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

LeetCode Topics

Array

0073-set-matrix-zeroes
0118-pascals-triangle
0594-longest-harmonious-subsequence
0905-length-of-longest-fibonacci-subsequence
0952-word-subsets
1293-three-consecutive-odds
1335-maximum-candies-allocated-to-k-children
1364-tuple-with-same-product
1396-count-servers-that-communicate
1402-count-square-submatrices-with-all-ones
1421-find-numbers-with-even-number-of-digits
1477-product-of-the-last-k-numbers
1478-maximum-number-of-events-that-can-be-attended
1524-string-matching-in-an-array
1849-maximum-absolute-sum-of-any-subarray
1851-maximum-number-of-events-that-can-be-attended-ii
1876-map-of-highest-peak
1878-check-if-array-is-sorted-and-rotated
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1927-maximum-ascending-subarray-sum
2107-find-unique-binary-string
2144-maximum-difference-between-increasing-elements
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2215-finding-3-digit-even-numbers
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
2292-counting-words-with-a-given-prefix
2308-divide-array-into-equal-pairs
2320-find-all-k-distant-indices-in-an-array
2432-number-of-zero-filled-subarrays
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2478-longest-nice-subarray
2533-bitwise-xor-of-all-pairings
2551-apply-operations-to-an-array
2564-most-profitable-path-in-a-tree
2614-maximum-count-of-positive-integer-and-negative-integer
2685-first-completely-painted-row-or-column
2691-count-vowel-strings-in-ranges
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
3143-longest-unequal-adjacent-groups-subsequence-i
3152-maximum-value-of-an-ordered-triplet-ii
3154-maximum-value-of-an-ordered-triplet-i
3213-count-subarrays-where-max-element-appears-at-least-k-times
3227-find-missing-and-repeated-values
3251-maximum-area-of-longest-diagonal-rectangle
3309-count-prefix-and-suffix-pairs-i
3332-minimum-operations-to-exceed-threshold-value-ii
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
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
3490-find-the-maximum-length-of-valid-subsequence-i
3621-minimum-operations-to-make-array-values-equal-to-k
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3657-check-if-grid-can-be-cut-into-sections
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3747-maximum-difference-between-adjacent-elements-in-a-circular-array

String

0952-word-subsets
1170-shortest-common-supersequence
1302-delete-characters-to-make-fancy-string
1502-construct-k-palindrome-strings
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1524-string-matching-in-an-array
1537-maximum-score-after-splitting-a-string
1818-maximum-score-from-removing-substrings
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1915-check-if-one-string-swap-can-make-strings-equal
2021-remove-all-occurrences-of-a-substring
2059-unique-length-3-palindromic-subsequences
2107-find-unique-binary-string
2292-counting-words-with-a-given-prefix
2346-largest-3-same-digit-number-in-string
2456-construct-smallest-number-from-di-string
2691-count-vowel-strings-in-ranges
3143-longest-unequal-adjacent-groups-subsequence-i
3309-count-prefix-and-suffix-pairs-i
3396-valid-word
3447-clear-digits
3455-minimum-length-of-string-after-operations
3617-find-the-original-typed-string-i
3618-find-the-original-typed-string-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii

Prefix Sum

1477-product-of-the-last-k-numbers
1537-maximum-score-after-splitting-a-string
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
2059-unique-length-3-palindromic-subsequences
2145-grid-game
2249-count-the-hidden-sequences
2691-count-vowel-strings-in-ranges
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3618-find-the-original-typed-string-ii
3643-zero-array-transformation-ii
3647-zero-array-transformation-iii

String Matching

1524-string-matching-in-an-array
2292-counting-words-with-a-given-prefix
3309-count-prefix-and-suffix-pairs-i

Hash Table

0073-set-matrix-zeroes
0594-longest-harmonious-subsequence
0905-length-of-longest-fibonacci-subsequence
0952-word-subsets
1218-lowest-common-ancestor-of-deepest-leaves
1364-tuple-with-same-product
1387-find-elements-in-a-contaminated-binary-tree
1500-count-largest-group
1502-construct-k-palindrome-strings
1915-check-if-one-string-swap-can-make-strings-equal
2059-unique-length-3-palindromic-subsequences
2107-find-unique-binary-string
2215-finding-3-digit-even-numbers
2308-divide-array-into-equal-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2685-first-completely-painted-row-or-column
2766-find-the-prefix-common-array-of-two-arrays
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
3227-find-missing-and-repeated-values
3434-find-the-number-of-distinct-colors-among-the-balls
3455-minimum-length-of-string-after-operations
3621-minimum-operations-to-make-array-values-equal-to-k
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3656-minimum-number-of-operations-to-make-elements-in-array-distinct

Bit Manipulation

2059-unique-length-3-palindromic-subsequences
2308-divide-array-into-equal-pairs
2478-longest-nice-subarray
2509-minimize-xor
2533-bitwise-xor-of-all-pairings
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
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

