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Interview question tracker

IBM Coding Interview Questions — All time

Practice 158 coding questions from IBM company-tagged LeetCode lists across all available reporting periods. Explore reported interview questions and track your progress.

Company-wide data from Fahad7177-jeh/leetcode-company-wise-questions; see its AGPL-3.0 license. All-time questions also use dataengineervishal/leetcode-companywise-questions (MIT license).

Reporting periods reflect source data, not verified interview dates. Questions can recur; inclusion does not guarantee they will appear in your interview.

Updated weekly · Latest source check: 15 Oct 2026ⓘLatest successful check of the sources used by this company. A check does not necessarily mean the questions changed.

One question at a time.

Top questions 158

Done	Question	LeetCode
Mark Exclusive Time of Functions completed	Exclusive Time of Functions	Solve
Mark Fizz Buzz completed	Fizz Buzz	Solve
Mark Best Time to Buy and Sell Stock completed	Best Time to Buy and Sell Stock	Solve
Mark Count Ways to Group Overlapping Ranges completed	Count Ways to Group Overlapping Ranges	Solve
Mark Integer to Roman completed	Integer to Roman	Solve
Mark Merge Intervals completed	Merge Intervals	Solve
Mark Minimum Operations to Make All Array Elements Equal completed	Minimum Operations to Make All Array Elements Equal	Solve
Mark Roman to Integer completed	Roman to Integer	Solve
Mark Two Sum completed	Two Sum	Solve
Mark Activity Participants completed	Activity Participants	Solve
Mark Average Value of Even Numbers That Are Divisible by Three completed	Average Value of Even Numbers That Are Divisible by Three	Solve
Mark Count the Number of Incremovable Subarrays II completed	Count the Number of Incremovable Subarrays II	Solve
Mark Count Vowel Strings in Ranges completed	Count Vowel Strings in Ranges	Solve
Mark Find Occurrences of an Element in an Array completed	Find Occurrences of an Element in an Array	Solve
Mark Find Products of Elements of Big Array completed	Find Products of Elements of Big Array	Solve
Mark Find the Array Concatenation Value completed	Find the Array Concatenation Value	Solve
Mark Find The First Player to win K Games in a Row completed	Find The First Player to win K Games in a Row	Solve
Mark Longest Mountain in Array completed	Longest Mountain in Array	Solve
Mark Longest Substring Without Repeating Characters completed	Longest Substring Without Repeating Characters	Solve
Mark Maximum Profitable Triplets With Increasing Prices I completed	Maximum Profitable Triplets With Increasing Prices I	Solve
Mark Maximum Profitable Triplets With Increasing Prices II completed	Maximum Profitable Triplets With Increasing Prices II	Solve
Mark Minimum Absolute Difference completed	Minimum Absolute Difference	Solve
Mark Minimum Length of String After Operations completed	Minimum Length of String After Operations	Solve
Mark Minimum Levels to Gain More Points completed	Minimum Levels to Gain More Points	Solve
Mark Minimum Moves to Equal Array Elements completed	Minimum Moves to Equal Array Elements	Solve
Mark Minimum Operations to Make Columns Strictly Increasing completed	Minimum Operations to Make Columns Strictly Increasing	Solve
Mark Minimum Operations to Make Median of Array Equal to K completed	Minimum Operations to Make Median of Array Equal to K	Solve
Mark Number of Divisible Triplet Sums completed	Number of Divisible Triplet Sums	Solve
Mark Rotate Image completed	Rotate Image	Solve
Mark Sort the Students by Their Kth Score completed	Sort the Students by Their Kth Score	Solve
Mark Taking Maximum Energy From the Mystic Dungeon completed	Taking Maximum Energy From the Mystic Dungeon	Solve
Mark Type of Triangle completed	Type of Triangle	Solve
Mark Valid Parentheses completed	Valid Parentheses	Solve
Mark Count Binary Substrings completed	Count Binary Substrings	Solve
Mark Find Pivot Index completed	Find Pivot Index	Solve
Mark Letter Combinations of a Phone Number completed	Letter Combinations of a Phone Number	Solve
Mark Lexicographically Smallest String After Substring Operation completed	Lexicographically Smallest String After Substring Operation	Solve
Mark Longest Palindromic Substring completed	Longest Palindromic Substring	Solve
Mark Maximum Sum of Distinct Subarrays With Length K completed	Maximum Sum of Distinct Subarrays With Length K	Solve
Mark Maximum Units on a Truck completed	Maximum Units on a Truck	Solve
Mark Number of Operations to Make Network Connected completed	Number of Operations to Make Network Connected	Solve
Mark Numbers With Repeated Digits completed	Numbers With Repeated Digits	Solve
Mark Spiral Matrix completed	Spiral Matrix	Solve
Mark String Compression completed	String Compression	Solve
Mark Water Bottles completed	Water Bottles	Solve
Mark 3Sum completed	3Sum	Solve
Mark Backspace String Compare completed	Backspace String Compare	Solve
Mark Climbing Stairs completed	Climbing Stairs	Solve
Mark Count Pairs Of Similar Strings completed	Count Pairs Of Similar Strings	Solve
Mark Find the Smallest Divisor Given a Threshold completed	Find the Smallest Divisor Given a Threshold	Solve
Mark Group Anagrams completed	Group Anagrams	Solve
Mark Height Checker completed	Height Checker	Solve
Mark Largest Number After Digit Swaps by Parity completed	Largest Number After Digit Swaps by Parity	Solve
Mark Longest Common Prefix completed	Longest Common Prefix	Solve
Mark Longest Consecutive Sequence completed	Longest Consecutive Sequence	Solve
Mark Max Consecutive Ones III completed	Max Consecutive Ones III	Solve
Mark Maximum Subarray completed	Maximum Subarray	Solve
Mark Median of Two Sorted Arrays completed	Median of Two Sorted Arrays	Solve
Mark Meeting Rooms II completed	Meeting Rooms II	Solve
Mark Merge Strings Alternately completed	Merge Strings Alternately	Solve
Mark Minimum String Length After Removing Substrings completed	Minimum String Length After Removing Substrings	Solve
Mark Minimum Swaps to Group All 1's Together II completed	Minimum Swaps to Group All 1's Together II	Solve
Mark Missing Number completed	Missing Number	Solve
Mark Number of Divisible Substrings completed	Number of Divisible Substrings	Solve
Mark Number of Islands completed	Number of Islands	Solve
Mark Product of Array Except Self completed	Product of Array Except Self	Solve
Mark Report Spam Message completed	Report Spam Message	Solve
Mark Shortest and Lexicographically Smallest Beautiful String completed	Shortest and Lexicographically Smallest Beautiful String	Solve
Mark Single-Threaded CPU completed	Single-Threaded CPU	Solve
Mark Smallest Missing Non-negative Integer After Operations completed	Smallest Missing Non-negative Integer After Operations	Solve
Mark Subarray Product Less Than K completed	Subarray Product Less Than K	Solve
Mark Subarray Sum Equals K completed	Subarray Sum Equals K	Solve
Mark The Employee That Worked on the Longest Task completed	The Employee That Worked on the Longest Task	Solve
Mark Valid Anagram completed	Valid Anagram	Solve
Mark Validate Binary Search Tree completed	Validate Binary Search Tree	Solve
Mark 3Sum Smaller completed	3Sum Smaller	Solve
Mark Add Binary completed	Add Binary	Solve
Mark Alert Using Same Key-Card Three or More Times in a One Hour Period completed	Alert Using Same Key-Card Three or More Times in a One Hour Period	Solve
Mark Asteroid Collision completed	Asteroid Collision	Solve
Mark Big Countries completed	Big Countries	Solve
Mark Candy completed	Candy	Solve
Mark Check if Array Is Sorted and Rotated completed	Check if Array Is Sorted and Rotated	Solve
Mark Container With Most Water completed	Container With Most Water	Solve
Mark Contains Duplicate completed	Contains Duplicate	Solve
Mark Count Number of Teams completed	Count Number of Teams	Solve
Mark Course Schedule completed	Course Schedule	Solve
Mark Course Schedule II completed	Course Schedule II	Solve
Mark Degree of an Array completed	Degree of an Array	Solve
Mark Divide Intervals Into Minimum Number of Groups completed	Divide Intervals Into Minimum Number of Groups	Solve
Mark Employees Earning More Than Their Managers completed	Employees Earning More Than Their Managers	Solve
Mark Find All Possible Stable Binary Arrays II completed	Find All Possible Stable Binary Arrays II	Solve
Mark Find Longest Calls completed	Find Longest Calls	Solve
Mark Find Minimum in Rotated Sorted Array completed	Find Minimum in Rotated Sorted Array	Solve
Mark Find the Duplicate Number completed	Find the Duplicate Number	Solve
Mark Find the Index of the First Occurrence in a String completed	Find the Index of the First Occurrence in a String	Solve
Mark First Unique Character in a String completed	First Unique Character in a String	Solve
Mark Flip String to Monotone Increasing completed	Flip String to Monotone Increasing	Solve
Mark Flipping an Image completed	Flipping an Image	Solve
Mark Gas Station completed	Gas Station	Solve
