LeetCode Topics

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

LeetCode Topics

String

Problem Name	Difficulty
0020-valid-parentheses
0028-find-the-index-of-the-first-occurrence-in-a-string
0058-length-of-last-word
0125-valid-palindrome	Easy
0205-isomorphic-strings	Easy
0242-valid-anagram	Easy
0290-word-pattern	Easy
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
3194-find-words-containing-character
3379-score-of-a-string

Linked List

Problem Name	Difficulty
2903-insert-greatest-common-divisors-in-linked-list

Math

Problem Name	Difficulty
0070-climbing-stairs
1642-water-bottles
2903-insert-greatest-common-divisors-in-linked-list

Number Theory

Problem Name	Difficulty
2903-insert-greatest-common-divisors-in-linked-list

Array

Problem Name	Difficulty
0001-two-sum	Easy
0011-container-with-most-water
0015-3sum
0026-remove-duplicates-from-sorted-array
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0042-trapping-rain-water
0053-maximum-subarray
0074-search-a-2d-matrix
0075-sort-colors	Medium
0081-search-in-rotated-sorted-array-ii
0128-longest-consecutive-sequence	Medium
0167-two-sum-ii-input-array-is-sorted
0169-majority-element	Easy
0217-contains-duplicate	Easy
0283-move-zeroes	Easy
0347-top-k-frequent-elements	Medium
0485-max-consecutive-ones
0704-binary-search
1018-binary-prefix-divisible-by-5
1441-build-an-array-with-stack-operations
1813-maximum-erasure-value
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1929-concatenation-of-array
2048-build-array-from-permutation
3194-find-words-containing-character
3490-find-the-maximum-length-of-valid-subsequence-i

Simulation

Problem Name	Difficulty
1441-build-an-array-with-stack-operations
1642-water-bottles
1929-concatenation-of-array
2048-build-array-from-permutation

Prefix Sum

Problem Name	Difficulty
1895-minimum-number-of-operations-to-move-all-balls-to-each-box

Two Pointers

Problem Name	Difficulty
0011-container-with-most-water
0015-3sum
0026-remove-duplicates-from-sorted-array
0028-find-the-index-of-the-first-occurrence-in-a-string
0042-trapping-rain-water
0075-sort-colors	Medium
0125-valid-palindrome	Easy
0167-two-sum-ii-input-array-is-sorted
0283-move-zeroes	Easy

Greedy

Problem Name	Difficulty
0011-container-with-most-water

Sorting

Problem Name	Difficulty
0015-3sum
0075-sort-colors	Medium
0169-majority-element	Easy
0217-contains-duplicate	Easy
0242-valid-anagram	Easy
0347-top-k-frequent-elements	Medium

String Matching

Problem Name	Difficulty
0028-find-the-index-of-the-first-occurrence-in-a-string

Dynamic Programming

Problem Name	Difficulty
0042-trapping-rain-water
0053-maximum-subarray
0070-climbing-stairs
3490-find-the-maximum-length-of-valid-subsequence-i

Binary Search

Problem Name	Difficulty
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0074-search-a-2d-matrix
0081-search-in-rotated-sorted-array-ii
0167-two-sum-ii-input-array-is-sorted
0278-first-bad-version
0704-binary-search

Stack

Problem Name	Difficulty
0020-valid-parentheses
0042-trapping-rain-water
1441-build-an-array-with-stack-operations

Monotonic Stack

Problem Name	Difficulty
0042-trapping-rain-water

Hash Table

Problem Name	Difficulty
0001-two-sum	Easy
0128-longest-consecutive-sequence	Medium
0169-majority-element	Easy
0205-isomorphic-strings	Easy
0217-contains-duplicate	Easy
0242-valid-anagram	Easy
0290-word-pattern	Easy
0347-top-k-frequent-elements	Medium
1813-maximum-erasure-value

Sliding Window

Problem Name	Difficulty
1813-maximum-erasure-value

Divide and Conquer

Problem Name	Difficulty
0053-maximum-subarray
0169-majority-element	Easy
0190-reverse-bits
0347-top-k-frequent-elements	Medium

Memoization

Problem Name	Difficulty
0070-climbing-stairs

Matrix

Problem Name	Difficulty
0074-search-a-2d-matrix

Bit Manipulation

Problem Name	Difficulty
0190-reverse-bits
0693-binary-number-with-alternating-bits
1018-binary-prefix-divisible-by-5

Counting

Problem Name	Difficulty
0169-majority-element	Easy
0347-top-k-frequent-elements	Medium

Heap (Priority Queue)