Trie

3309-count-prefix-and-suffix-pairs-i

Rolling Hash

3309-count-prefix-and-suffix-pairs-i

Hash Function

3309-count-prefix-and-suffix-pairs-i

Counting

0594-longest-harmonious-subsequence
1364-tuple-with-same-product
1396-count-servers-that-communicate
1502-construct-k-palindrome-strings
1915-check-if-one-string-swap-can-make-strings-equal
2308-divide-array-into-equal-pairs
2614-maximum-count-of-positive-integer-and-negative-integer
3455-minimum-length-of-string-after-operations
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii

Greedy

1478-maximum-number-of-events-that-can-be-attended
1502-construct-k-palindrome-strings
1818-maximum-score-from-removing-substrings
2456-construct-smallest-number-from-di-string
2509-minimize-xor
3143-longest-unequal-adjacent-groups-subsequence-i
3647-zero-array-transformation-iii
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i

Brainteaser

2533-bitwise-xor-of-all-pairings

Matrix

0073-set-matrix-zeroes
1396-count-servers-that-communicate
1402-count-square-submatrices-with-all-ones
1876-map-of-highest-peak
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2685-first-completely-painted-row-or-column
3227-find-missing-and-repeated-values
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Breadth-First Search

1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1876-map-of-highest-peak
2564-most-profitable-path-in-a-tree

Depth-First Search

1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
2564-most-profitable-path-in-a-tree

Union Find

1396-count-servers-that-communicate

Linked List

0023-merge-k-sorted-lists

Divide and Conquer

0023-merge-k-sorted-lists

Heap (Priority Queue)

0023-merge-k-sorted-lists
1478-maximum-number-of-events-that-can-be-attended
2473-max-sum-of-a-pair-with-equal-sum-of-digits
3332-minimum-operations-to-exceed-threshold-value-ii
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3647-zero-array-transformation-iii

Merge Sort

0023-merge-k-sorted-lists

Simulation

2021-remove-all-occurrences-of-a-substring
2265-partition-array-according-to-given-pivot
2551-apply-operations-to-an-array
3332-minimum-operations-to-exceed-threshold-value-ii
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits
3600-find-the-k-th-character-in-string-game-i

Stack

1818-maximum-score-from-removing-substrings
2021-remove-all-occurrences-of-a-substring
2456-construct-smallest-number-from-di-string
3447-clear-digits

Sorting

0594-longest-harmonious-subsequence
1478-maximum-number-of-events-that-can-be-attended
1851-maximum-number-of-events-that-can-be-attended-ii
2160-minimum-operations-to-make-a-uni-value-grid
2215-finding-3-digit-even-numbers
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2888-minimum-index-of-a-valid-split
3430-count-days-without-meetings
3647-zero-array-transformation-iii
3657-check-if-grid-can-be-cut-into-sections

Math

0326-power-of-three
1421-find-numbers-with-even-number-of-digits
1477-product-of-the-last-k-numbers
1500-count-largest-group
1889-check-if-number-is-a-sum-of-powers-of-three
2160-minimum-operations-to-make-a-uni-value-grid
2415-count-the-number-of-ideal-arrays
2432-number-of-zero-filled-subarrays
2610-closest-prime-numbers-in-range
2649-count-total-number-of-colored-cells
2998-count-symmetric-integers
3227-find-missing-and-repeated-values
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3830-find-closest-person

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

Backtracking

1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
2107-find-unique-binary-string
2456-construct-smallest-number-from-di-string

Tree

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

Binary Tree

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

Graph

2564-most-profitable-path-in-a-tree
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Dynamic Programming

0118-pascals-triangle
0905-length-of-longest-fibonacci-subsequence
1170-shortest-common-supersequence
1402-count-square-submatrices-with-all-ones
1849-maximum-absolute-sum-of-any-subarray
1851-maximum-number-of-events-that-can-be-attended-ii
2262-solving-questions-with-brainpower
2415-count-the-number-of-ideal-arrays
3143-longest-unequal-adjacent-groups-subsequence-i
3490-find-the-maximum-length-of-valid-subsequence-i
3618-find-the-original-typed-string-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii

Two Pointers

2265-partition-array-according-to-given-pivot
2320-find-all-k-distant-indices-in-an-array
2551-apply-operations-to-an-array

Number Theory

2415-count-the-number-of-ideal-arrays
2610-closest-prime-numbers-in-range

Binary Search

1335-maximum-candies-allocated-to-k-children
1851-maximum-number-of-events-that-can-be-attended-ii
2614-maximum-count-of-positive-integer-and-negative-integer
3643-zero-array-transformation-ii

Sliding Window

0594-longest-harmonious-subsequence
2478-longest-nice-subarray
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
3743-reschedule-meetings-for-maximum-free-time-i

Queue

3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Enumeration

2215-finding-3-digit-even-numbers
2998-count-symmetric-integers
3741-reschedule-meetings-for-maximum-free-time-ii

Combinatorics

2415-count-the-number-of-ideal-arrays

Shortest Path

3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Recursion

0326-power-of-three
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii