LeetCode

Solutions to some of the questions on the LeetCode website.

The questions are divided into 3 levels of difficulty:

• Easy
• Medium
• Hard

Solutions

Problem Solution	Problem Statement	Difficulty
LC0001.py	Summary Ranges	Easy
LC0002.py	Majority Element II	Medium
LC0003.py	Equal Row and Column Pairs	Medium
LC0004.py	Minimum Absolute Difference in BST	Easy
LC0004.py	Minimum Distance Between BST Nodes	Easy
LC0005.py	Maximum Level Sum of a Binary Tree	Medium
LC0006.py	Two Sum	Easy
LC0007.py	Number of Ways to Reorder Array to Get Same BST	Hard
LC0008.py	Add two Numbers	Medium
LC0009.py	Make Array Strictly Increasing	Hard
LC0010.py	Longest Substring Without Repeating Characters	Medium
LC0011.py	Number of Increasing Paths in a Grid	Hard
LC0012.py	Find the Highest Altitude	Easy
LC0013.py	K Radius Subarray Averages	Medium
LC0014.py	Median of Two Sorted Arrays	Hard
LC0015.py	Minimum Cost to Make Array Equal	Hard
LC0016.py	Best Time to Buy and Sell Stock with Transaction Fee	Medium
LC0017.py	Longest Arithmetic Subsequence	Medium
LC0018.py	Tallest Billboard	Hard
LC0019.py	Count All Possible Routes	Hard
LC0020.py	Total Cost to Hire K Workers	Medium
LC0021.py	Find K Pairs with Smallest Sums	Medium
LC0022.py	Path with Maximum Probability	Medium
LC0023.py	Shortest Path to Get All Keys	Hard
LC0024.py	Last Day Where You Can Still Cross	Hard
LC0025.py	Fair Distribution of Cookies	Medium
LC0026.py	Maximum Number of Achievable Transfer Requests	Hard
LC0027.py	Buddy Strings	Easy
LC0028.py	Single Number II	Medium
LC0029.py	Longest Subarray of 1's After Deleting One Element	Medium
LC0030.py	Minimum Size Subarray Sum	Medium
LC0031.py	Maximize the Confusion of an Exam	Medium
LC0032.py	Put Marbles in Bags	Hard
LC0033.py	Substring With Largest Variance	Hard
LC0034.py	Minimum Depth of Binary Tree	Easy
LC0035.py	All Nodes Distance K in Binary Tree	Medium
LC0036.py	Find Eventual Safe States	Medium
LC0037.py	Course Schedule	Medium
LC0038.py	Longest Arithmetic Subsequence of Given Difference	Medium
LC0039.py	Maximum Number of Events That Can Be Attended II	Hard
LC0040.py	Smallest Sufficient Team	Hard
LC0041.py	Add Two Numbers II	Medium
LC0042.py	LRU Cache	Medium
LC0043.py	Non-overlapping Intervals	Medium
LC0044.py	Asteroid Collision	Medium
LC0045.py	Number of Longest Increasing Subsequence	Medium
LC0046.py	Longest Increasing Subsequence	Medium
LC0047.py	Knight Probability in Chessboard	Medium
LC0048.py	All Possible Full Binary Trees	Medium
LC0049.py	Pow(x, n)	Medium
LC0050.py	Peak Index in a Mountain Array	Medium
LC0051.py	Minimum Speed to Arrive on Time	Medium
LC0052.py	Maximum Running Time of N Computers	Hard
LC0053.py	Predict the Winner	Medium
LC0054.py	Soup Servings	Medium
LC0055.py	Strange Printer	Hard
LC0056.py	Minimum ASCII Delete Sum for Two Strings	Medium
LC0057.py	Combinations	Medium
LC0058.py	Permutations	Medium
LC0059.py	Letter Combinations of a Phone Number	Medium
LC0060.py	Word Break	Medium
LC0061.py	Unique Binary Search Trees	Medium
LC0062.py	Unique Binary Search Trees II	Medium
LC0063.py	Number of Music Playlists	Hard
