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

LeetCode Topics

Array

0049-group-anagrams
0075-sort-colors
0169-majority-element
0217-contains-duplicate
0219-contains-duplicate-ii
0346-moving-average-from-data-stream
0350-intersection-of-two-arrays-ii
0448-find-all-numbers-disappeared-in-an-array
0525-contiguous-array
0599-minimum-index-sum-of-two-lists
0645-set-mismatch
0749-shortest-completing-word
0822-unique-morse-code-words
0837-most-common-word
1001-n-repeated-element-in-size-2n-array
1006-vowel-spellchecker
1018-largest-perimeter-triangle
1044-find-common-characters
1098-largest-unique-number
1112-find-words-that-can-be-formed-by-characters
1137-height-checker
1468-check-if-n-and-its-double-exist
1547-destination-city
1570-final-prices-with-a-special-discount-in-a-shop
1635-number-of-good-pairs
1786-count-the-number-of-consistent-strings
1848-sum-of-unique-elements
2159-two-out-of-three
2190-count-common-words-with-one-occurrence
2254-check-if-every-row-and-column-contains-all-numbers
2324-find-triangular-sum-of-an-array
2331-intersection-of-multiple-arrays
2486-most-frequent-even-element
2524-largest-positive-integer-that-exists-with-its-negative
2561-number-of-distinct-averages
2714-left-and-right-sum-differences
2892-check-if-array-is-good
3225-length-of-longest-subarray-with-at-most-k-frequency
3324-split-the-array
3704-count-partitions-with-even-sum-difference
3731-sum-of-variable-length-subarrays
3914-check-if-any-element-has-prime-frequency

Hash Table

0049-group-anagrams
0169-majority-element
0205-isomorphic-strings
0217-contains-duplicate
0219-contains-duplicate-ii
0242-valid-anagram
0290-word-pattern
0350-intersection-of-two-arrays-ii
0387-first-unique-character-in-a-string
0448-find-all-numbers-disappeared-in-an-array
0451-sort-characters-by-frequency
0525-contiguous-array
0599-minimum-index-sum-of-two-lists
0645-set-mismatch
0653-two-sum-iv-input-is-a-bst
0749-shortest-completing-word
0822-unique-morse-code-words
0837-most-common-word
0889-buddy-strings
0920-uncommon-words-from-two-sentences
1001-n-repeated-element-in-size-2n-array
1006-vowel-spellchecker
1044-find-common-characters
1098-largest-unique-number
1112-find-words-that-can-be-formed-by-characters
1264-maximum-number-of-words-you-can-type
1468-check-if-n-and-its-double-exist
1500-count-largest-group
1547-destination-city
1635-number-of-good-pairs
1746-largest-substring-between-two-equal-characters
1786-count-the-number-of-consistent-strings
1848-sum-of-unique-elements
1933-number-of-different-integers-in-a-string
2159-two-out-of-three
2190-count-common-words-with-one-occurrence
2254-check-if-every-row-and-column-contains-all-numbers
2331-intersection-of-multiple-arrays
2486-most-frequent-even-element
2524-largest-positive-integer-that-exists-with-its-negative
2561-number-of-distinct-averages
2824-check-if-the-number-is-fascinating
2892-check-if-array-is-good
3225-length-of-longest-subarray-with-at-most-k-frequency
3324-split-the-array
3408-count-the-number-of-special-characters-i
3872-find-most-frequent-vowel-and-consonant
3914-check-if-any-element-has-prime-frequency

Math

0067-add-binary
0342-power-of-four
1018-largest-perimeter-triangle
1500-count-largest-group
1635-number-of-good-pairs
1642-water-bottles
2324-find-triangular-sum-of-an-array
2824-check-if-the-number-is-fascinating
3336-water-bottles-ii
3704-count-partitions-with-even-sum-difference
3914-check-if-any-element-has-prime-frequency

Counting

0169-majority-element
0387-first-unique-character-in-a-string
0451-sort-characters-by-frequency
0837-most-common-word
0920-uncommon-words-from-two-sentences
1112-find-words-that-can-be-formed-by-characters
1341-split-a-string-in-balanced-strings
1635-number-of-good-pairs
1708-design-parking-system
1786-count-the-number-of-consistent-strings
1823-determine-if-string-halves-are-alike
1848-sum-of-unique-elements
2190-count-common-words-with-one-occurrence
2331-intersection-of-multiple-arrays
2486-most-frequent-even-element
3324-split-the-array
3872-find-most-frequent-vowel-and-consonant
3914-check-if-any-element-has-prime-frequency

