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

LeetCode Topics

Array

0001-two-sum
0014-longest-common-prefix
0026-remove-duplicates-from-sorted-array
0027-remove-element
0034-find-first-and-last-position-of-element-in-sorted-array
0049-group-anagrams
0075-sort-colors
0084-largest-rectangle-in-histogram
0088-merge-sorted-array
0136-single-number
0162-find-peak-element
0169-majority-element
0189-rotate-array
0204-count-primes
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0229-majority-element-ii
0268-missing-number
0283-move-zeroes
0287-find-the-duplicate-number
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0414-third-maximum-number
0442-find-all-duplicates-in-an-array
0485-max-consecutive-ones
0496-next-greater-element-i
0682-baseball-game
0792-binary-search
0861-flipping-an-image
0932-monotonic-array
1001-n-repeated-element-in-size-2n-array
1019-squares-of-a-sorted-array
1072-next-greater-node-in-linked-list
1319-unique-number-of-occurrences
1407-group-the-people-given-the-group-size-they-belong-to
1468-check-if-n-and-its-double-exist
1482-how-many-numbers-are-smaller-than-the-current-number
1510-find-lucky-integer-in-an-array
1511-count-number-of-teams
1528-kids-with-the-greatest-number-of-candies
1570-final-prices-with-a-special-discount-in-a-shop
1580-shuffle-the-array
1603-running-sum-of-1d-array
1635-number-of-good-pairs
1656-count-good-triplets
1677-matrix-diagonal-sum
1781-check-if-two-string-arrays-are-equivalent
1791-richest-customer-wealth
1833-find-the-highest-altitude
1848-sum-of-unique-elements
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1961-maximum-ice-cream-bars
2048-build-array-from-permutation
2058-concatenation-of-array
2614-maximum-count-of-positive-integer-and-negative-integer

Binary Search

0034-find-first-and-last-position-of-element-in-sorted-array
0069-sqrtx
0162-find-peak-element
0222-count-complete-tree-nodes
0268-missing-number
0287-find-the-duplicate-number
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0367-valid-perfect-square
0792-binary-search
1468-check-if-n-and-its-double-exist
2614-maximum-count-of-positive-integer-and-negative-integer

Counting

0169-majority-element
0229-majority-element-ii
0347-top-k-frequent-elements
1510-find-lucky-integer-in-an-array
1635-number-of-good-pairs
1823-determine-if-string-halves-are-alike
1848-sum-of-unique-elements
2614-maximum-count-of-positive-integer-and-negative-integer

Hash Table

0001-two-sum
0049-group-anagrams
0141-linked-list-cycle
0142-linked-list-cycle-ii
0160-intersection-of-two-linked-lists
0169-majority-element
0217-contains-duplicate
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0442-find-all-duplicates-in-an-array
0496-next-greater-element-i
0653-two-sum-iv-input-is-a-bst
0782-jewels-and-stones
1001-n-repeated-element-in-size-2n-array
1319-unique-number-of-occurrences
1407-group-the-people-given-the-group-size-they-belong-to
1468-check-if-n-and-its-double-exist
1482-how-many-numbers-are-smaller-than-the-current-number
1510-find-lucky-integer-in-an-array
1635-number-of-good-pairs
1848-sum-of-unique-elements

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0083-remove-duplicates-from-sorted-list
0092-reverse-linked-list-ii
0114-flatten-binary-tree-to-linked-list
0141-linked-list-cycle
0142-linked-list-cycle-ii
0148-sort-list
0160-intersection-of-two-linked-lists
0203-remove-linked-list-elements
0206-reverse-linked-list
0234-palindrome-linked-list
0237-delete-node-in-a-linked-list
0445-add-two-numbers-ii
0528-swapping-nodes-in-a-linked-list
0908-middle-of-the-linked-list
1072-next-greater-node-in-linked-list
1765-merge-in-between-linked-lists

Math

0002-add-two-numbers
0009-palindrome-number
0069-sqrtx
0189-rotate-array
0204-count-primes
0268-missing-number
0367-valid-perfect-square
0412-fizz-buzz
0445-add-two-numbers-ii
0507-perfect-number
0728-self-dividing-numbers
1013-fibonacci-number
1406-subtract-the-product-and-sum-of-digits-of-an-integer
1444-number-of-steps-to-reduce-a-number-to-zero
1630-count-odd-numbers-in-an-interval-range
1635-number-of-good-pairs
2383-add-two-integers

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group
0203-remove-linked-list-elements
0206-reverse-linked-list
0234-palindrome-linked-list
1013-fibonacci-number

String

0014-longest-common-prefix
0020-valid-parentheses
0049-group-anagrams
0058-length-of-last-word
0125-valid-palindrome
0242-valid-anagram
0344-reverse-string
0412-fizz-buzz
0551-student-attendance-record-i
0782-jewels-and-stones
0874-backspace-string-compare
1128-remove-all-adjacent-duplicates-in-string
1205-defanging-an-ip-address
1666-make-the-string-great
1737-maximum-nesting-depth-of-the-parentheses
1781-check-if-two-string-arrays-are-equivalent
1797-goal-parser-interpretation
1823-determine-if-string-halves-are-alike
1894-merge-strings-alternately
1895-minimum-number-of-operations-to-move-all-balls-to-each-box

Trie

0014-longest-common-prefix

Two Pointers

0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0027-remove-element
0061-rotate-list
0075-sort-colors
0082-remove-duplicates-from-sorted-list-ii
0088-merge-sorted-array
0125-valid-palindrome
0141-linked-list-cycle
0142-linked-list-cycle-ii
0148-sort-list
0160-intersection-of-two-linked-lists
0189-rotate-array
0234-palindrome-linked-list
0283-move-zeroes
0287-find-the-duplicate-number
0344-reverse-string
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0528-swapping-nodes-in-a-linked-list
0653-two-sum-iv-input-is-a-bst
0861-flipping-an-image
0874-backspace-string-compare
0908-middle-of-the-linked-list
1019-squares-of-a-sorted-array
1468-check-if-n-and-its-double-exist
1894-merge-strings-alternately

Stack

0020-valid-parentheses
0084-largest-rectangle-in-histogram
0094-binary-tree-inorder-traversal
0114-flatten-binary-tree-to-linked-list
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0234-palindrome-linked-list
0445-add-two-numbers-ii
0496-next-greater-element-i
0682-baseball-game
0874-backspace-string-compare
0933-increasing-order-search-tree
1072-next-greater-node-in-linked-list
1128-remove-all-adjacent-duplicates-in-string
1570-final-prices-with-a-special-discount-in-a-shop
1666-make-the-string-great
1737-maximum-nesting-depth-of-the-parentheses

Sorting

0049-group-anagrams
0075-sort-colors
0088-merge-sorted-array
0148-sort-list
0169-majority-element
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii
0414-third-maximum-number
1019-squares-of-a-sorted-array
1427-all-elements-in-two-binary-search-trees
1468-check-if-n-and-its-double-exist
1482-how-many-numbers-are-smaller-than-the-current-number
1961-maximum-ice-cream-bars

Monotonic Stack

0084-largest-rectangle-in-histogram
0496-next-greater-element-i
1072-next-greater-node-in-linked-list
1570-final-prices-with-a-special-discount-in-a-shop

Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0114-flatten-binary-tree-to-linked-list
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0222-count-complete-tree-nodes
0226-invert-binary-tree
0404-sum-of-left-leaves
0501-find-mode-in-binary-search-tree
0530-minimum-absolute-difference-in-bst
0653-two-sum-iv-input-is-a-bst
0671-second-minimum-node-in-a-binary-tree
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0799-minimum-distance-between-bst-nodes
0904-leaf-similar-trees
0933-increasing-order-search-tree
0975-range-sum-of-bst
1005-univalued-binary-tree
1114-binary-search-tree-to-greater-sum-tree
1254-deepest-leaves-sum
1427-all-elements-in-two-binary-search-trees
1498-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree

Depth-First Search

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0114-flatten-binary-tree-to-linked-list
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0226-invert-binary-tree
0404-sum-of-left-leaves
0501-find-mode-in-binary-search-tree
0530-minimum-absolute-difference-in-bst
0653-two-sum-iv-input-is-a-bst
0671-second-minimum-node-in-a-binary-tree
0799-minimum-distance-between-bst-nodes
0904-leaf-similar-trees
0933-increasing-order-search-tree
0975-range-sum-of-bst
1005-univalued-binary-tree
1114-binary-search-tree-to-greater-sum-tree
1254-deepest-leaves-sum
1427-all-elements-in-two-binary-search-trees
1498-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree

Binary Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0114-flatten-binary-tree-to-linked-list
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0222-count-complete-tree-nodes
0226-invert-binary-tree
0404-sum-of-left-leaves
0501-find-mode-in-binary-search-tree
0530-minimum-absolute-difference-in-bst
0653-two-sum-iv-input-is-a-bst
0671-second-minimum-node-in-a-binary-tree
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0799-minimum-distance-between-bst-nodes
0904-leaf-similar-trees
0933-increasing-order-search-tree
0975-range-sum-of-bst
1005-univalued-binary-tree
1114-binary-search-tree-to-greater-sum-tree
1254-deepest-leaves-sum
1427-all-elements-in-two-binary-search-trees
1498-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree

Binary Search Tree

0098-validate-binary-search-tree
0501-find-mode-in-binary-search-tree
0530-minimum-absolute-difference-in-bst
0653-two-sum-iv-input-is-a-bst
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0799-minimum-distance-between-bst-nodes
0933-increasing-order-search-tree
0975-range-sum-of-bst
1114-binary-search-tree-to-greater-sum-tree
1427-all-elements-in-two-binary-search-trees

Breadth-First Search

0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0226-invert-binary-tree
0404-sum-of-left-leaves
0530-minimum-absolute-difference-in-bst
0653-two-sum-iv-input-is-a-bst
0799-minimum-distance-between-bst-nodes
1005-univalued-binary-tree
1254-deepest-leaves-sum
1498-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree

Bit Manipulation

0136-single-number
0222-count-complete-tree-nodes
0268-missing-number
0287-find-the-duplicate-number
0861-flipping-an-image
1444-number-of-steps-to-reduce-a-number-to-zero

Divide and Conquer

0148-sort-list
0169-majority-element
0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Merge Sort

0148-sort-list

Enumeration

0204-count-primes
1656-count-good-triplets

Number Theory

0204-count-primes

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Bucket Sort

0347-top-k-frequent-elements

Simulation

0412-fizz-buzz
0682-baseball-game
0861-flipping-an-image
0874-backspace-string-compare
2048-build-array-from-permutation
2058-concatenation-of-array

Dynamic Programming

1013-fibonacci-number
1511-count-number-of-teams

Memoization

1013-fibonacci-number

Matrix

0861-flipping-an-image
1677-matrix-diagonal-sum
1791-richest-customer-wealth

Greedy

1407-group-the-people-given-the-group-size-they-belong-to
1961-maximum-ice-cream-bars

Counting Sort

1482-how-many-numbers-are-smaller-than-the-current-number
1961-maximum-ice-cream-bars

Binary Indexed Tree

1511-count-number-of-teams

Segment Tree

1511-count-number-of-teams

Prefix Sum

1603-running-sum-of-1d-array
1833-find-the-highest-altitude
1895-minimum-number-of-operations-to-move-all-balls-to-each-box