LC0064.py	Search a 2D Matrix	Hard
LC0065.py	Search in Rotated Sorted Array	Medium
LC0066.py	Minimize the Maximum Difference of Pairs	Medium
LC0067.py	Search in Rotated Sorted Array II	Medium
LC0068.py	Coin Change II	Medium
LC0069.py	Unique Paths II	Medium
LC0070.py	Check if There is a Valid Partition For The Array	Medium
LC0071.py	Kth Largest Element in an Array	Medium
LC0072.py	Partition List	Medium
LC0073.py	Sliding Window Maximum	Hard
LC0074.py	01 Matrix	Medium
LC0075.py	Maximal Network Rank	Medium
LC0076.py	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	Hard
LC0077.py	Sort Items by Groups Respecting Dependencies	Hard
LC0078.py	Reorganize String	Medium
LC0079.py	Excel Sheet Column Title	Easy
LC0080.py	Repeated Substring Pattern	Easy
LC0081.py	Text Justification	Hard
LC0082.py	Interleaving String	Medium
LC0083.py	Maximum Length of Pair Chain	Medium
LC0084.py	Frog Jump	Hard
LC0085.py	Implement Stack using Queues	Easy
LC0086.py	Minimum Penalty for a Shop	Medium
LC0087.py	Minimum Replacements to Sort the Array	Hard
LC0088.py	Minimum Number of Taps to Open to Water a Garden	Hard
LC0089.py	Counting Bits	Easy
LC0090.py	Extra Characters in a String	Medium
LC0091.py	Unique Paths	Medium
LC0092.py	Linked List Cycle	Easy
LC0093.py	Copy List with Random Pointer	Medium
LC0094.py	Split Linked List in Parts	Medium
LC0095.py	Reverse Linked List II	Medium
LC0096.py	Pascal's Triangle	Easy
LC0097.py	Combination Sum IV	Medium
LC0098.py	Count All Valid Pickup and Delivery Options	Hard
LC0099.py	Group the People Given the Group Size They Belong To	Medium
LC0100.py	Minimum Deletions to Make Character Frequencies Unique	Medium
LC0101.py	Candy	Hard
LC0102.py	Reconstruct Itinerary	Hard
LC0103.py	Min Cost to Connect All Points	Medium
LC0104.py	Path With Minimum Effort	Medium
LC0105.py	Shortest Path Visiting All Nodes	Hard
LC0106.py	The K Weakest Rows in a Matrix	Easy
LC0107.py	Find the Duplicate Number	Medium
LC0108.py	Minimum Operations to Reduce X to Zero	Medium
LC0109.py	Is Subsequence	Easy
LC0110.py	Longest String Chain	Medium
LC0111.py	Champagne Tower	Medium
LC0112.py	Find the Difference	Easy
LC0113.py	Smallest Subsequence of Distinct Characters	Medium
LC0114.py	Remove Duplicate Letters	Medium
LC0115.py	Decoded String at Index	Medium
LC0116.py	Sort Array By Parity	Easy
LC0117.py	Monotonic Array	Easy
LC0118.py	132 Pattern	Medium
LC0119.py	Reverse Words in a String III	Easy
LC0120.py	Remove Colored Pieces if Both Neighbors are the Same Color	Medium
LC0121.py	Keys and Rooms	Medium
LC0122.py	Number of Good Pairs	Easy
LC0123.py	Design HashMap	Easy
LC0124.py	Majority Element II	Medium
LC0125.py	Integer Break	Medium
LC0126.py	Build Array Where You Can Find The Maximum Exactly K Comparisons	Hard
LC0127.py	Max Dot Product of Two Subsequences	Hard
LC0128.py	Find First and Last Position of Element in Sorted Array	Medium
LC0129.py	Minimum Number of Operations to Make Array Continuous	Hard
LC0130.py	Number of Flowers in Full Bloom	Hard
LC0131.py	Find in Mountain Array	Hard
LC0132.py	Min Cost Climbing Stairs	Easy
LC0133.py	Painting the Walls	Hard
