Be aware that some LC numbers are wrong. For example 994 Rotting Oranges is here collected as 1036.

LeetCode Topics

Tree

0653-two-sum-iv-input-is-a-bst
2384-root-equals-sum-of-children

Binary Tree

0653-two-sum-iv-input-is-a-bst
2384-root-equals-sum-of-children

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0011-container-with-most-water
0015-3sum
0074-search-a-2d-matrix
0139-word-break
0150-evaluate-reverse-polish-notation
0167-two-sum-ii-input-array-is-sorted
0739-daily-temperatures
0792-binary-search
0907-koko-eating-bananas
1036-rotting-oranges
1603-running-sum-of-1d-array
1791-richest-customer-wealth
3788-maximum-unique-subarray-sum-after-deletion

Prefix Sum

1603-running-sum-of-1d-array

Matrix

0074-search-a-2d-matrix
1036-rotting-oranges
1791-richest-customer-wealth

Math

0002-add-two-numbers
0150-evaluate-reverse-polish-notation
0202-happy-number
0263-ugly-number
0412-fizz-buzz
1444-number-of-steps-to-reduce-a-number-to-zero

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0008-string-to-integer-atoi
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0022-generate-parentheses
0125-valid-palindrome
0139-word-break
0383-ransom-note
0412-fizz-buzz
1818-maximum-score-from-removing-substrings

Simulation

0412-fizz-buzz

Bit Manipulation

1444-number-of-steps-to-reduce-a-number-to-zero

Linked List

0002-add-two-numbers
0021-merge-two-sorted-lists
0023-merge-k-sorted-lists
0141-linked-list-cycle
0146-lru-cache
0908-middle-of-the-linked-list

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0015-3sum
0125-valid-palindrome
0141-linked-list-cycle
0167-two-sum-ii-input-array-is-sorted
0202-happy-number
0653-two-sum-iv-input-is-a-bst
0908-middle-of-the-linked-list

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0017-letter-combinations-of-a-phone-number
0133-clone-graph
0139-word-break
0141-linked-list-cycle
0146-lru-cache
0202-happy-number
0383-ransom-note
0653-two-sum-iv-input-is-a-bst
3788-maximum-unique-subarray-sum-after-deletion

Counting

0383-ransom-note

Depth-First Search

0133-clone-graph
0310-minimum-height-trees
0653-two-sum-iv-input-is-a-bst

Breadth-First Search

0133-clone-graph
0310-minimum-height-trees
0653-two-sum-iv-input-is-a-bst
1036-rotting-oranges

Binary Search Tree

0004-median-of-two-sorted-arrays
0074-search-a-2d-matrix
0167-two-sum-ii-input-array-is-sorted
0653-two-sum-iv-input-is-a-bst
0792-binary-search
0907-koko-eating-bananas

Graph

0133-clone-graph
0310-minimum-height-trees

Topological Sort

0310-minimum-height-trees

Trie

0014-longest-common-prefix
0139-word-break

Divide and Conquer

0004-median-of-two-sorted-arrays
0023-merge-k-sorted-lists

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists

Sliding Window

0003-longest-substring-without-repeating-characters

Dynamic Programming

0005-longest-palindromic-substring
0022-generate-parentheses
0139-word-break

Sorting

0015-3sum

Greedy

0011-container-with-most-water
1818-maximum-score-from-removing-substrings
3788-maximum-unique-subarray-sum-after-deletion

Stack

0020-valid-parentheses
0150-evaluate-reverse-polish-notation
0155-min-stack
0739-daily-temperatures
1818-maximum-score-from-removing-substrings

Memoization

0139-word-break

Backtracking

0017-letter-combinations-of-a-phone-number
0022-generate-parentheses

Design

0146-lru-cache
0155-min-stack

Doubly-Linked List

0146-lru-cache

Heap (Priority Queue)

0023-merge-k-sorted-lists

Merge Sort

0023-merge-k-sorted-lists

Monotonic Stack

0739-daily-temperatures