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

LeetCode Topics

Array

0001-two-sum
0014-longest-common-prefix
0015-3sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0035-search-insert-position
0041-first-missing-positive
0053-maximum-subarray
0066-plus-one
0075-sort-colors
0088-merge-sorted-array
0121-best-time-to-buy-and-sell-stock
0136-single-number
0137-single-number-ii
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0189-rotate-array
0204-count-primes
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0219-contains-duplicate-ii
0228-summary-ranges
0229-majority-element-ii
0240-search-a-2d-matrix-ii
0268-missing-number
0283-move-zeroes
0287-find-the-duplicate-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0560-subarray-sum-equals-k
0561-array-partition
0645-set-mismatch
0704-binary-search
0724-find-pivot-index
0747-largest-number-at-least-twice-of-others
0896-monotonic-array
0905-sort-array-by-parity
0912-sort-an-array
0961-n-repeated-element-in-size-2n-array
0974-subarray-sums-divisible-by-k
1051-height-checker
1089-duplicate-zeros
1207-unique-number-of-occurrences
1295-find-numbers-with-even-number-of-digits
1304-find-n-unique-integers-sum-up-to-zero
1380-lucky-numbers-in-a-matrix
1394-find-lucky-integer-in-an-array
1431-kids-with-the-greatest-number-of-candies
1464-maximum-product-of-two-elements-in-an-array
1470-shuffle-the-array
1480-running-sum-of-1d-array
1528-shuffle-string
1572-matrix-diagonal-sum
1662-check-if-two-string-arrays-are-equivalent
1672-richest-customer-wealth
1684-count-the-number-of-consistent-strings
1752-check-if-array-is-sorted-and-rotated
1920-build-array-from-permutation
1929-concatenation-of-array
2114-maximum-number-of-words-found-in-sentences
3033-modify-the-matrix
3093-longest-common-suffix-queries

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0041-first-missing-positive
0169-majority-element
0217-contains-duplicate
0219-contains-duplicate-ii
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0383-ransom-note
0387-first-unique-character-in-a-string
0389-find-the-difference
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0560-subarray-sum-equals-k
0645-set-mismatch
0771-jewels-and-stones
0961-n-repeated-element-in-size-2n-array
0974-subarray-sums-divisible-by-k
1207-unique-number-of-occurrences
1394-find-lucky-integer-in-an-array
1684-count-the-number-of-consistent-strings
1790-check-if-one-string-swap-can-make-strings-equal
3121-count-the-number-of-special-characters-ii

Math

0013-roman-to-integer
0066-plus-one
0067-add-binary
0189-rotate-array
0204-count-primes
0231-power-of-two
0268-missing-number
0326-power-of-three
0342-power-of-four
1295-find-numbers-with-even-number-of-digits
1304-find-n-unique-integers-sum-up-to-zero
1342-number-of-steps-to-reduce-a-number-to-zero

Binary Search

0035-search-insert-position
0167-two-sum-ii-input-array-is-sorted
0240-search-a-2d-matrix-ii
0268-missing-number
0287-find-the-duplicate-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0704-binary-search

Bit Manipulation

0067-add-binary
0136-single-number
0137-single-number-ii
0231-power-of-two
0268-missing-number
0287-find-the-duplicate-number
0342-power-of-four
0389-find-the-difference
0645-set-mismatch
1342-number-of-steps-to-reduce-a-number-to-zero
1684-count-the-number-of-consistent-strings

Sorting

0015-3sum
0075-sort-colors
0088-merge-sorted-array
0169-majority-element
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0389-find-the-difference
0442-find-all-duplicates-in-an-array
0561-array-partition
0645-set-mismatch
0747-largest-number-at-least-twice-of-others
0905-sort-array-by-parity
0912-sort-an-array
1051-height-checker
1464-maximum-product-of-two-elements-in-an-array

Two Pointers

0015-3sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string
0075-sort-colors
0088-merge-sorted-array
0125-valid-palindrome
0167-two-sum-ii-input-array-is-sorted
0189-rotate-array
0283-move-zeroes
0287-find-the-duplicate-number
0344-reverse-string
0345-reverse-vowels-of-a-string
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0392-is-subsequence
0443-string-compression
0557-reverse-words-in-a-string-iii
0680-valid-palindrome-ii
0905-sort-array-by-parity
0917-reverse-only-letters
1089-duplicate-zeros

Sliding Window

0003-longest-substring-without-repeating-characters
0219-contains-duplicate-ii
1871-jump-game-vii

String

0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0014-longest-common-prefix
0020-valid-parentheses
0028-find-the-index-of-the-first-occurrence-in-a-string
0058-length-of-last-word
0067-add-binary
0125-valid-palindrome
0242-valid-anagram
0344-reverse-string
0345-reverse-vowels-of-a-string
0383-ransom-note
0387-first-unique-character-in-a-string
0389-find-the-difference
0392-is-subsequence
0443-string-compression
0551-student-attendance-record-i
0557-reverse-words-in-a-string-iii
0680-valid-palindrome-ii
0709-to-lower-case
0771-jewels-and-stones
0796-rotate-string
0917-reverse-only-letters
1108-defanging-an-ip-address
1528-shuffle-string
1662-check-if-two-string-arrays-are-equivalent
1678-goal-parser-interpretation
1684-count-the-number-of-consistent-strings
1790-check-if-one-string-swap-can-make-strings-equal
1871-jump-game-vii
2114-maximum-number-of-words-found-in-sentences
2129-capitalize-the-title
3093-longest-common-suffix-queries
3121-count-the-number-of-special-characters-ii

Simulation

0067-add-binary
1920-build-array-from-permutation
1929-concatenation-of-array

Greedy

0561-array-partition
0680-valid-palindrome-ii

Counting Sort

0169-majority-element
0229-majority-element-ii
0383-ransom-note
0387-first-unique-character-in-a-string
0561-array-partition
0912-sort-an-array
1051-height-checker
1394-find-lucky-integer-in-an-array
1684-count-the-number-of-consistent-strings
1790-check-if-one-string-swap-can-make-strings-equal

Divide and Conquer

0053-maximum-subarray
0169-majority-element
0215-kth-largest-element-in-an-array
0240-search-a-2d-matrix-ii
0912-sort-an-array

Matrix

0240-search-a-2d-matrix-ii
1380-lucky-numbers-in-a-matrix
1572-matrix-diagonal-sum
1672-richest-customer-wealth
3033-modify-the-matrix

Prefix Sum

0560-subarray-sum-equals-k
0724-find-pivot-index
0974-subarray-sums-divisible-by-k
1480-running-sum-of-1d-array
1871-jump-game-vii

Dynamic Programming

0053-maximum-subarray
0121-best-time-to-buy-and-sell-stock
0392-is-subsequence
1871-jump-game-vii

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
0912-sort-an-array
1464-maximum-product-of-two-elements-in-an-array

Enumeration

0204-count-primes

Number Theory

0204-count-primes

Recursion

0231-power-of-two
0326-power-of-three
0342-power-of-four

String Matching

0028-find-the-index-of-the-first-occurrence-in-a-string
0796-rotate-string

Merge Sort

0912-sort-an-array

Bucket Sort

0912-sort-an-array

Radix Sort

0912-sort-an-array

Quickselect

0215-kth-largest-element-in-an-array

Queue

0387-first-unique-character-in-a-string

Trie

0014-longest-common-prefix
3093-longest-common-suffix-queries

Stack

0020-valid-parentheses