Leetcode-Problems

LeetCode Topics

Tree

0094-binary-tree-inorder-traversal
0100-same-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0236-lowest-common-ancestor-of-a-binary-tree
0543-diameter-of-binary-tree
0662-maximum-width-of-binary-tree
0783-search-in-a-binary-search-tree

Breadth-First Search

0100-same-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0130-surrounded-regions
0200-number-of-islands
0662-maximum-width-of-binary-tree
1036-rotting-oranges

Binary Tree

0094-binary-tree-inorder-traversal
0100-same-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0236-lowest-common-ancestor-of-a-binary-tree
0543-diameter-of-binary-tree
0662-maximum-width-of-binary-tree
0783-search-in-a-binary-search-tree

Array

0001-two-sum
0015-3sum
0033-search-in-rotated-sorted-array
0039-combination-sum
0040-combination-sum-ii
0046-permutations
0048-rotate-image
0053-maximum-subarray
0074-search-a-2d-matrix
0075-sort-colors
0079-word-search
0088-merge-sorted-array
0090-subsets-ii
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0128-longest-consecutive-sequence
0130-surrounded-regions
0169-majority-element
0189-rotate-array
0200-number-of-islands
0209-minimum-size-subarray-sum
0215-kth-largest-element-in-an-array
0229-majority-element-ii
0268-missing-number
0283-move-zeroes
0287-find-the-duplicate-number
0303-range-sum-query-immutable
0485-max-consecutive-ones
0496-next-greater-element-i
0525-contiguous-array
0540-single-element-in-a-sorted-array
0560-subarray-sum-equals-k
0643-maximum-average-subarray-i
0739-daily-temperatures
1036-rotting-oranges

Depth-First Search

0079-word-search
0094-binary-tree-inorder-traversal
0100-same-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0124-binary-tree-maximum-path-sum
0130-surrounded-regions
0144-binary-tree-preorder-traversal
0200-number-of-islands
0236-lowest-common-ancestor-of-a-binary-tree
0543-diameter-of-binary-tree
0662-maximum-width-of-binary-tree

Union Find

0128-longest-consecutive-sequence
0130-surrounded-regions
0200-number-of-islands

Matrix

0048-rotate-image
0074-search-a-2d-matrix
0079-word-search
0130-surrounded-regions
0200-number-of-islands
1036-rotting-oranges

Design

0303-range-sum-query-immutable

Prefix Sum

0209-minimum-size-subarray-sum
0303-range-sum-query-immutable
0525-contiguous-array
0560-subarray-sum-equals-k

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0128-longest-consecutive-sequence
0142-linked-list-cycle-ii
0160-intersection-of-two-linked-lists
0169-majority-element
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0496-next-greater-element-i
0525-contiguous-array
0560-subarray-sum-equals-k

Stack

0094-binary-tree-inorder-traversal
0144-binary-tree-preorder-traversal
0234-palindrome-linked-list
0496-next-greater-element-i
0739-daily-temperatures

Monotonic Stack

0496-next-greater-element-i
0739-daily-temperatures

Divide and Conquer

0053-maximum-subarray
0169-majority-element
0215-kth-largest-element-in-an-array

Dynamic Programming

0005-longest-palindromic-substring
0053-maximum-subarray
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0124-binary-tree-maximum-path-sum
0131-palindrome-partitioning

Two Pointers

0005-longest-palindromic-substring
0015-3sum
0019-remove-nth-node-from-end-of-list
0028-find-the-index-of-the-first-occurrence-in-a-string
0061-rotate-list
0075-sort-colors
0088-merge-sorted-array
0142-linked-list-cycle-ii
0160-intersection-of-two-linked-lists
0189-rotate-array
0234-palindrome-linked-list
0283-move-zeroes
0287-find-the-duplicate-number
0908-middle-of-the-linked-list

Sorting

0015-3sum
0075-sort-colors
0088-merge-sorted-array
0169-majority-element
0215-kth-largest-element-in-an-array
0229-majority-element-ii
0242-valid-anagram
0268-missing-number

Math

0002-add-two-numbers
0048-rotate-image
0189-rotate-array
0268-missing-number

Binary Search

0033-search-in-rotated-sorted-array
0074-search-a-2d-matrix
0209-minimum-size-subarray-sum
0268-missing-number
0287-find-the-duplicate-number
0540-single-element-in-a-sorted-array

Bit Manipulation

0090-subsets-ii
0268-missing-number
0287-find-the-duplicate-number

Counting

0169-majority-element
0229-majority-element-ii

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0014-longest-common-prefix
0028-find-the-index-of-the-first-occurrence-in-a-string
0079-word-search
0131-palindrome-partitioning
0242-valid-anagram

Sliding Window

0003-longest-substring-without-repeating-characters
0209-minimum-size-subarray-sum
0643-maximum-average-subarray-i

Trie

0014-longest-common-prefix

Heap (Priority Queue)

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

Quickselect

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

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0061-rotate-list
0142-linked-list-cycle-ii
0160-intersection-of-two-linked-lists
0206-reverse-linked-list
0234-palindrome-linked-list
0237-delete-node-in-a-linked-list
0908-middle-of-the-linked-list

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0206-reverse-linked-list
0234-palindrome-linked-list

Backtracking

0039-combination-sum
0040-combination-sum-ii
0046-permutations
0079-word-search
0090-subsets-ii
0131-palindrome-partitioning

Database

0185-department-top-three-salaries

Binary Search Tree

0783-search-in-a-binary-search-tree

String Matching

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