Longest Substring Without Repeating Characters

longest-substring-without-repeating-characters

Valid Parentheses

valid-parentheses

Divide Two Integers

divide-two-integers

Group Anagrams

group-anagrams

Jump Game

jump-game

Gas Station

gas-station

LRU Cache

lru-cache

Integer to English Words

integer-to-english-words

Longest Increasing Subsequence

longest-increasing-subsequence

Remove Duplicate Letters

remove-duplicate-letters

Decode String

decode-string

Degree of an Array

degree-of-an-array

Asteroid Collision

asteroid-collision

Maximum Number of Events That Can Be Attended II

maximum-number-of-events-that-can-be-attended-ii

Minimize Maximum of Array

minimize-maximum-of-array

Maximum Number of Non-overlapping Palindrome Substrings

maximum-number-of-non-overlapping-palindrome-substrings

Count the Number of Good Subsequences

count-the-number-of-good-subsequences

Two Sum

two-sum

Add Two Numbers

add-two-numbers

Longest Palindromic Substring

longest-palindromic-substring

Reverse Integer

reverse-integer

Container With Most Water

container-with-most-water

Integer to Roman

integer-to-roman

Roman to Integer

roman-to-integer

Generate Parentheses

generate-parentheses

Search in Rotated Sorted Array

search-in-rotated-sorted-array

Valid Sudoku

valid-sudoku

Trapping Rain Water

trapping-rain-water

Merge Intervals

merge-intervals

Minimum Window Substring

minimum-window-substring

Restore IP Addresses

restore-ip-addresses

Best Time to Buy and Sell Stock

best-time-to-buy-and-sell-stock

Compare Version Numbers

compare-version-numbers

Second Highest Salary

second-highest-salary

Delete Duplicate Emails

delete-duplicate-emails

Number of Islands

number-of-islands

Reverse Linked List

reverse-linked-list

Invert Binary Tree

invert-binary-tree

Move Zeroes

move-zeroes

Insert Delete GetRandom O(1)

insert-delete-getrandom-o1

First Unique Character in a String

first-unique-character-in-a-string

Minimum Moves to Equal Array Elements

minimum-moves-to-equal-array-elements

Number of Distinct Islands

number-of-distinct-islands

Middle of the Linked List

middle-of-the-linked-list

Remove All Adjacent Duplicates In String

remove-all-adjacent-duplicates-in-string

Count Subarrays With Fixed Bounds

count-subarrays-with-fixed-bounds

Median of Two Sorted Arrays

median-of-two-sorted-arrays

Longest Common Prefix

longest-common-prefix

3Sum

3sum

3Sum Closest

3sum-closest

Letter Combinations of a Phone Number

letter-combinations-of-a-phone-number

Remove Nth Node From End of List

remove-nth-node-from-end-of-list

Merge Two Sorted Lists

merge-two-sorted-lists

Merge k Sorted Lists

merge-k-sorted-lists

Swap Nodes in Pairs

swap-nodes-in-pairs

Reverse Nodes in k-Group

reverse-nodes-in-k-group

Remove Duplicates from Sorted Array

remove-duplicates-from-sorted-array

Substring with Concatenation of All Words

substring-with-concatenation-of-all-words

Next Permutation

next-permutation

Longest Valid Parentheses

longest-valid-parentheses

Find First and Last Position of Element in Sorted Array

find-first-and-last-position-of-element-in-sorted-array

Sudoku Solver

sudoku-solver

Combination Sum

combination-sum

Combination Sum II

combination-sum-ii

First Missing Positive

first-missing-positive

Jump Game II

jump-game-ii

Permutations

permutations

Permutations II

permutations-ii

Rotate Image

rotate-image

Pow(x, n)

powx-n

Maximum Subarray

maximum-subarray

Spiral Matrix

spiral-matrix

Spiral Matrix II

spiral-matrix-ii

Rotate List

rotate-list

Unique Paths

unique-paths

Unique Paths II

unique-paths-ii

Minimum Path Sum

minimum-path-sum

Text Justification

text-justification

Climbing Stairs

climbing-stairs

Simplify Path

simplify-path

Set Matrix Zeroes

set-matrix-zeroes

Search a 2D Matrix

search-a-2d-matrix

Subsets

subsets

Word Search

word-search

Merge Sorted Array

merge-sorted-array

Binary Tree Inorder Traversal

binary-tree-inorder-traversal

Validate Binary Search Tree

validate-binary-search-tree

Same Tree

same-tree

Binary Tree Level Order Traversal

binary-tree-level-order-traversal

Binary Tree Zigzag Level Order Traversal

binary-tree-zigzag-level-order-traversal

Convert Sorted Array to Binary Search Tree

convert-sorted-array-to-binary-search-tree

Path Sum

path-sum

Path Sum II

path-sum-ii

Populating Next Right Pointers in Each Node

populating-next-right-pointers-in-each-node

Pascal's Triangle

pascals-triangle

Best Time to Buy and Sell Stock II

best-time-to-buy-and-sell-stock-ii

Best Time to Buy and Sell Stock III

best-time-to-buy-and-sell-stock-iii

Binary Tree Maximum Path Sum

binary-tree-maximum-path-sum

Valid Palindrome

valid-palindrome

Word Ladder II

word-ladder-ii

Word Ladder

word-ladder

Oracle

#	Title	Difficulty	Frequency
3	Longest Substring Without Repeating Characters	Medium	0.89
20	Valid Parentheses	Easy	0.37
29	Divide Two Integers	Medium	2.58
49	Group Anagrams	Medium	0.84
55	Jump Game	Medium	1.01
134	Gas Station	Medium	2.38
146	LRU Cache	Medium	4.65
273	Integer to English Words	Hard	17.06
300	Longest Increasing Subsequence	Medium	5.52
316	Remove Duplicate Letters	Medium	11.25
394	Decode String	Medium	3.79
697	Degree of an Array	Easy	16.03
735	Asteroid Collision	Medium	2.36
1751	Maximum Number of Events That Can Be Attended II	Hard	48.55
2439	Minimize Maximum of Array	Medium	36.40
2472	Maximum Number of Non-overlapping Palindrome Substrings	Hard	74.08
2539	Count the Number of Good Subsequences	Medium	99.60