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leetcode

Collection of LeetCode questions to ace the coding interview! - Created using LeetHub

Math

0007-reverse-integer
0523-continuous-subarray-sum

Array

0330-patching-array
0502-ipo
0523-continuous-subarray-sum
0853-most-profit-assigning-work
0876-hand-of-straights
0982-minimum-increment-to-make-array-unique
1044-find-common-characters
1138-grumpy-bookstore-owner
1217-relative-sort-array
1605-minimum-number-of-days-to-make-m-bouquets
1730-special-array-with-x-elements-greater-than-or-equal-x

Hash Table

0017-letter-combinations-of-a-phone-number
0523-continuous-subarray-sum
0876-hand-of-straights
1044-find-common-characters
1217-relative-sort-array

String

0017-letter-combinations-of-a-phone-number
1044-find-common-characters
1321-get-equal-substrings-within-budget

Greedy

0330-patching-array
0502-ipo
0853-most-profit-assigning-work
0876-hand-of-straights
0982-minimum-increment-to-make-array-unique

Sorting

0502-ipo
0853-most-profit-assigning-work
0876-hand-of-straights
0982-minimum-increment-to-make-array-unique
1217-relative-sort-array
1730-special-array-with-x-elements-greater-than-or-equal-x

Prefix Sum

0523-continuous-subarray-sum
1321-get-equal-substrings-within-budget

Binary Search

0853-most-profit-assigning-work
1321-get-equal-substrings-within-budget
1605-minimum-number-of-days-to-make-m-bouquets
1730-special-array-with-x-elements-greater-than-or-equal-x

Sliding Window

1138-grumpy-bookstore-owner
1321-get-equal-substrings-within-budget

Counting Sort

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

Linked List

0024-swap-nodes-in-pairs

Recursion

0024-swap-nodes-in-pairs

Heap (Priority Queue)

0502-ipo

Two Pointers

0853-most-profit-assigning-work

Backtracking

0017-letter-combinations-of-a-phone-number

Tree

1114-binary-search-tree-to-greater-sum-tree

Depth-First Search

1114-binary-search-tree-to-greater-sum-tree

Binary Search Tree

1114-binary-search-tree-to-greater-sum-tree

Binary Tree

1114-binary-search-tree-to-greater-sum-tree

LeetCode Topics

Math

0368-largest-divisible-subset
0797-rabbits-in-forest
1477-product-of-the-last-k-numbers
1500-count-largest-group
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
2160-minimum-operations-to-make-a-uni-value-grid
2415-count-the-number-of-ideal-arrays
2610-closest-prime-numbers-in-range
2645-pass-the-pillow
2649-count-total-number-of-colored-cells
2802-find-the-punishment-number-of-an-integer
2998-count-symmetric-integers
3001-apply-operations-to-maximize-score
3227-find-missing-and-repeated-values
3243-count-the-number-of-powerful-integers
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations

Simulation

2048-build-array-from-permutation
2265-partition-array-according-to-given-pivot
2551-apply-operations-to-an-array
2645-pass-the-pillow
3434-find-the-number-of-distinct-colors-among-the-balls

Array

0075-sort-colors
0088-merge-sorted-array
0368-largest-divisible-subset
0416-partition-equal-subset-sum
0797-rabbits-in-forest
0905-length-of-longest-fibonacci-subsequence
1025-minimum-cost-for-tickets
1049-minimum-domino-rotations-for-equal-row
1227-number-of-equivalent-domino-pairs
1293-three-consecutive-odds
1335-maximum-candies-allocated-to-k-children
1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
1656-count-good-triplets
1819-construct-the-lexicographically-largest-valid-sequence
1849-maximum-absolute-sum-of-any-subarray
1993-sum-of-all-subset-xor-totals
2048-build-array-from-permutation
2160-minimum-operations-to-make-a-uni-value-grid
2180-maximum-number-of-tasks-you-can-assign
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2249-count-the-hidden-sequences
2262-solving-questions-with-brainpower
2265-partition-array-according-to-given-pivot
2277-count-equal-and-divisible-pairs-in-an-array
2280-count-good-triplets-in-an-array
2308-divide-array-into-equal-pairs
2394-count-subarrays-with-score-less-than-k
2478-longest-nice-subarray
2527-count-subarrays-with-fixed-bounds
2551-apply-operations-to-an-array
2564-most-profitable-path-in-a-tree
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
2690-house-robber-iv
2699-count-the-number-of-fair-pairs
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
3001-apply-operations-to-maximize-score
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3152-maximum-value-of-an-ordered-triplet-ii
3154-maximum-value-of-an-ordered-triplet-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3213-count-subarrays-where-max-element-appears-at-least-k-times
3227-find-missing-and-repeated-values
3348-minimum-cost-walk-in-weighted-graph
3430-count-days-without-meetings
3434-find-the-number-of-distinct-colors-among-the-balls
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3621-minimum-operations-to-make-array-values-equal-to-k
3627-find-minimum-time-to-reach-last-room-i
3643-zero-array-transformation-ii
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

Dynamic Programming

0368-largest-divisible-subset
0416-partition-equal-subset-sum
0806-domino-and-tromino-tiling
0868-push-dominoes
0905-length-of-longest-fibonacci-subsequence
1025-minimum-cost-for-tickets
1170-shortest-common-supersequence
1631-number-of-sub-arrays-with-odd-sum
1849-maximum-absolute-sum-of-any-subarray
2090-number-of-ways-to-arrive-at-destination
2262-solving-questions-with-brainpower
2415-count-the-number-of-ideal-arrays
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3243-count-the-number-of-powerful-integers
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations

Hash Table

0768-partition-labels
0797-rabbits-in-forest
0905-length-of-longest-fibonacci-subsequence
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
1500-count-largest-group
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2308-divide-array-into-equal-pairs
2626-count-the-number-of-good-subarrays
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
3434-find-the-number-of-distinct-colors-among-the-balls
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3621-minimum-operations-to-make-array-values-equal-to-k
3630-total-characters-in-string-after-transformations-ii
3656-minimum-number-of-operations-to-make-elements-in-array-distinct

Design

1387-find-elements-in-a-contaminated-binary-tree
1477-product-of-the-last-k-numbers

Data Stream

1477-product-of-the-last-k-numbers

Prefix Sum

1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
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
3643-zero-array-transformation-ii

Backtracking

1160-letter-tile-possibilities
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1819-construct-the-lexicographically-largest-valid-sequence
1993-sum-of-all-subset-xor-totals
2456-construct-smallest-number-from-di-string
2802-find-the-punishment-number-of-an-integer

String

0038-count-and-say
0768-partition-labels
0868-push-dominoes
1093-recover-a-tree-from-preorder-traversal
1160-letter-tile-possibilities
1170-shortest-common-supersequence
1460-number-of-substrings-containing-all-three-characters
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2456-construct-smallest-number-from-di-string
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3243-count-the-number-of-powerful-integers
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations

Counting

1160-letter-tile-possibilities
1227-number-of-equivalent-domino-pairs
2237-longest-palindrome-by-concatenating-two-letter-words
2308-divide-array-into-equal-pairs
2614-maximum-count-of-positive-integer-and-negative-integer
3630-total-characters-in-string-after-transformations-ii

Stack

2456-construct-smallest-number-from-di-string
3001-apply-operations-to-maximize-score

Greedy

0768-partition-labels
0797-rabbits-in-forest
1049-minimum-domino-rotations-for-equal-row
2180-maximum-number-of-tasks-you-can-assign
2237-longest-palindrome-by-concatenating-two-letter-words
2456-construct-smallest-number-from-di-string
2681-put-marbles-in-bags
3001-apply-operations-to-maximize-score
3143-longest-unequal-adjacent-groups-subsequence-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros

Tree

1093-recover-a-tree-from-preorder-traversal
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
2564-most-profitable-path-in-a-tree
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Depth-First Search

1093-recover-a-tree-from-preorder-traversal
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
2564-most-profitable-path-in-a-tree
2793-count-the-number-of-complete-components
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Breadth-First Search

1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
2564-most-profitable-path-in-a-tree
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

Binary Tree

1093-recover-a-tree-from-preorder-traversal
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree

Two Pointers

0075-sort-colors
0088-merge-sorted-array
0768-partition-labels
0868-push-dominoes
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

Sorting

0075-sort-colors
0088-merge-sorted-array
0368-largest-divisible-subset
2160-minimum-operations-to-make-a-uni-value-grid
2180-maximum-number-of-tasks-you-can-assign
2215-finding-3-digit-even-numbers
2588-maximum-number-of-points-from-grid-queries
2681-put-marbles-in-bags
2699-count-the-number-of-fair-pairs
2888-minimum-index-of-a-valid-split
3001-apply-operations-to-maximize-score
3430-count-days-without-meetings
3657-check-if-grid-can-be-cut-into-sections

Graph

2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2564-most-profitable-path-in-a-tree
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph
3627-find-minimum-time-to-reach-last-room-i

Matrix

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

Number Theory

2415-count-the-number-of-ideal-arrays
2610-closest-prime-numbers-in-range
3001-apply-operations-to-maximize-score

Sliding Window

1460-number-of-substrings-containing-all-three-characters
2394-count-subarrays-with-score-less-than-k
2478-longest-nice-subarray
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

Binary Search

1335-maximum-candies-allocated-to-k-children
2180-maximum-number-of-tasks-you-can-assign
2280-count-good-triplets-in-an-array
2394-count-subarrays-with-score-less-than-k
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
3643-zero-array-transformation-ii

Bit Manipulation

1993-sum-of-all-subset-xor-totals
2308-divide-array-into-equal-pairs
2478-longest-nice-subarray
3348-minimum-cost-walk-in-weighted-graph
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Queue

2180-maximum-number-of-tasks-you-can-assign
2527-count-subarrays-with-fixed-bounds
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Union Find

2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph

Topological Sort

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

Shortest Path

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

Heap (Priority Queue)

2588-maximum-number-of-points-from-grid-queries
2681-put-marbles-in-bags
3627-find-minimum-time-to-reach-last-room-i

Monotonic Stack

3001-apply-operations-to-maximize-score

Combinatorics

1993-sum-of-all-subset-xor-totals
2415-count-the-number-of-ideal-arrays
3637-count-number-of-balanced-permutations

Enumeration

1656-count-good-triplets
1993-sum-of-all-subset-xor-totals
2215-finding-3-digit-even-numbers
2998-count-symmetric-integers

Divide and Conquer

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

Binary Indexed Tree

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

Segment Tree

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

Merge Sort

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

Ordered Set

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

Monotonic Queue

2180-maximum-number-of-tasks-you-can-assign
2527-count-subarrays-with-fixed-bounds

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