Solutions

Best Team with no Conflicts Medium Longest String Chain Medium Knight Dialer Medium Partition Array for Maximum Sum Medium Largest Divisible Subset Medium Stone Game III Hard Concatenated Words Hard Maximize Score after N Operations Hard Find the Longest Valid Obstacle Course at Each Position Hard Minimum Number of Removals to Make Mountain Array Hard Count all Valid Pickup and Delivery Options Hard Number of Ways to Divide a Long Corridor Hard Maximum Sum of 3 Non-Overlapping Subarrays Hard Maximum Profit in Job Scheduling Hard Student Attendance Record II Hard

2-D Dynamic Programming

Unique Paths Medium Unique Paths II Medium Minimum Path Sum Medium Maximum Number of Points with Cost Medium Longest Common Subsequence Medium Longest Palindromic Subsequence Medium Length of Longest Fibonacci Subsequence Medium Last Stone Weight II Medium Best Time to Buy And Sell Stock With Cooldown Medium Coin Change II Medium Target Sum Medium Interleaving String Medium Stone Game Medium Stone Game II Medium Longest Increasing Path In a Matrix Hard Maximal Square Medium Count Square Submatrices with All Ones Medium Ones and Zeroes Medium 2 Keys Keyboard Medium Maximum Alternating Subsequence Sum Medium Distinct Subsequences Hard Edit Distance Medium Number of Dice Rolls with Target Sum Medium Minimum Falling Path Sum Medium Out of Boundary Paths Medium Longest Ideal Subsequence Medium Count Number of Teams Medium Shortest Common Supersequence Hard Count Vowels Permutation Hard Burst Balloons Hard Number of Ways to Rearrange Sticks With K Sticks Visible Hard Regular Expression Matching Hard Flip String to Monotone Increasing Medium Maximum Value of K Coins from Piles Hard Number of Music Playlists Hard Number of Ways to Form a Target String Given a Dictionary Hard Profitable Schemes Hard Minimum Cost to Cut a Stick Hard Painting the Walls Hard Number of Ways to Stay in the Same Place After Some Steps Hard String Compression II Hard Minimum Difficulty of a Job Schedule Hard Arithmetic Slices II Hard K Inverse Pairs Array Hard Cherry Pickup II Hard Minimum Falling Path Sum II Hard Freedom Trail Hard

Greedy

Buy Two Chocolates Easy Lemonade Change Easy Minimum Number of Moves to Seat Everyone Easy Maximum Odd Binary Number Easy Maximum Nesting Depth of the Parentheses Easy Check if One String Swap Can Make Strings Equal Easy Minimum Operations to Make Binary Array Elements Equal to One I Medium Buildings With an Ocean View Medium Minimum Length of String After Operations Medium Construct K Palindrome Strings Medium Separate Black and White Balls Medium Minimum Increment to Make Array Unique Medium Maximum Subarray Medium Maximum Absolute Sum of Any Subarray Medium Maximum Sum Circular Subarray Medium Minimum Swaps to Group All 1's Together II Medium Longest Turbulent Subarray Medium Jump Game Medium Jump Game II Medium Jump Game VII Medium Gas Station Medium Hand of Straights Medium Minimum Number of Changes to Make Binary String Beautiful Medium Minimize Maximum of Array Medium Minimum Difference Between Largest and Smallest Value in Three Moves Medium Maximum Total Importance of Roads Medium Minimum Number of Pushes to Type Word II Medium Dota2 Senate Medium Maximum Points You Can Obtain From Cards Medium Merge Triplets to Form Target Triplet Medium Partition Labels Medium Valid Parenthesis String Medium Check if a Parentheses String Can Be Valid Medium Eliminate Maximum Number of Monsters Medium Two City Scheduling Medium Maximum Length of Pair Chain Medium Best Sightseeing Pair Medium Make Lexicographically Smallest Array by Swapping Elements Medium Minimum Deletions to Make Character Frequencies Unique Medium Minimum Deletions to Make String Balanced Medium Candy Hard Remove Colored Pieces if Both Neighbors are the Same Color Medium Maximum Score From Removing Substrings Medium Maximum Element After Decreasing and Rearranging Medium Number of Laser Beams in a Bank Medium Reveal Cards In Increasing Order Medium Construct String With Repeat Limit Medium Find Valid Matrix Given Row and Column Sums Medium Score After Flipping Matrix Medium Flip Columns For Maximum Number of Equal Rows Medium Maximum Matrix Sum Medium Make Two Arrays Equal by Reversing Subarrays Easy Shortest Subarray to be Removed to Make Array Sorted Medium Max Chunks To Make Sorted Medium Maximum Swap Medium Maximal Score After Applying K Operations Medium Put Marbles in Bags Hard Minimum Number of K Consecutive Bit Flips Hard Maximum Score of a Good Subarray Hard Find the Maximum Sum of Node Values Hard Minimum Number of Increments on Subarrays to Form a Target Array Hard Apply Operations to Maximize Score Hard

Intervals

Insert Interval Medium Merge Intervals Medium Non Overlapping Intervals Medium Meeting Rooms Easy Meeting Rooms II Medium Meeting Rooms III Hard Divide Intervals Into Minimum Number of Groups Medium Remove Covered Intervals Medium Minimum Number of Arrows to Burst Balloons Medium The Number of the Smallest Unoccupied Chair Medium Check if Grid can be Cut into Sections Medium My Calendar I Medium My Calendar II Medium Count Days Without Meetings Medium Minimum Interval to Include Each Query Hard Data Stream as Disjoint Intervals Hard

Math & Geometry

Excel Sheet Column Title Easy Greatest Common Divisor of Strings Easy Insert Greatest Common Divisors in Linked List Medium Count Odd Numbers in an Interval Range Easy Matrix Diagonal Sum Easy Calculate Money in Leetcode Bank Easy Largest Odd Number in String Easy Transpose Matrix Easy Image Smoother Easy Count of Matches in Tournament Easy Water Bottles Easy Largest Local Values in a Matrix Easy Power of Four Easy Lucky Numbers in a Matrix Easy Maximum Points on a Line Hard Magic Squares In Grid Medium Rotate Image Medium Spiral Matrix Medium Spiral Matrix II Medium Spiral Matrix III Medium Spiral Matrix IV Medium Set Matrix Zeroes Medium Happy Number Easy Plus One Easy Palindrome Number Easy Ugly Number Easy Convert 1D Array Into 2D Array Easy Shift 2D Grid Easy Roman to Integer Easy Integer to Roman Medium Pow(x, n) Medium Find the Punishment Number of an Integer Medium Check if Number is a Sum of Powers of Three Medium Multiply Strings Medium Detect Squares Medium Robot Bounded In Circle Medium Walking Robot Simulation Medium Zigzag Conversion Medium Rotating the Box Medium Sum of Square Numbers Medium Find Missing Observations Medium Minimum Time Difference Medium Minimum Operations to Make a Uni-Value Grid Medium Largest Submatrix With Rearrangements Medium Wildest Vertical Area Between Two Points Containing No Points Easy Tuple with Same Product Medium Lexicographical Numbers Medium Find the Winner of the Circular Game Medium Count Total Number of Colored Cells Medium Prime Subtraction Operation Medium Closest Prime Numbers in Range Medium Minimum Number of One Bit Operations to Make Integers Zero Hard K-th Smallest in Lexicographical Order Hard Integer to English Words Hard

Bit Manipulation

Single Number Easy

1014. Best Sightseeing Pair - Explanation

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