor-of-deepest-leaves
1350-remove-sub-folders-from-the-filesystem
1387-find-elements-in-a-contaminated-binary-tree
1653-number-of-good-leaf-nodes-pairs
1691-minimum-number-of-days-to-disconnect-island
2400-minimum-score-after-removals-on-a-tree
2793-count-the-number-of-complete-components
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Matrix

0073-set-matrix-zeroes
0200-number-of-islands
0921-spiral-matrix-iii
1496-lucky-numbers-in-a-matrix
1691-minimum-number-of-days-to-disconnect-island
2160-minimum-operations-to-make-a-uni-value-grid
2588-maximum-number-of-points-from-grid-queries
3227-find-missing-and-repeated-values
3627-find-minimum-time-to-reach-last-room-i
3648-find-the-maximum-number-of-fruits-collected

Dynamic Programming

0042-trapping-rain-water
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0264-ugly-number-ii
0368-largest-divisible-subset
0392-is-subsequence
0416-partition-equal-subset-sum
0650-2-keys-keyboard
0806-domino-and-tromino-tiling
0826-soup-servings
0943-sum-of-subarray-minimums
1170-shortest-common-supersequence
1196-filling-bookcase-shelves
1511-count-number-of-teams
1631-number-of-sub-arrays-with-odd-sum
1766-minimum-number-of-removals-to-make-mountain-array
1849-maximum-absolute-sum-of-any-subarray
2090-number-of-ways-to-arrive-at-destination
2262-solving-questions-with-brainpower
2267-minimum-difference-in-sums-after-removal-of-elements
2395-longest-binary-subsequence-less-than-or-equal-to-k
2415-count-the-number-of-ideal-arrays
3243-count-the-number-of-powerful-integers
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3618-find-the-original-typed-string-ii
3648-find-the-maximum-number-of-fruits-collected

Binary Indexed Tree

1511-count-number-of-teams
2280-count-good-triplets-in-an-array

Sliding Window

0003-longest-substring-without-repeating-characters
0030-substring-with-concatenation-of-all-words
0076-minimum-window-substring
0424-longest-repeating-character-replacement
0594-longest-harmonious-subsequence
1460-number-of-substrings-containing-all-three-characters
2229-maximum-fruits-harvested-after-at-most-k-steps
2255-minimum-swaps-to-group-all-1s-together-ii
2394-count-subarrays-with-score-less-than-k
2478-longest-nice-subarray
2498-smallest-subarrays-with-maximum-bitwise-or
2527-count-subarrays-with-fixed-bounds
2626-count-the-number-of-good-subarrays
2856-count-complete-subarrays-in-an-array
3213-count-subarrays-where-max-element-appears-at-least-k-times
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
3743-reschedule-meetings-for-maximum-free-time-i

Counting

0594-longest-harmonious-subsequence
0837-most-common-word
1160-letter-tile-possibilities
1227-number-of-equivalent-domino-pairs
1510-find-lucky-integer-in-an-array
2163-kth-distinct-string-in-an-array
2237-longest-palindrome-by-concatenating-two-letter-words
2308-divide-array-into-equal-pairs
2614-maximum-count-of-positive-integer-and-negative-integer
3360-minimum-deletions-to-make-string-k-special
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes

Math

0231-power-of-two
0264-ugly-number-ii
0273-integer-to-english-words
0368-largest-divisible-subset
0650-2-keys-keyboard
0795-k-th-symbol-in-grammar
0797-rabbits-in-forest
0826-soup-servings
1411-convert-binary-number-in-a-linked-list-to-integer
1421-find-numbers-with-even-number-of-digits
1529-max-difference-you-can-get-from-changing-an-integer
1631-number-of-sub-arrays-with-odd-sum
1889-check-if-number-is-a-sum-of-powers-of-three
1993-sum-of-all-subset-xor-totals
2050-count-good-numbers
2160-minimum-operations-to-make-a-uni-value-grid
2415-count-the-number-of-ideal-arrays
2575-minimum-cuts-to-divide-a-circle
2649-count-total-number-of-colored-cells
2704-maximum-difference-by-remapping-a-digit
2802-find-the-punishment-number-of-an-integer
2998-count-symmetric-integers
3001-apply-operations-to-maximize-score
3172-divisible-and-non-divisible-sums-difference
3201-distribute-candies-among-children-ii
3227-find-missing-and-repeated-values
3243-count-the-number-of-powerful-integers
3321-type-of-triangle
3548-find-the-count-of-good-integers
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii
3754-maximum-manhattan-distance-after-k-changes

Recursion

0231-power-of-two
0273-integer-to-english-words
0795-k-th-symbol-in-grammar
2050-count-good-numbers
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii

Breadth-First Search

0200-number-of-islands
0896-smallest-subtree-with-all-the-deepest-nodes
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1424-maximum-candies-you-can-get-from-boxes
1691-minimum-number-of-days-to-disconnect-island
2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Strongly Connected Component

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

Greedy

0011-container-with-most-water
0135-candy
0624-maximum-distance-in-arrays
0768-partition-labels
0797-rabbits-in-forest
0890-lemonade-change
1478-maximum-number-of-events-that-can-be-attended
1529-max-difference-you-can-get-from-changing-an-integer
1766-minimum-number-of-removals-to-make-mountain-array
2237-longest-palindrome-by-concatenating-two-letter-words
2387-partition-array-such-that-maximum-difference-is-k
2395-longest-binary-subsequence-less-than-or-equal-to-k
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2681-put-marbles-in-bags
2689-rearranging-fruits
2704-maximum-difference-by-remapping-a-digit
3001-apply-operations-to-maximize-score
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3241-divide-array-into-arrays-with-max-difference
3360-minimum-deletions-to-make-string-k-special
3445-lexicographically-minimum-string-after-removing-stars
3647-zero-array-transformation-iii
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3788-maximum-unique-subarray-sum-after-deletion

Heap (Priority Queue)

0264-ugly-number-ii
1184-car-pooling
1478-maximum-number-of-events-that-can-be-attended
2267-minimum-difference-in-sums-after-removal-of-elements
2479-meeting-rooms-iii
2588-maximum-number-of-points-from-grid-queries
2681-put-marbles-in-bags
3445-lexicographically-minimum-string-after-removing-stars
3627-find-minimum-time-to-reach-last-room-i
3647-zero-array-transformation-iii

Bit Manipulation

0231-power-of-two
0476-number-complement
0795-k-th-symbol-in-grammar
1993-sum-of-all-subset-xor-totals
2170-count-number-of-maximum-bitwise-or-subsets
2308-divide-array-into-equal-pairs
2400-minimum-score-after-removals-on-a-tree
2478-longest-nice-subarray
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
3348-minimum-cost-walk-in-weighted-graph
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii

Backtracking

1160-letter-tile-possibilities
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
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

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
3201-distribute-candies-among-children-ii
3548-find-the-count-of-good-integers
3741-reschedule-meetings-for-maximum-free-time-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair

Design

1387-find-elements-in-a-contaminated-binary-tree

Divide and Conquer

0925-construct-binary-tree-from-preorder-and-postorder-traversal
2280-count-good-triplets-in-an-array

Prefix Sum

0238-product-of-array-except-self
1184-car-pooling
1631-number-of-sub-arrays-with-odd-sum
2229-maximum-fruits-harvested-after-at-most-k-steps
2249-count-the-hidden-sequences
2394-count-subarrays-with-score-less-than-k
2915-count-of-interesting-subarrays
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3618-find-the-original-typed-string-ii
3647-zero-array-transformation-iii
3789-maximize-subarrays-after-removing-one-conflicting-pair

Database

0584-find-customer-referee
0595-big-countries
1258-article-views-i
1827-invalid-tweets
1908-recyclable-and-low-fat-products

Union Find

0128-longest-consecutive-sequence
0200-number-of-islands
1058-lexicographically-smallest-equivalent-string
2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph

Monotonic Stack

0042-trapping-rain-water
0943-sum-of-subarray-minimums
3001-apply-operations-to-maximize-score

Queue

2527-count-subarrays-with-fixed-bounds
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Graph

1424-maximum-candies-you-can-get-from-boxes
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph
3627-find-minimum-time-to-reach-last-room-i

Topological Sort

2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies

Geometry

2575-minimum-cuts-to-divide-a-circle

Shortest Path

2090-number-of-ways-to-arrive-at-destination
3627-find-minimum-time-to-reach-last-room-i

Number Theory

2415-count-the-number-of-ideal-arrays
3001-apply-operations-to-maximize-score

Combinatorics

1993-sum-of-all-subset-xor-totals
2415-count-the-number-of-ideal-arrays
3201-distribute-candies-among-children-ii
3548-find-the-count-of-good-integers

Segment Tree

2280-count-good-triplets-in-an-array
3789-maximize-subarrays-after-removing-one-conflicting-pair
3790-fruits-into-baskets-ii

Merge Sort

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

Ordered Set

2280-count-good-triplets-in-an-array
3790-fruits-into-baskets-ii

Monotonic Queue

2527-count-subarrays-with-fixed-bounds

Trie

0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
1350-remove-sub-folders-from-the-filesystem

Memoization

2395-longest-binary-subsequence-less-than-or-equal-to-k

Brainteaser

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

Probability and Statistics

0826-soup-servings