LC0134.py	Number of Ways to Stay in the Same Place After Some Steps	Hard
LC0135.py	Pascal's Triangle II	Easy
LC0136.py	Validate Binary Tree Nodes	Medium
LC0137.py	Parallel Courses III	Hard
LC0138.py	Backspace String Compare	Easy
LC0139.py	Flatten Nested List Iterator	Medium
LC0140.py	Constrained Subsequence Sum	Hard
LC0141.py	Maximum Score of a Good Subarray	Hard
LC0142.py	Power of Four	Easy
LC0143.py	Find Largest Value in Each Tree Row	Medium
LC0144.py	K-th Symbol in Grammar	Medium
LC0145.py	Binary Trees With Factors	Medium
LC0146.py	Longest Palindromic Substring	Hard
LC0147.py	Count Vowels Permutation	Hard
LC0148.py	Poor Pigs	Hard
LC0149.py	Sort Integers by The Number of 1 Bits	Easy
LC0150.py	Find The Original Array of Prefix Xor	Medium
LC0151.py	Find Mode in Binary Search Tree	Easy
LC0152.py	Count Nodes Equal to Average of Subtree	Medium
LC0153.py	Build an Array With Stack Operations	Medium
LC0154.py	Last Moment Before All Ants Fall Out of a Plank	Medium
LC0155.py	Find the Winner of an Array Game	Medium
LC0156.py	Seat Reservation Manager	Medium
LC0157.py	Eliminate Maximum Number of Monsters	Medium
LC0158.py	Determine if a Cell Is Reachable at a Given Time	Medium
LC0159.py	Count Number of Homogenous Substrings	Medium
LC0160.py	Restore the Array From Adjacent Pairs	Medium
LC0161.py	Design Graph With Shortest Path Calculator	Hard
LC0162.py	Bus Routes	Hard
LC0163.py	Sort Vowels in a String	Medium
LC0164.py	Unique Length-3 Palindromic Subsequences	Medium
LC0165.py	Maximum Element After Decreasing and Rearranging	Medium
LC0166.py	Find Unique Binary String	Medium
LC0167.py	Minimize Maximum Pair Sum in Array	Medium
LC0168.py	Frequency of the Most Frequent Element	Medium
LC0169.py	Reduction Operations to Make the Array Elements Equal	Medium
LC0170.py	Minimum Amount of Time to Collect Garbage	Medium
LC0171.py	Count Nice Pairs in an Array	Medium
LC0172.py	Diagonal Traverse II	Medium
LC0173.py	Arithmetic Subarrays	Medium
LC0174.py	Maximum Number of Coins You Can Get	Medium
LC0175.py	Sum of Absolute Differences in a Sorted Array	Medium
LC0176.py	Largest Submatrix With Rearrangements	Medium
LC0177.py	Knight Dialer	Medium
LC0178.py	Number of Ways to Divide a Long Corridor	Hard
LC0179.py	Number of 1 Bits	Easy
LC0180.py	Minimum One Bit Operations to Make Integers Zero	Hard
LC0181.py	Check If Two String Arrays are Equivalent	Easy
LC0182.py	Find Words That Can Be Formed by Characters	Easy
LC0183.py	Minimum Time Visiting All Points	Easy
LC0184.py	Largest 3-Same-Digit Number in String	Easy
LC0185.py	Count of Matches in Tournament	Easy
LC0186.py	Calculate Money in Leetcode Bank	Easy
LC0187.py	Largest Odd Number in String	Easy
LC0188.py	Construct String from Binary Tree	Easy
LC0189.py	Binary Tree Inorder Traversal	Easy
LC0190.py	Transpose Matrix	Easy
LC0191.py	Element Appearing More Than 25% In Sorted Array	Easy
LC0192.py	Maximum Product of Two Elements in an Array	Easy
LC0193.py	Special Positions in a Binary Matrix	Easy
LC0194.py	Difference Between Ones and Zeros in Row and Column	Medium
LC0195.py	Destination City	Easy
LC0196.py	Valid Anagram	Easy
LC0197.py	Design a Food Rating System	Medium
LC0198.py	Maximum Product Difference Between Two Pairs	Easy
LC0199.py	Image Smoother	Easy
LC0200.py	Buy Two Chocolates	Easy
LC0201.py	Widest Vertical Area Between Two Points Containing No Points	Medium
LC0202.py	Maximum Score After Splitting a String	Easy
LC0203.py	Path Crossing	Easy
LC0204.py	Minimum Changes To Make Alternating Binary String	Easy
LC0205.py	Decode Ways	Medium
LC0206.py	Number of Dice Rolls With Target Sum	Medium
LC0207.py	Minimum Time to Make Rope Colorful	Medium
LC0208.py	String Compression II	Hard
LC0209.py	Minimum Difficulty of a Job Schedule	Hard
LC0210.py	Redistribute Characters to Make All Strings Equal	Easy
LC0211.py	Optimal Partition of String	Medium
LC0212.py	Largest Substring Between Two Equal Characters	Easy
LC0213.py	Merge Two Sorted Lists	Easy
LC0214.py	Merge k Sorted Lists	Hard
LC0215.py	Assign Cookies	Easy
LC0216.py	Convert an Array Into a 2D Array With Conditions	Medium
LC0217.py	Number of Laser Beams in a Bank	Medium
LC0217.py	Minimum Number of Operations to Make Array Empty	Medium
LC0219.py	Maximum Profit in Job Scheduling	Hard
LC0220.py	Arithmetic Slices II - Subsequence	Hard
LC0221.py	Range Sum of BST	Easy
LC0222.py	Leaf-Similar Trees	Easy
LC0223.py	Amount of Time for Binary Tree to Be Infected	Medium
LC0224.py	Maximum Difference Between Node and Ancestor	Medium
LC0225.py	Determine if String Halves Are Alike	Easy
LC0226.py	Minimum Number of Steps to Make Two Strings Anagram	Medium
LC0227.py	Determine if Two Strings Are Close	Medium
LC0228.py	Find Players With Zero or One Losses	Medium
LC0229.py	Insert Delete GetRandom O(1)	Medium
LC0230.py	Unique Number of Occurrences	Easy
LC0231.py	Climbing Stairs	Easy
LC0232.py	Minimum Falling Path Sum	Medium
LC0233.py	Sum of Subarray Minimums	Medium
LC0234.py	House Robber	Medium
LC0235.py	Set Mismatch	Easy
LC0236.py	Maximum Length of a Concatenated String with Unique Characters	Medium
LC0237.py	Pseudo-Palindromic Paths in a Binary Tree	Medium
LC0238.py	Longest Common Subsequence	Medium
LC0239.py	Out of Boundary Paths	Medium
LC0240.py	K Inverse Pairs Array	Hard
LC0241.py	Number of Submatrices That Sum to Target	Hard
LC0242.py	Implement Queue using Stacks	Hard
LC0243.py	Evaluate Reverse Polish Notation	Medium
LC0244.py	Daily Temperatures	Medium
LC0245.py	Divide Array Into Arrays With Max Difference	Medium
LC0246.py	Sequential Digits	Medium
LC0247.py	Partition Array for Maximum Sum	Medium
LC0248.py	Minimum Window Substring	Hard
LC0249.py	First Unique Character in a String	Easy
LC0250.py	Group Anagrams	Medium
LC0251.py	Sort Characters By Frequency	Medium
LC0252.py	Perfect Squares	Medium
LC0253.py	Largest Divisible Subset	Medium
LC0254.py	Palindromic Substrings	Medium
LC0255.py	Cherry Pickup II	Hard
LC0256.py	Majority Element	Easy
LC0257.py	Find First Palindromic String in the Array	Easy
LC0258.py	Rearrange Array Elements by Sign	Medium
LC0259.py	Find Polygon With the Largest Perimeter	Medium
LC0260.py	Least Number of Unique Integers after K Removals	Medium
LC0261.py	Furthest Building You Can Reach	Medium
LC0262.py	Meeting Rooms III	Hard
LC0263.py	Missing Number	Easy
LC0264.py	Power of Two	Easy
LC0265.py	Bitwise AND of Numbers Range	Medium
LC0266.py	Find the Town Judge	Easy
LC0267.py	Cheapest Flights Within K Stops	Medium
LC0268.py	Find All People With Secret	Hard
LC0269.py	Greatest Common Divisor Traversal	Hard
LC0270.py	Same Tree	Easy
LC0271.py	Diameter of Binary Tree	Easy
LC0272.py	Find Bottom Left Tree Value	Medium
LC0273.py	Even Odd Tree	Medium
LC0274.py	Maximum Odd Binary Number	Easy
LC0275.py	Squares of a Sorted Array	Easy
LC0276.py	Remove Nth Node From End of List	Medium
LC0277.py	Bag of Tokens	Medium
LC0278.py	Minimum Length of String After Deleting Similar Ends	Medium
LC0279.py	Linked List Cycle	Easy
LC0280.py	Middle of the Linked List	Easy
LC0281.py	Count Elements With Maximum Frequency	Easy
LC0282.py	Minimum Common Value	Easy
LC0283.py	Intersection of Two Arrays	Easy
LC0284.py	Custom Sort String	Medium
LC0285.py	Remove Zero Sum Consecutive Nodes from Linked List	Medium
LC0286.py	Find the Pivot Integer	Easy
LC0287.py	Binary Subarrays With Sum	Medium
LC0288.py	Product of Array Except Self	Medium
LC0289.py	Contiguous Array	Medium
LC0290.py	Insert Interval	Medium
LC0291.py	Minimum Number of Arrows to Burst Balloons	Medium
LC0292.py	Task Scheduler	Medium
LC0293.py	Merge In Between Linked Lists	Medium
LC0294.py	Reverse Linked List	Easy
LC0295.py	Palindrome Linked List	Easy
LC0296.py	Reorder List	Medium
LC0297.py	Find All Duplicates in an Array	Medium
LC0298.py	First Missing Positive	Hard
LC0299.py	Subarray Product Less Than K	Medium
LC0300.py	Length of Longest Subarray With at Most K Frequency	Medium
LC0301.py	Count Subarrays Where Max Element Appears at Least K Times	Medium
LC0302.py	Subarrays with K Different Integers	Hard
LC0303.py	Count Subarrays With Fixed Bounds	Hard
LC0304.py	Length of Last Word	Easy
LC0305.py	Isomorphic Strings	Easy
LC0306.py	Word Search	Medium
LC0307.py	Maximum Nesting Depth of the Parentheses	Easy
LC0308.py	Make The String Great	Easy
LC0309.py	Minimum Remove to Make Valid Parentheses	Medium
LC0310.py	Valid Parenthesis String	Medium
LC0311.py	Number of Students Unable to Eat Lunch	Easy
LC0312.py	Time Needed to Buy Tickets	Easy
LC0313.py	Reveal Cards In Increasing Order	Medium
LC0314.py	Remove K Digits	Medium
LC0315.py	Trapping Rain Water	Hard
LC0316.py	Maximal Rectangle	Hard
LC0317.py	Sum of Left Leaves	Easy
LC0318.py	Sum Root to Leaf Numbers	Medium
LC0319.py	Add One Row to Tree	Medium
LC0320.py	Smallest String Starting From Leaf	Medium
LC0321.py	Island Perimeter	Medium
LC0322.py	Number of Islands	Medium
LC0323.py	Find All Groups of Farmland	Medium
LC0324.py	Find if Path Exists in Graph	Easy
LC0325.py	Open the Lock	Medium
LC0326.py	Minimum Height Trees	Medium
LC0327.py	N-th Tribonacci Number	Easy
LC0328.py	Longest Ideal Subsequence	Medium
LC0329.py	Minimum Falling Path Sum II	Hard
LC0330.py	Freedom Trail	Hard
LC0331.py	Sum of Distances in Tree	Hard
LC0332.py	Minimum Number of Operations to Make Array XOR Equal to K	Medium
LC0333.py	Number of Wonderful Substrings	Medium
LC0334.py	Reverse Prefix of Word	Easy
LC0335.py	Largest Positive Integer That Exists With Its Negative	Easy
LC0336.py	Compare Version Numbers	Medium
LC0337.py	Boats to Save People	Medium
LC0338.py	Delete Node in a Linked List	Medium
LC0339.py	Remove Nodes From Linked List	Medium
LC0340.py	Double a Number Represented as a Linked List	Medium
LC0341.py	Relative Ranks	Easy
LC0342.py	Maximize Happiness of Selected Children	Medium
LC0343.py	K-th Smallest Prime Fraction	Medium
LC0344.py	Minimum Cost to Hire K Workers	Hard
LC0345.py	Largest Local Values in a Matrix	Easy
LC0346.py	Score After Flipping Matrix	Medium
LC0347.py	Path with Maximum Gold	Medium
LC0348.py	Find the Safest Path in a Grid	Medium
LC0349.py	Delete Leaves With a Given Value	Medium
LC0350.py	Evaluate Boolean Binary Tree	Easy
LC0351.py	Distribute Coins in Binary Tree	Medium
LC0352.py	Find the Maximum Sum of Node Values	Hard
LC0353.py	Sum of All Subset XOR Totals	Easy
LC0354.py	Subsets	Medium
LC0355.py	Palindrome Partitioning	Medium
LC0356.py	The Number of Beautiful Subsets	Medium
LC0357.py	Maximum Score Words Formed by Letters	Hard
LC0358.py	Word Break II	Hard
LC0359.py	Student Attendance Record II	Hard
LC0360.py	Special Array With X Elements Greater Than or Equal X	Easy
LC0361.py	Get Equal Substrings Within Budget	Medium
LC0362.py	Number of Steps to Reduce a Number in Binary Representation to One	Medium
LC0363.py	Count Triplets That Can Form Two Arrays of Equal XOR	Medium
LC0364.py	Single Number III	Medium
LC0365.py	Score of a String	Easy
LC0366.py	Reverse String	Easy
LC0367.py	Append Characters to String to Make Subsequence	Medium
LC0368.py	Longest Palindrome	Easy
LC0369.py	Find Common Characters	Easy
LC0370.py	Hand of Straights	Medium
LC0371.py	Replace Words	Medium
LC0372.py	Continuous Subarray Sum	Medium
LC0373.py	Subarray Sums Divisible by K	Medium
LC0374.py	Subarray Sums Divisible by K	Medium
LC0375.py	Relative Sort Array	Easy
LC0376.py	Sort Colors	Medium
LC0377.py	Minimum Number of Moves to Seat Everyone	Easy
LC0378.py	Minimum Increment to Make Array Unique	Medium
LC0379.py	IPO	Hard
LC0380.py	Patching Array	Hard
LC0381.py	Sum of Square Numbers	Medium
LC0382.py	Most Profit Assigning Work	Medium
LC0383.py	Minimum Number of Days to Make m Bouquets	Medium
LC0384.py	Palindromic Substrings	Medium
LC0385.py	Magnetic Force Between Two Balls	Medium
LC0386.py	Grumpy Bookstore Owner	Medium
LC0387.py	Count Number of Nice Subarrays	Medium
LC0388.py	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium
LC0389.py	Minimum Number of K Consecutive Bit Flips	Hard
LC0390.py	Binary Search Tree to Greater Sum Tree	Medium
LC0391.py	Balance a Binary Search Tree	Medium
LC0392.py	Find Center of Star Graph	Easy
LC0393.py	Maximum Total Importance of Roads	Medium
LC0394.py	All Ancestors of a Node in a Directed Acyclic Graph	Medium
LC0395.py	Remove Max Number of Edges to Keep Graph Fully Traversable	Hard
LC0396.py	Three Consecutive Odds	Easy
LC0397.py	Intersection of Two Arrays II	Easy
LC0398.py	Minimum Difference Between Largest and Smallest Value in Three Moves	Medium
LC0399.py	Merge Nodes in Between Zeros	Medium
LC0400.py	Find the Minimum and Maximum Number of Nodes Between Critical Points	Medium
LC0401.py	Pass the Pillow	Easy
LC0402.py	Water Bottles	Easy
LC0403.py	Find the Winner of the Circular Game	Medium
LC0404.py	Average Waiting Time	Medium
LC0405.py	Crawler Log Folder	Easy
LC0406.py	Reverse Substrings Between Each Pair of Parentheses	Medium
LC0407.py	Robot Collisions	Hard
LC0408.py	Maximum Score From Removing Substrings	Medium
LC0409.py	Number of Atoms	Hard
LC0410.py	Create Binary Tree From Descriptions	Medium
LC0411.py	Step-By-Step Directions From a Binary Tree Node to Another	Medium
LC0412.py	Delete Nodes And Return Forest	Medium
LC0413.py	Number of Good Leaf Nodes Pairs	Medium
LC0414.py	Lucky Numbers in a Matrix	Easy
LC0415.py	Find Valid Matrix Given Row and Column Sums	Medium
LC0416.py	Build a Matrix With Conditions	Medium
LC0417.py	Sort the People	Easy
LC0418.py	Sort Array by Increasing Frequency	Easy
LC0419.py	Sort the Jumbled Numbers	Medium
LC0420.py	Sort an Array	Medium
LC0421.py	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium
LC0422.py	Minimum Cost to Convert String I	Medium
LC0423.py	Second Minimum Time to Reach Destination	Hard
LC0424.py	Count Number of Teams	Medium
LC0425.py	Minimum Deletions to Make String Balanced	Medium
LC0426.py	Filling Bookcase Shelves	Medium
LC0427.py	Number of Senior Citizens	Easy
LC0428.py	Minimum Swaps to Group All 1's Together II	Medium
LC0429.py	Make Two Arrays Equal by Reversing Subarrays	Easy
LC0430.py	Range Sum of Sorted Subarray Sums	Medium
LC0431.py	Kth Distinct String in an Array	Easy
LC0432.py	Minimum Number of Pushes to Type Word II	Medium
LC0433.py	Integer to English Words	Hard
LC0434.py	Spiral Matrix III	Medium
LC0435.py	Magic Squares In Grid	Medium
LC0436.py	Regions Cut By Slashes	Medium
LC0437.py	Minimum Number of Days to Disconnect Island	Hard
LC0438.py	Kth Largest Element in a Stream	Easy
LC0439.py	Combination Sum II	Medium
LC0440.py	Find K-th Smallest Pair Distance	Hard
LC0441.py	Lemonade Change	Easy
LC0442.py	Maximum Distance in Arrays	Medium
LC0443.py	Maximum Number of Points with Cost	Medium
LC0444.py	Ugly Number II	Medium
LC0445.py	2 Keys Keyboard	Medium
LC0446.py	Stone Game II	Medium
LC0447.py	Strange Printer	Hard
LC0448.py	Number Complement	Easy
LC0449.py	Fraction Addition and Subtraction	Medium
LC0450.py	Find the Closest Palindrome	Hard
LC0451.py	Binary Tree Postorder Traversal	Easy
LC0452.py	N-ary Tree Postorder Traversal	Easy
LC0453.py	Path with Maximum Probability	Medium
LC0454.py	Count Sub Islands	Medium
LC0455.py	Most Stones Removed with Same Row or Column	Medium
LC0456.py	Modify Graph Edge Weights	Hard
LC0457.py	Convert 1D Array Into 2D Array	Easy
LC0458.py	Find the Student that Will Replace the Chalk	Medium
LC0459.py	Sum of Digits of String After Convert	Easy
LC0460.py	Walking Robot Simulation	Medium
LC0461.py	Find Missing Observations	Medium
LC0462.py	Delete Nodes From Linked List Present in Array	Medium
LC0463.py	Linked List in Binary Tree	Medium
LC0464.py	Split Linked List in Parts	Medium
LC0465.py	Spiral Matrix IV	Medium
LC0466.py	Insert Greatest Common Divisors in Linked List	Medium