Mark Generate Parentheses completed	Generate Parentheses	Solve
Mark Get Equal Substrings Within Budget completed	Get Equal Substrings Within Budget	Solve
Mark Gray Code completed	Gray Code	Solve
Mark Grumpy Bookstore Owner completed	Grumpy Bookstore Owner	Solve
Mark Heaters completed	Heaters	Solve
Mark Intersection of Two Arrays completed	Intersection of Two Arrays	Solve
Mark Intersection of Two Arrays II completed	Intersection of Two Arrays II	Solve
Mark Jump Game II completed	Jump Game II	Solve
Mark Kth Missing Positive Number completed	Kth Missing Positive Number	Solve
Mark Last Substring in Lexicographical Order completed	Last Substring in Lexicographical Order	Solve
Mark Least Number of Unique Integers after K Removals completed	Least Number of Unique Integers after K Removals	Solve
Mark Linked List Cycle completed	Linked List Cycle	Solve
Mark LRU Cache completed	LRU Cache	Solve
Mark Majority Element completed	Majority Element	Solve
Mark Make Lexicographically Smallest Array by Swapping Elements completed	Make Lexicographically Smallest Array by Swapping Elements	Solve
Mark Maximum Value at a Given Index in a Bounded Array completed	Maximum Value at a Given Index in a Bounded Array	Solve
Mark Merge k Sorted Lists completed	Merge k Sorted Lists	Solve
Mark Merge Sorted Array completed	Merge Sorted Array	Solve
Mark Middle of the Linked List completed	Middle of the Linked List	Solve
Mark Min Stack completed	Min Stack	Solve
Mark Minimum Add to Make Parentheses Valid completed	Minimum Add to Make Parentheses Valid	Solve
Mark Minimum Bit Flips to Convert Number completed	Minimum Bit Flips to Convert Number	Solve
Mark Minimum Cost to Connect Sticks completed	Minimum Cost to Connect Sticks	Solve
Mark Minimum Number of Changes to Make Binary String Beautiful completed	Minimum Number of Changes to Make Binary String Beautiful	Solve
Mark Minimum Number of Flips to Make the Binary String Alternating completed	Minimum Number of Flips to Make the Binary String Alternating	Solve
Mark Minimum Number of Swaps to Make the String Balanced completed	Minimum Number of Swaps to Make the String Balanced	Solve
Mark Minimum Operations to Reduce an Integer to 0 completed	Minimum Operations to Reduce an Integer to 0	Solve
Mark Minimum Suffix Flips completed	Minimum Suffix Flips	Solve
Mark Minimum Time to Type Word Using Special Typewriter completed	Minimum Time to Type Word Using Special Typewriter	Solve
Mark Minimum Value to Get Positive Step by Step Sum completed	Minimum Value to Get Positive Step by Step Sum	Solve
Mark Minimum Window Substring completed	Minimum Window Substring	Solve
Mark Move Zeroes completed	Move Zeroes	Solve
Mark N-Queens completed	N-Queens	Solve
Mark Next Permutation completed	Next Permutation	Solve
Mark Odd String Difference completed	Odd String Difference	Solve
Mark Online Stock Span completed	Online Stock Span	Solve
Mark Pacific Atlantic Water Flow completed	Pacific Atlantic Water Flow	Solve
Mark Palindrome Number completed	Palindrome Number	Solve
Mark Plus One completed	Plus One	Solve
Mark Reach a Number completed	Reach a Number	Solve
Mark Rearrange Array to Maximize Prefix Score completed	Rearrange Array to Maximize Prefix Score	Solve
Mark Remove All Occurrences of a Substring completed	Remove All Occurrences of a Substring	Solve
Mark Remove Colored Pieces if Both Neighbors are the Same Color completed	Remove Colored Pieces if Both Neighbors are the Same Color	Solve
Mark Remove Duplicates from Sorted Array completed	Remove Duplicates from Sorted Array	Solve
Mark Remove K Digits completed	Remove K Digits	Solve
Mark Removing Stars From a String completed	Removing Stars From a String	Solve
Mark Reorganize String completed	Reorganize String	Solve
Mark Reverse Integer completed	Reverse Integer	Solve
Mark Reverse Linked List completed	Reverse Linked List	Solve
Mark Reverse Words in a String completed	Reverse Words in a String	Solve
Mark Rotate Array completed	Rotate Array	Solve
Mark Search in Rotated Sorted Array completed	Search in Rotated Sorted Array	Solve
Mark Search Insert Position completed	Search Insert Position	Solve
Mark Shuffle the Array completed	Shuffle the Array	Solve
Mark Sliding Window Maximum completed	Sliding Window Maximum	Solve
Mark Sort Characters By Frequency completed	Sort Characters By Frequency	Solve
Mark Subsets completed	Subsets	Solve
Mark The kth Factor of n completed	The kth Factor of n	Solve
Mark Word Search completed	Word Search	Solve