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Bucket Sort

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Quickselect

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Union-Find

Problem Name	Difficulty
0128-longest-consecutive-sequence	Medium

Interactive

Problem Name	Difficulty
0278-first-bad-version

Name		Name	Last commit message	Last commit date
0001-two-sum		0001-two-sum
0002-add-two-numbers		0002-add-two-numbers
0004-median-of-two-sorted-arrays		0004-median-of-two-sorted-arrays
0007-reverse-integer		0007-reverse-integer
0008-string-to-integer-atoi		0008-string-to-integer-atoi
0009-palindrome-number		0009-palindrome-number
0011-container-with-most-water		0011-container-with-most-water
0015-3sum		0015-3sum
0019-remove-nth-node-from-end-of-list		0019-remove-nth-node-from-end-of-list
0020-valid-parentheses		0020-valid-parentheses
0021-merge-two-sorted-lists		0021-merge-two-sorted-lists
0024-swap-nodes-in-pairs		0024-swap-nodes-in-pairs
0026-remove-duplicates-from-sorted-array		0026-remove-duplicates-from-sorted-array
0027-remove-element		0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string		0028-find-the-index-of-the-first-occurrence-in-a-string
0033-search-in-rotated-sorted-array		0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array		0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position		0035-search-insert-position
0042-trapping-rain-water		0042-trapping-rain-water
0050-powx-n		0050-powx-n
0053-maximum-subarray		0053-maximum-subarray
0058-length-of-last-word		0058-length-of-last-word
0061-rotate-list		0061-rotate-list
0062-unique-paths		0062-unique-paths
0063-unique-paths-ii		0063-unique-paths-ii
0064-minimum-path-sum		0064-minimum-path-sum
0066-plus-one		0066-plus-one
0069-sqrtx		0069-sqrtx
0070-climbing-stairs		0070-climbing-stairs
0074-search-a-2d-matrix		0074-search-a-2d-matrix
0075-sort-colors		0075-sort-colors
0081-search-in-rotated-sorted-array-ii		0081-search-in-rotated-sorted-array-ii
0083-remove-duplicates-from-sorted-list		0083-remove-duplicates-from-sorted-list
0088-merge-sorted-array		0088-merge-sorted-array
0094-binary-tree-inorder-traversal		0094-binary-tree-inorder-traversal
0100-same-tree		0100-same-tree
0104-maximum-depth-of-binary-tree		0104-maximum-depth-of-binary-tree
0125-valid-palindrome		0125-valid-palindrome
0128-longest-consecutive-sequence		0128-longest-consecutive-sequence
0141-linked-list-cycle		0141-linked-list-cycle
0144-binary-tree-preorder-traversal		0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal		0145-binary-tree-postorder-traversal
0160-intersection-of-two-linked-lists		0160-intersection-of-two-linked-lists
0167-two-sum-ii-input-array-is-sorted		0167-two-sum-ii-input-array-is-sorted
0169-majority-element		0169-majority-element
0175-combine-two-tables		0175-combine-two-tables
0176-second-highest-salary		0176-second-highest-salary
0177-nth-highest-salary		0177-nth-highest-salary
0178-rank-scores		0178-rank-scores
0180-consecutive-numbers		0180-consecutive-numbers
0181-employees-earning-more-than-their-managers		0181-employees-earning-more-than-their-managers
0182-duplicate-emails		0182-duplicate-emails
0183-customers-who-never-order		0183-customers-who-never-order
0184-department-highest-salary		0184-department-highest-salary
0185-department-top-three-salaries		0185-department-top-three-salaries
0190-reverse-bits		0190-reverse-bits
0192-word-frequency		0192-word-frequency
0195-tenth-line		0195-tenth-line
0196-delete-duplicate-emails		0196-delete-duplicate-emails
0197-rising-temperature		0197-rising-temperature
0203-remove-linked-list-elements		0203-remove-linked-list-elements
0205-isomorphic-strings		0205-isomorphic-strings
0206-reverse-linked-list		0206-reverse-linked-list
0217-contains-duplicate		0217-contains-duplicate
0225-implement-stack-using-queues		0225-implement-stack-using-queues
0237-delete-node-in-a-linked-list		0237-delete-node-in-a-linked-list
0242-valid-anagram		0242-valid-anagram
0258-add-digits		0258-add-digits
0268-missing-number		0268-missing-number
0278-first-bad-version		0278-first-bad-version
0283-move-zeroes		0283-move-zeroes
0290-word-pattern		0290-word-pattern
0326-power-of-three		0326-power-of-three
0342-power-of-four		0342-power-of-four
0344-reverse-string		0344-reverse-string
0345-reverse-vowels-of-a-string		0345-reverse-vowels-of-a-string
0347-top-k-frequent-elements		0347-top-k-frequent-elements
0349-intersection-of-two-arrays		0349-intersection-of-two-arrays
0367-valid-perfect-square		0367-valid-perfect-square
0387-first-unique-character-in-a-string		0387-first-unique-character-in-a-string
0412-fizz-buzz		0412-fizz-buzz
0485-max-consecutive-ones		0485-max-consecutive-ones
0492-construct-the-rectangle		0492-construct-the-rectangle
0495-teemo-attacking		0495-teemo-attacking
0500-keyboard-row		0500-keyboard-row
0507-perfect-number		0507-perfect-number
0511-game-play-analysis-i		0511-game-play-analysis-i
0570-managers-with-at-least-5-direct-reports		0570-managers-with-at-least-5-direct-reports
0584-find-customer-referee		0584-find-customer-referee
0586-customer-placing-the-largest-number-of-orders		0586-customer-placing-the-largest-number-of-orders
0595-big-countries		0595-big-countries
0596-classes-with-at-least-5-students		0596-classes-with-at-least-5-students
0599-minimum-index-sum-of-two-lists		0599-minimum-index-sum-of-two-lists
0607-sales-person		0607-sales-person
0619-biggest-single-number		0619-biggest-single-number
0620-not-boring-movies		0620-not-boring-movies
0627-swap-salary		0627-swap-salary
0628-maximum-product-of-three-numbers		0628-maximum-product-of-three-numbers
0657-robot-return-to-origin		0657-robot-return-to-origin
0693-binary-number-with-alternating-bits		0693-binary-number-with-alternating-bits

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Array

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Dynamic Programming

Binary Search

Stack

Monotonic Stack

Hash Table

Sliding Window

Divide and Conquer

Memoization

Matrix

Bit Manipulation

Counting

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Bucket Sort

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