LC0467.py	Minimum Bit Flips to Convert Number	Easy
LC0468.py	Count the Number of Consistent Strings	Easy
LC0469.py	XOR Queries of a Subarray	Medium
LC0470.py	Longest Subarray With Maximum Bitwise AND	Medium
LC0471.py	Find the Longest Substring Containing Vowels in Even Counts	Medium
LC0472.py	Minimum Time Difference	Medium
LC0473.py	Uncommon Words from Two Sentences	Easy
LC0474.py	Largest Number	Medium
LC0475.py	Different Ways to Add Parentheses	Medium
LC0476.py	Shortest Palindrome	Hard
LC0477.py	Lexicographical Numbers	Medium
LC0478.py	K-th Smallest in Lexicographical Order	Hard
LC0479.py	Extra Characters in a String	Medium
LC0480.py	Find the Length of the Longest Common Prefix	Medium
LC0481.py	Sum of Prefix Scores of Strings	Hard
LC0482.py	My Calendar I	Medium
LC0483.py	My Calendar II	Medium
LC0484.py	Design Circular Deque	Medium
LC0485.py	All O`one Data Structure	Hard
LC0486.py	Design a Stack With Increment Operation	Medium
LC0487.py	Check If Array Pairs Are Divisible by k	Medium
LC0488.py	Rank Transform of an Array	Easy
LC0489.py	Make Sum Divisible by P	Medium
LC0490.py	Divide Players Into Teams of Equal Skill	Medium
LC0491.py	Permutation in String	Medium
LC0492.py	Sentence Similarity III	Medium
LC0493.py	Minimum String Length After Removing Substrings	Easy
LC0494.py	Minimum Number of Swaps to Make the String Balanced	Medium
LC0495.py	Minimum Add to Make Parentheses Valid	Medium
LC0496.py	Maximum Width Ramp	Medium
LC0497.py	The Number of the Smallest Unoccupied Chair	Medium
LC0498.py	Divide Intervals Into Minimum Number of Groups	Medium
LC0499.py	Smallest Range Covering Elements from K Lists	Hard
LC0500.py	Maximal Score After Applying K Operations	Medium
LC0501.py	Separate Black and White Balls	Medium
LC0502.py	Longest Happy String	Medium
LC0503.py	Maximum Swap	Medium
LC0504.py	Count Number of Maximum Bitwise-OR Subsets	Medium
LC0505.py	Find Kth Bit in Nth Binary String	Medium
LC0506.py	Parsing A Boolean Expression	Hard
LC0507.py	Split a String Into the Max Number of Unique Substrings	Medium
LC0508.py	Kth Largest Sum in a Binary Tree	Medium
LC0509.py	Cousins in Binary Tree II	Medium
LC0510.py	Flip Equivalent Binary Trees	Medium
LC0511.py	Remove Sub-Folders from the Filesystem	Medium
LC0512.py	Height of Binary Tree After Subtree Removal Queries	Hard
LC0513.py	Count Square Submatrices with All Ones	Medium
LC0514.py	Longest Square Streak in an Array	Medium
LC0515.py	Maximum Number of Moves in a Grid	Medium
LC0516.py	Minimum Number of Removals to Make Mountain Array	Hard
LC0517.py	Minimum Total Distance Traveled	Hard
LC0518.py	Delete Characters to Make Fancy String	Easy
LC0519.py	Circular Sentence	Easy
LC0520.py	Rotate String	Easy
LC0521.py	String Compression III	Medium
LC0522.py	Minimum Number of Changes to Make Binary String Beautiful	Medium
LC0523.py	Find if Array Can Be Sorted	Medium
LC0524.py	Largest Combination With Bitwise AND Greater Than Zero	Medium
LC0525.py	Maximum XOR for Each Query	Medium
LC0526.py	Minimum Array End	Medium
LC0527.py	Shortest Subarray With OR at Least K II	Medium
LC0528.py	Prime Subtraction Operation	Medium