IBM Interview Questions (170)

Practice real interview problems from IBM

Title	Solution	Practice	Difficulty	Companies	Topics
1. Two Sum	Solution	Solve	Easy	Accenture+128	Array Hash Table
9. Palindrome Number	Solution	Solve	Easy	Accenture+34	Math
13. Roman to Integer	Solution	Solve	Easy	Accenture+44	Hash Table Math+1
14. Longest Common Prefix	Solution	Solve	Easy	Accenture+56	String Trie
20. Valid Parentheses	Solution	Solve	Easy	Accenture+118	Stack String
26. Remove Duplicates from Sorted Array	Solution	Solve	Easy	Accenture+27	Array Two Pointers
28. Find the Index of the First Occurrence in a String	Solution	Solve	Easy	Adobe+16	String String Matching+1
35. Search Insert Position	Solution	Solve	Easy	Accenture+13	Array Binary Search
66. Plus One	Solution	Solve	Easy	Accenture+13	Array Math
67. Add Binary	Solution	Solve	Easy	Amazon+12	Bit Manipulation Math+2
70. Climbing Stairs	Solution	Solve	Easy	Accenture+37	Dynamic Programming Math+1
88. Merge Sorted Array	Solution	Solve	Easy	Accenture+41	Array Sorting+1
121. Best Time to Buy and Sell Stock	Solution	Solve	Easy	Accenture+103	Array Dynamic Programming
141. Linked List Cycle	Solution	Solve	Easy	Accenture+24	Hash Table Linked List+1
169. Majority Element	Solution	Solve	Easy	Accenture+21	Array Counting+3
206. Reverse Linked List	Solution	Solve	Easy	Accenture+35	Linked List Recursion
217. Contains Duplicate	Solution	Solve	Easy	Accenture+22	Array Hash Table+1
242. Valid Anagram	Solution	Solve	Easy	Accenture+40	Hash Table Sorting+1
268. Missing Number	Solution	Solve	Easy	Adobe+20	Array Binary Search+4
283. Move Zeroes	Solution	Solve	Easy	Accenture+48	Array Two Pointers
350. Intersection of Two Arrays II	Solution	Solve	Easy	Amazon+8	Array Binary Search+3
387. First Unique Character in a String	Solution	Solve	Easy	Accenture+24	Counting Hash Table+2
412. Fizz Buzz	Solution	Solve	Easy	Agoda+18	Math Simulation+1
485. Max Consecutive Ones	Solution	Solve	Easy	Accenture+12	Array
595. Big Countries	Solution	Solve	Easy	Amazon+6	Database
680. Valid Palindrome II	Solution	Solve	Easy	Amazon+15	Greedy String+1
696. Count Binary Substrings	Solution	Solve	Easy	Adobe+19	String Two Pointers
724. Find Pivot Index	Solution	Solve	Easy	Accenture+18	Array Prefix Sum
832. Flipping an Image	Solution	Solve	Easy	Amazon+5	Array Bit Manipulation+3
844. Backspace String Compare	Solution	Solve	Easy	Agoda+14	Simulation Stack+2
876. Middle of the Linked List	Solution	Solve	Easy	Accenture+13	Linked List Two Pointers
1046. Last Stone Weight	Solution	Solve	Easy	Amazon+13	Array Heap (Priority Queue)
1051. Height Checker	Solution	Solve	Easy	Amazon+6	Array Counting Sort+1
1200. Minimum Absolute Difference	Solution	Solve	Easy	Agoda+14	Array Sorting
1413. Minimum Value to Get Positive Step by Step Sum	Solution	Solve	Easy	Amazon+7	Array Prefix Sum
1518. Water Bottles	Solution	Solve	Easy	Accenture+8	Math Simulation
1539. Kth Missing Positive Number	Solution	Solve	Easy	Amazon+9	Array Binary Search
1710. Maximum Units on a Truck	Solution	Solve	Easy	Amazon+6	Array Greedy+1
1752. Check if Array Is Sorted and Rotated	Solution	Solve	Easy	Amazon+9	Array
1768. Merge Strings Alternately	Solution	Solve	Easy	Adobe+11	String Two Pointers
1974. Minimum Time to Type Word Using Special Typewriter	Solution	Solve	Easy	IBM+2	Greedy String
2220. Minimum Bit Flips to Convert Number	Solution	Solve	Easy	Amazon+6	Bit Manipulation
2231. Largest Number After Digit Swaps by Parity	Solution	Solve	Easy	Bloomberg+4	Heap (Priority Queue)Sorting
2273. Find Resultant Array After Removing Anagrams	Solution	Solve	Easy	Amazon+7	Array Hash Table+2
2432. The Employee That Worked on the Longest Task	Solution	Solve	Easy	IBM+1	Array
2451. Odd String Difference	Solution	Solve	Easy	IBM+2	Array Hash Table+1
2455. Average Value of Even Numbers That Are Divisible by Three	Solution	Solve	Easy	IBM	Array Math
2506. Count Pairs Of Similar Strings	Solution	Solve	Easy	Adobe+3	Array Bit Manipulation+3
2562. Find the Array Concatenation Value	Solution	Solve	Easy	Amazon+1	Array Simulation+1
2696. Minimum String Length After Removing Substrings	Solution	Solve	Easy	Amazon+5	Simulation Stack+1