leetcode

Collection of LeetCode questions to ace the coding interview! - Created using LeetHub

LeetCode Topics

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0141-linked-list-cycle
0143-reorder-list
0167-two-sum-ii-input-array-is-sorted
0287-find-the-duplicate-number
1002-maximum-width-ramp
1790-lowest-common-ancestor-of-a-binary-tree-iii

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0079-word-search
0139-word-break
0179-largest-number
0227-basic-calculator-ii
0271-encode-and-decode-strings
0424-longest-repeating-character-replacement
1371-minimum-remove-to-make-valid-parentheses

Dynamic Programming

0005-longest-palindromic-substring
0022-generate-parentheses
0139-word-break
0152-maximum-product-subarray
0213-house-robber-ii
0300-longest-increasing-subsequence
0322-coin-change

Array

0011-container-with-most-water
0033-search-in-rotated-sorted-array
0036-valid-sudoku
0039-combination-sum
0046-permutations
0048-rotate-image
0074-search-a-2d-matrix
0078-subsets
0079-word-search
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0128-longest-consecutive-sequence
0139-word-break
0150-evaluate-reverse-polish-notation
0152-maximum-product-subarray
0167-two-sum-ii-input-array-is-sorted
0179-largest-number
0200-number-of-islands
0213-house-robber-ii
0238-product-of-array-except-self
0271-encode-and-decode-strings
0287-find-the-duplicate-number
0300-longest-increasing-subsequence
0322-coin-change
0347-top-k-frequent-elements
0739-daily-temperatures
0792-binary-search
0883-car-fleet
1002-maximum-width-ramp

Backtracking

0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0039-combination-sum
0046-permutations
0078-subsets
0079-word-search

Hash Table

0003-longest-substring-without-repeating-characters
0017-letter-combinations-of-a-phone-number
0036-valid-sudoku
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0128-longest-consecutive-sequence
0138-copy-list-with-random-pointer
0139-word-break
0141-linked-list-cycle
0314-binary-tree-vertical-order-traversal
0347-top-k-frequent-elements
0424-longest-repeating-character-replacement
1790-lowest-common-ancestor-of-a-binary-tree-iii

Sliding Window

0003-longest-substring-without-repeating-characters
0424-longest-repeating-character-replacement

Breadth-First Search

0100-same-tree
0104-maximum-depth-of-binary-tree
0200-number-of-islands
0207-course-schedule
0314-binary-tree-vertical-order-traversal
0322-coin-change
0339-nested-list-weight-sum

Binary Search

0033-search-in-rotated-sorted-array
0074-search-a-2d-matrix
0167-two-sum-ii-input-array-is-sorted
0287-find-the-duplicate-number
0300-longest-increasing-subsequence
0792-binary-search

Linked List

0002-add-two-numbers
0021-merge-two-sorted-lists
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0143-reorder-list
0206-reverse-linked-list

Math

0002-add-two-numbers
0007-reverse-integer
0048-rotate-image
0050-powx-n
0150-evaluate-reverse-polish-notation
0227-basic-calculator-ii

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0050-powx-n
0143-reorder-list
0206-reverse-linked-list

Depth-First Search

0079-word-search
0098-validate-binary-search-tree
0100-same-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0200-number-of-islands
0207-course-schedule
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0314-binary-tree-vertical-order-traversal
0339-nested-list-weight-sum
0572-subtree-of-another-tree

Graph

0207-course-schedule

Topological Sort

0207-course-schedule

Matrix

0036-valid-sudoku
0048-rotate-image
0074-search-a-2d-matrix
0079-word-search
0200-number-of-islands

Greedy

0011-container-with-most-water
0179-largest-number

Union Find

0128-longest-consecutive-sequence
0200-number-of-islands

Trie

0139-word-break

Memoization

0139-word-break

Bit Manipulation

0078-subsets
0287-find-the-duplicate-number

Tree

0098-validate-binary-search-tree
0100-same-tree
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0110-balanced-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0314-binary-tree-vertical-order-traversal
0572-subtree-of-another-tree
1790-lowest-common-ancestor-of-a-binary-tree-iii

Sorting

0179-largest-number
0314-binary-tree-vertical-order-traversal
0347-top-k-frequent-elements
0883-car-fleet

Binary Tree

0098-validate-binary-search-tree
0100-same-tree
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0110-balanced-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0314-binary-tree-vertical-order-traversal
0572-subtree-of-another-tree
1790-lowest-common-ancestor-of-a-binary-tree-iii

Stack

0143-reorder-list
0150-evaluate-reverse-polish-notation
0155-min-stack
0227-basic-calculator-ii
0739-daily-temperatures
0883-car-fleet
1002-maximum-width-ramp
1371-minimum-remove-to-make-valid-parentheses

Monotonic Stack

0739-daily-temperatures
0883-car-fleet
1002-maximum-width-ramp

Divide and Conquer

0105-construct-binary-tree-from-preorder-and-inorder-traversal
0347-top-k-frequent-elements

Heap (Priority Queue)

0347-top-k-frequent-elements

Bucket Sort

0347-top-k-frequent-elements

Counting

0347-top-k-frequent-elements

Quickselect

0347-top-k-frequent-elements

Prefix Sum

0238-product-of-array-except-self

Design

0155-min-stack
0271-encode-and-decode-strings

String Matching

0572-subtree-of-another-tree

Hash Function

0572-subtree-of-another-tree

Binary Search Tree

0098-validate-binary-search-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree