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Ibm Master DSA Sheet

This compilation contains exclusive, previously asked data structure and algorithm questions from real Ibm interviews. Focus on these core problem patterns to confidently tackle even the hardest interview challenges.

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Course Schedule II
Alert Using Same Key-Card Three or More Times in a One Hour Period6 Months
Minimum Time to Type Word Using Special Typewriter
Meeting Rooms II
Remove Colored Pieces if Both Neighbors are the Same Color
Jump Game II
Min Stack
Valid Parentheses3 Months
Minimum Bit Flips to Convert Number
Find Resultant Array After Removing Anagrams6 Months
Asteroid Collision
Grumpy Bookstore Owner6 Months
Largest Number After Digit Swaps by Parity
Subarray Product Less Than K
Spiral Matrix
Minimum Value to Get Positive Step by Step Sum
Reverse Linked List
Longest Substring Without Repeating Characters3 Months
The Employee That Worked on the Longest Task
Product of Array Except Self
Merge Intervals3 Months
Generate Parentheses6 Months
Trapping Rain Water3 Months
Longest Palindromic Substring30 Days
Next Permutation
Number of Divisible Substrings
Divide Intervals Into Minimum Number of Groups
Sort the Students by Their Kth Score
Climbing Stairs
Minimum Operations to Make Median of Array Equal to K
Find Products of Elements of Big Array
Maximum Profitable Triplets With Increasing Prices II
Find the Array Concatenation Value
Minimum Levels to Gain More Points
Maximum Profitable Triplets With Increasing Prices I
Average Value of Even Numbers That Are Divisible by Three
Count the Number of Incremovable Subarrays II
Rotate Image
Minimum Length of String After Operations
Minimum Window Substring3 Months
Odd String Difference
Count Vowel Strings in Ranges
Activity Participants
Make Lexicographically Smallest Array by Swapping Elements
Minimum Operations to Make Columns Strictly Increasing
Minimum String Length After Removing Substrings
Valid Palindrome II3 Months
Remove All Occurrences of a Substring
Middle of the Linked List
Course Schedule
Maximum Value at a Given Index in a Bounded Array6 Months
Two Sum3 Months
Search in Rotated Sorted Array
String Compression
Rotting Oranges
Backspace String Compare
Count Binary Substrings
Height Checker
Number of Islands
Find the Smallest Divisor Given a Threshold
Exclusive Time of Functions
Non-overlapping Intervals
Reverse Words in a String
Move Zeroes
Find the Index of the First Occurrence in a String
Heaters6 Months
Longest Common Prefix
Taking Maximum Energy From the Mystic Dungeon
Maximum Sum of Distinct Subarrays With Length K
Container With Most Water
Roman to Integer3 Months
LRU Cache
Minimum Operations to Make All Array Elements Equal
Rearrange Array to Maximize Prefix Score
Merge Sorted Array
Add Binary
Lexicographically Smallest String After Substring Operation
Longest Valid Parentheses30 Days
Contains Duplicate
Number of Divisible Triplet Sums
Maximum Subarray
Report Spam Message
Group Anagrams6 Months
Shortest and Lexicographically Smallest Beautiful String
Last Substring in Lexicographical Order
Minimum Number of Flips to Make the Binary String Alternating30 Days
Merge k Sorted Lists
3Sum6 Months
Maximum Units on a Truck
Maximum Median Sum of Subsequences of Size 33 Months
N-Queens
Median of Two Sorted Arrays
Letter Combinations of a Phone Number
Valid Anagram
Majority Element
Gas Station
Online Stock Span
Subarray Sum Equals K
Minimum Absolute Difference
Find the Duplicate Number
Max Consecutive Ones III6 Months
Integer to Roman3 Months
Palindrome Number6 Months
Rotate Array
Add Two Numbers6 Months
Word Search
Best Time to Buy and Sell Stock6 Months
Simplify Path
Minimum Cost to Connect Sticks6 Months
Count Ways to Group Overlapping Ranges
First Unique Character in a String
Count Pairs Of Similar Strings
Minimum Number of Swaps to Make the String Balanced
Remove Duplicates from Sorted Array
Intersection of Two Arrays II
Find Minimum in Rotated Sorted Array
Kth Largest Element in an Array
Max Consecutive Ones
Search Insert Position
Coin Change3 Months
Plus One
Find Occurrences of an Element in an Array3 Months
Sliding Window Maximum6 Months
Number of Substrings With Only 1s3 Months
Reorganize String
Check if Array Is Sorted and Rotated
Last Stone Weight
Longest Consecutive Sequence
Water Bottles6 Months
Merge Strings Alternately
Subsets
Missing Number
Fizz Buzz3 Months
Reverse Integer
Find Longest Calls
Optimal Partition of String6 Months
Longest Mountain in Array6 Months
Minimum Number of Moves to Make Palindrome3 Months
Candy
Sort Characters By Frequency
Flip String to Monotone Increasing
Find All Possible Stable Binary Arrays II
3Sum Smaller
Validate Binary Search Tree
Find The First Player to win K Games in a Row
Minimum Insertion Steps to Make a String Palindrome
Type of Triangle
Kth Missing Positive Number
Minimum Swaps to Group All 1's Together II
Minimum Number of Changes to Make Binary String Beautiful
Find Pivot Index
Minimum Add to Make Parentheses Valid
Single-Threaded CPU6 Months
Big Countries
Number of Operations to Make Network Connected6 Months
Minimum Number of Increments on Subarrays to Form a Target Array3 Months
Boats to Save People3 Months
Linked List Cycle
Partition Labels
Flipping an Image
Minimize XOR30 Days
Gray Code
Sum of Absolute Differences in a Sorted Array3 Months
Minimize Maximum Pair Sum in Array
Get Equal Substrings Within Budget
Reach a Number3 Months
Minimum Moves to Equal Array Elements
Removing Stars From a String
Count Number of Teams
Smallest Missing Non-negative Integer After Operations