LeetCode Problems

DAA Problems

• Non-overlapping Intervals

Two Pointer Pattern

• Two Sum II – Input Array Is Sorted

• Remove Duplicates from Sorted Array

• Merge Sorted Array

• Squares of a Sorted Array

• 3Sum

• 3Sum Closest

• Triplets with Smaller Sum

• Segregate 0s and 1s

• Dutch National Flag algorithm

Sliding Window

• Max Sum Subarray of size K

• Min Size Subarray Sum

• Longest Substring with K Uniques

• Fruits Into Baskets

• Longest Substring Without Repeating Characters

• Longest Repeating Character Replacement

• Max Consecutive Ones III

• Minimum Window Substring

• Minimum Removals to Balance Array

• Minimum Number of Flips to Make the Binary String Alternating

• Minimum Absolute Difference in Sliding Submatrix

Fast and Slow Pointer

• Linked list cycle

• Linked list cycle II

• Middle of the Linked List

• Find the Duplicate Number

• Happy Number

Dynamic Programming

• Trapping Rain Water

• Champagne Tower

• Fibonacci Number

• N-th Tribonacci Number

• Min Cost Climbing Stairs

• Climbing Stairs

• House Robber

Kadane's Algo

• Maximum subarray sum

• Minimum Subarray Sum

• Maximum product subarray

• Maximum Subarray Sum with One Deletion

• Maximum Absolute Sum of Any Subarray

• Maximum Sum Circular Subarray

Array

• Trionic Array I

• Trionic Array II

• Transformed Array

• Longest Balanced Subarray I

• Longest Balanced Subarray II

• Longest Balanced Substring I

• Longest Balanced Substring II

• Minimum Swaps to Arrange a Binary Grid

• Special Positions in a Binary Matrix

• Get Biggest Three Rhombus Sums in a Grid

• Largest Submatrix With Rearrangements

• Count Submatrices with Top-Left Element and Sum Less Than k

• Count Submatrices With Equal Frequency of X and Y

• Flip Square Submatrix Vertically

• Determine Whether Matrix Can Be Obtained By Rotation

• Maximum Non Negative Product in a Matrix

• Construct Product Matrix

• Equal Sum Grid Partition I

• Equal Sum Grid Partition II

• Matrix Similarity After Cyclic Shifts

• Lexicographically Smallest Generated String

Tree

• Balance a Binary Search Tree

Bit manipulation

• Add Binary

• Reverse Bits

• Binary Watch

• Binary Number with Alternating Bits

• Prime Number of Set Bits in Binary Representation

• Binary Gap

• Check If a String Contains All Binary Codes of Size K

• Sum of Root To Leaf Binary Numbers

• Sort Integers by The Number of 1 Bits

• Number of Steps to Reduce a Number in Binary Representation to One

• Minimum Operations to Equalize Binary String

• Concatenation of Consecutive Binary Numbers

• Partitioning Into Minimum Number Of Deci-Binary Numbers

• Find Kth Bit in Nth Binary String

• Complement of Base 10 Integer

String

• Count Binary Substrings

• Minimum Changes To Make Alternating Binary String

• Check if Binary String Has at Most One Segment of Ones

• Find Unique Binary String

• Find All Possible Stable Binary Arrays I

• Find All Possible Stable Binary Arrays II

• The k-th Lexicographical String of All Happy Strings of Length n

Recursion

• Special Binary String

API Problems

• Fancy Sequence

April 2026 Problems

• Robot Collisions

• Maximum Amount of Money Robot Can Earn

• Maximum Walls Destroyed by Robots

• Maximum Amount of Money Robot Can Earn

• Decode the Slanted Ciphertext

• Robot Return to Origin

• Walking Robot Simulation

• Walking Robot Simulation II

• XOR After Range Multiplication Queries I

• XOR After Range Multiplication Queries II

• Minimum Distance Between Three Equal Elements I

• Minimum Distance Between Three Equal Elements II

• Minimum Distance to Type a Word Using Two Fingers

• Minimum Distance to the Target Element

• Minimum Total Distance Traveled

• Shortest Distance to Target String in a Circular Array

• Closest Equal Element Queries

• Minimum Absolute Distance Between Mirror Pairs

• Mirror Distance of an Integer

• Maximum Distance Between a Pair of Values

• Two Furthest Houses With Different Colors

• Minimize Hamming Distance After Swap Operations

• Words Within Two Edits of Dictionary

• Sum of Distances

• Furthest Point From Origin

• Maximize the Distance Between Points on a Square

• Detect Cycles in 2D Grid

• Check if There is a Valid Path in a Grid

• Minimum Operations to Make a Uni-Value Grid

• Maximum Score From Grid Operations

• Maximum Path Score in a Grid

May 2026 Problems

• Rotate Function

• Rotated Digits

• Rotate String

• Rotate Image

• Rotate List

• Rotating the Box

• Jump Game IX

• Minimum Jumps to Reach End via Prime Teleportation

• Cyclically Rotating a Grid

• Maximum Number of Jumps to Reach the Last Index

• Separate the Digits in an Array

• Minimum Initial Energy to Finish Tasks

• Minimum Moves to Make Array Complementary

• Check if Array is Good

• Find Minimum in Rotated Sorted Array

• Find Minimum in Rotated Sorted Array II

• Minimum Cost For Tickets

• Jump Game IV

• Minimum Common Value

• Find the Prefix Common Array of Two Arrays

• Find the Length of the Longest Common Prefix

• Search in Rotated Sorted Array

• Check if Array Is Sorted and Rotated

• Jump Game V

• Jump Game VII

• Count the Number of Special Characters I

• Count the Number of Special Characters II

• Longest Common Suffix Queries

• Minimum Element After Replacement With Digit Sum

• Block Placement Queries

• Destroying Asteroids

June 2026 Problems

• Minimum Cost of Buying Candies With Discount

• Earliest Finish Time for Land and Water Rides I

• Earliest Finish Time for Land and Water Rides II

• Total Waviness of Numbers in Range I

• Total Waviness of Numbers in Range II

• Left and Right Sum Differences

• Create Binary Tree From Descriptions

• Partition Array According to Given Pivot

• Maximum Total Subarray Value I

• Maximum Total Subarray Value II

• Number of Ways to Assign Edge Weights I

• Number of Ways to Assign Edge Weights II

• Weighted Word Mapping

• Maximum Twin Sum of a Linked List

• Delete the Middle Node of a Linked List

• Process String with Special Operations I

• Process String with Special Operations II

• Angle Between Hands of a Clock

• Find the Highest Altitude

• Maximum Building Height

• Maximum Ice Cream Bars

• Maximum Number of Balloons

• Number of ZigZag Arrays I

• Number of ZigZag Arrays II

• Count Subarrays With Majority Element I

• Count Subarrays With Majority Element II

• Find the Maximum Number of Elements in Subset

• Maximum Element After Decreasing and Rearranging

• Number of Strings That Appear as Substrings in Word

• Number of Substrings Containing All Three Characters

• Find the Lexicographically Smallest Valid Sequence

July 2026 Problems

• Find the Safest Path in a Grid

• Find a Safe Walk Through a Grid

• Network Recovery Pathways

• Minimum Score of a Path Between Two Cities

• Number of Paths with Max Score

• Count the Number of Complete Components

• Remove Covered Intervals

• Concatenate Non-Zero Digits and Multiply by Sum I

• Concatenate Non-Zero Digits and Multiply by Sum II

• Path Existence Queries in a Graph I

• Path Existence Queries in a Graph II

• Rank Transform of an Array

• Sequential Digits

• Find the Number of Subsequences With Equal GCD

• GCD of Odd and Even Sums

• Sum of GCD of Formed Pairs

• Sorted GCD Pair Queries

• Find Greatest Common Divisor of Array

• Smallest Subsequence of Distinct Characters

• Shift 2D Grid

• Maximize Active Section with Trade I

• Maximize Active Section with Trade II

• Number of Unique XOR Triplets I

• Number of Unique XOR Triplets II

• Maximum Product of Two Digits

• Maximum Product of Three Numbers

• Maximum Product of Two Elements in an Array

• Smallest Palindromic Rearrangement I

• Smallest Palindromic Rearrangement II

• Minimum Number of Pushes to Type Word I

• Minimum Number of Pushes to Type Word II

August 2026 Problems

• Predict the Winner

• Stone Game

• Stone Game III

• Find Missing Elements

• Remove Methods From Project

• Smallest Divisible Digit Product I

• Smallest Divisible Digit Product II

• Stone Game II

• Stone Game IV

• Smallest Missing Integer Greater Than Sequential Prefix Sum

• Length of Longest Subarray With at Most K Frequency

• Longest Substring of One Repeating Character

• Maximum Length Substring With Two Occurrences

• Longest Subsequence With Non-Zero Bitwise XOR

• Stone Game IX

• Stone Game V

• Find the Largest Almost Missing Integer

• Cinema Seat Allocation

• Distribute Elements Into Two Arrays I

• Kth Smallest Amount With Single Denomination Combination

• Check Divisibility by Digit Sum and Product

• Sum Game

• Stone Game VIII

• Smallest Missing Multiple of K

• Shortest and Lexicographically Smallest Beautiful String

• Lexicographically Smallest Permutation Greater Than Target

• Lexicographically Smallest Palindromic Permutation Greater Than Target

• Make Lexicographically Smallest Array by Swapping Elements

• Removing Minimum and Maximum From Array

• Find the Minimum and Maximum Number of Nodes Between Critical Points

• Minimum Moves to Clean the Classroom

• Construct Uniform Parity Array I

• Construct Uniform Parity Array II

• Smallest Stable Index I

• Smallest Stable Index II

• Distinct Subsequences

• Distinct Subsequences II

LeetCode 75

• Merge Strings Alternately

• Greatest Common Divisor of Strings

• Kids With the Greatest Number of Candies

• Can Place Flowers

• Reverse Vowels of a String

• Reverse Words in a String

• Product of Array Except Self

• Increasing Triplet Subsequence

• String Compression

• Move Zeroes

• Is Subsequence

• Container With Most Water

• Max Number of K-Sum Pairs

• Maximum Average Subarray I

• Maximum Number of Vowels in a Substring of Given Length

• Max Consecutive Ones III

• Longest Subarray of 1's After Deleting One Element

• Find the Highest Altitude

• Find Pivot Index

• Find the Difference of Two Arrays

• Unique Number of Occurrences

• Determine if Two Strings Are Close

• Equal Row and Column Pairs

• Removing Stars From a String

• Asteroid Collision

• Decode String

• Number of Recent Calls

• Dota2 Senate

• Delete the Middle Node of a Linked List

• Odd Even Linked List

• Reverse Linked List

• Maximum Twin Sum of a Linked List

• Maximum Depth of Binary Tree

• Leaf-Similar Trees

• Count Good Nodes in Binary Tree

• Path Sum III

• Longest ZigZag Path in a Binary Tree

• Lowest Common Ancestor of a Binary Tree

• Binary Tree Right Side View

• Maximum Level Sum of a Binary Tree

• Search in a Binary Search Tree

• Delete Node in a BST

• Keys and Rooms

• Number of Provinces

• Reorder Routes to Make All Paths Lead to the City Zero

• Evaluate Division

• Nearest Exit from Entrance in Maze

• Rotting Oranges