TCS Interview Questions (217)

Practice real interview problems from TCS

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
21. Merge Two Sorted Lists	Solution	Solve	Easy	Adobe+39	Linked List Recursion
26. Remove Duplicates from Sorted Array	Solution	Solve	Easy	Accenture+27	Array Two Pointers
27. Remove Element	Solution	Solve	Easy	Adobe+9	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
58. Length of Last Word	Solution	Solve	Easy	Amazon+7	String
66. Plus One	Solution	Solve	Easy	Accenture+13	Array Math
67. Add Binary	Solution	Solve	Easy	Amazon+12	Bit Manipulation Math+2
69. Sqrt(x)	Solution	Solve	Easy	Adobe+18	Binary Search Math
70. Climbing Stairs	Solution	Solve	Easy	Accenture+37	Dynamic Programming Math+1
83. Remove Duplicates from Sorted List	Solution	Solve	Easy	Adobe+9	Linked List
88. Merge Sorted Array	Solution	Solve	Easy	Accenture+41	Array Sorting+1
94. Binary Tree Inorder Traversal	Solution	Solve	Easy	Amazon+5	Binary Tree Depth-First Search+2
118. Pascal's Triangle	Solution	Solve	Easy	Accenture+18	Array Dynamic Programming
121. Best Time to Buy and Sell Stock	Solution	Solve	Easy	Accenture+103	Array Dynamic Programming
125. Valid Palindrome	Solution	Solve	Easy	Accenture+41	String Two Pointers
136. Single Number	Solution	Solve	Easy	Accenture+14	Array Bit Manipulation
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
181. Employees Earning More Than Their Managers	Solution	Solve	Easy	Accenture+10	Database
182. Duplicate Emails	Solution	Solve	Easy	Amazon+6	Database
196. Delete Duplicate Emails	Solution	Solve	Easy	Amazon+8	Database
202. Happy Number	Solution	Solve	Easy	Accenture+30	Hash Table Math+1
206. Reverse Linked List	Solution	Solve	Easy	Accenture+35	Linked List Recursion
217. Contains Duplicate	Solution	Solve	Easy	Accenture+22	Array Hash Table+1
219. Contains Duplicate II	Solution	Solve	Easy	Accenture+13	Array Hash Table+1
231. Power of Two	Solution	Solve	Easy	Amazon+11	Bit Manipulation Math+1
242. Valid Anagram	Solution	Solve	Easy	Accenture+40	Hash Table Sorting+1
263. Ugly Number	Solution	Solve	Easy	Amazon+6	Math
268. Missing Number	Solution	Solve	Easy	Adobe+20	Array Binary Search+4
283. Move Zeroes	Solution	Solve	Easy	Accenture+48	Array Two Pointers
303. Range Sum Query - Immutable	Solution	Solve	Easy	Amazon+7	Array Design+1
344. Reverse String	Solution	Solve	Easy	Accenture+15	String Two Pointers
349. Intersection of Two Arrays	Solution	Solve	Easy	Accenture+19	Array Binary Search+3
350. Intersection of Two Arrays II	Solution	Solve	Easy	Amazon+8	Array Binary Search+3
374. Guess Number Higher or Lower	Solution	Solve	Easy	Amazon+6	Binary Search Interactive
387. First Unique Character in a String	Solution	Solve	Easy	Accenture+24	Counting Hash Table+2
405. Convert a Number to Hexadecimal	Solution	Solve	Easy	Amazon+4	Bit Manipulation Math
412. Fizz Buzz	Solution	Solve	Easy	Agoda+18	Math Simulation+1
414. Third Maximum Number	Solution	Solve	Easy	Amazon+7	Array Sorting
455. Assign Cookies	Solution	Solve	Easy	Accenture+8	Array Greedy+2
459. Repeated Substring Pattern	Solution	Solve	Easy	Amazon+7	String String Matching
485. Max Consecutive Ones	Solution	Solve	Easy	Accenture+12	Array
495. Teemo Attacking	Solution	Solve	Easy	Amazon+4	Array Simulation
496. Next Greater Element I	Solution	Solve	Easy	Accenture+16	Array Hash Table+2