String

0049-group-anagrams
0067-add-binary
0071-simplify-path
0165-compare-version-numbers
0205-isomorphic-strings
0242-valid-anagram
0290-word-pattern
0387-first-unique-character-in-a-string
0434-number-of-segments-in-a-string
0451-sort-characters-by-frequency
0599-minimum-index-sum-of-two-lists
0749-shortest-completing-word
0812-rotate-string
0822-unique-morse-code-words
0837-most-common-word
0874-backspace-string-compare
0889-buddy-strings
0920-uncommon-words-from-two-sentences
1006-vowel-spellchecker
1044-find-common-characters
1112-find-words-that-can-be-formed-by-characters
1128-remove-all-adjacent-duplicates-in-string
1264-maximum-number-of-words-you-can-type
1341-split-a-string-in-balanced-strings
1537-maximum-score-after-splitting-a-string
1547-destination-city
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1666-make-the-string-great
1746-largest-substring-between-two-equal-characters
1786-count-the-number-of-consistent-strings
1823-determine-if-string-halves-are-alike
1933-number-of-different-integers-in-a-string
2190-count-common-words-with-one-occurrence
3408-count-the-number-of-special-characters-i
3872-find-most-frequent-vowel-and-consonant

Sorting

0049-group-anagrams
0075-sort-colors
0169-majority-element
0217-contains-duplicate
0242-valid-anagram
0350-intersection-of-two-arrays-ii
0451-sort-characters-by-frequency
0645-set-mismatch
1018-largest-perimeter-triangle
1098-largest-unique-number
1137-height-checker
1468-check-if-n-and-its-double-exist
2331-intersection-of-multiple-arrays
2524-largest-positive-integer-that-exists-with-its-negative
2561-number-of-distinct-averages
2892-check-if-array-is-good

Heap (Priority Queue)

0451-sort-characters-by-frequency

Bucket Sort

0451-sort-characters-by-frequency

Sliding Window

0219-contains-duplicate-ii
3225-length-of-longest-subarray-with-at-most-k-frequency

Linked List

0083-remove-duplicates-from-sorted-list
0908-middle-of-the-linked-list

Two Pointers

0075-sort-colors
0165-compare-version-numbers
0350-intersection-of-two-arrays-ii
0653-two-sum-iv-input-is-a-bst
0874-backspace-string-compare
0908-middle-of-the-linked-list
1468-check-if-n-and-its-double-exist
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
2524-largest-positive-integer-that-exists-with-its-negative
2561-number-of-distinct-averages

Prefix Sum

0525-contiguous-array
1537-maximum-score-after-splitting-a-string
2714-left-and-right-sum-differences
3704-count-partitions-with-even-sum-difference
3731-sum-of-variable-length-subarrays

Stack

0071-simplify-path
0225-implement-stack-using-queues
0874-backspace-string-compare
1128-remove-all-adjacent-duplicates-in-string
1570-final-prices-with-a-special-discount-in-a-shop
1666-make-the-string-great

Simulation

0067-add-binary
0874-backspace-string-compare
1642-water-bottles
1708-design-parking-system
2324-find-triangular-sum-of-an-array
3336-water-bottles-ii

Design

0225-implement-stack-using-queues
0346-moving-average-from-data-stream
1708-design-parking-system

Queue

0225-implement-stack-using-queues
0346-moving-average-from-data-stream
0387-first-unique-character-in-a-string

Data Stream

0346-moving-average-from-data-stream

Monotonic Stack

1570-final-prices-with-a-special-discount-in-a-shop

Divide and Conquer

0169-majority-element

Binary Search

0350-intersection-of-two-arrays-ii
1468-check-if-n-and-its-double-exist

Counting Sort

1137-height-checker

Bit Manipulation

0067-add-binary
0342-power-of-four
0645-set-mismatch
1786-count-the-number-of-consistent-strings
2159-two-out-of-three

Tree

0110-balanced-binary-tree
0404-sum-of-left-leaves
0653-two-sum-iv-input-is-a-bst

Depth-First Search

0110-balanced-binary-tree
0404-sum-of-left-leaves
0653-two-sum-iv-input-is-a-bst

Breadth-First Search

0404-sum-of-left-leaves
0653-two-sum-iv-input-is-a-bst

Binary Search Tree

0653-two-sum-iv-input-is-a-bst

Binary Tree

0110-balanced-binary-tree
0404-sum-of-left-leaves
0653-two-sum-iv-input-is-a-bst

Number Theory

3914-check-if-any-element-has-prime-frequency

String Matching

0812-rotate-string
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence

Recursion

0342-power-of-four

Greedy

1018-largest-perimeter-triangle
1341-split-a-string-in-balanced-strings

Matrix

2254-check-if-every-row-and-column-contains-all-numbers

Combinatorics

2324-find-triangular-sum-of-an-array

Database

0175-combine-two-tables
0183-customers-who-never-order