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By Vishesh Yadav20 problems5 Easy13 Medium2 HardUpdated 21 Sept 2025

20problems

5Easy

13Medium

2Hard

Signed in, the sheet shows which of these you have solved.

TitleSolutionAcceptDifficultyTopics

1. Two SumVideo

Solution57.8%Easy

Array, Hash Table· 127 companies

2. Add Two NumbersVideo

Solution49.3%Medium

Linked List, Math +1· 37 companies

3. Longest Substring Without Repeating CharactersVideo

Solution39.9%Medium

Hash Table, Sliding Window +1· 104 companies

4. Median of Two Sorted ArraysVideo

Solution47.9%Hard

Array, Binary Search +1· 45 companies

5. Longest Palindromic SubstringVideo

Solution38.7%Medium

Dynamic Programming, String +1· 81 companies

6. Zigzag ConversionVideo

Solution54.9%Medium

String· 19 companies

7. Reverse IntegerVideo

Solution32.2%Medium

Math· 22 companies

8. String to Integer (atoi)Video

Solution21.4%Medium

String· 21 companies

9. Palindrome NumberVideo

Solution61.0%Easy

Math· 31 companies

10. Regular Expression MatchingVideo

Solution31.8%Hard

Dynamic Programming, Recursion +1· 25 companies

11. Container With Most WaterVideo

Solution60.9%Medium

Array, Greedy +1· 57 companies

12. Integer to RomanVideo

Solution71.8%Medium

Hash Table, Math +1· 31 companies

13. Roman to IntegerVideo

Solution67.0%Easy

Hash Table, Math +1· 36 companies

14. Longest Common PrefixVideo

Solution48.6%Easy

String, Trie· 60 companies

15. 3SumVideo

Solution40.1%Medium

Array, Sorting +1· 57 companies

16. 3Sum ClosestVideo

Solution47.4%Medium

Array, Sorting +1· 11 companies

17. Letter Combinations of a Phone NumberVideo

Solution66.9%Medium

Backtracking, Hash Table +1· 34 companies

18. 4SumVideo

Solution42.0%Medium

Array, Sorting +1· 20 companies

19. Remove Nth Node From End of ListVideo

Solution52.4%Medium

Linked List, Two Pointers· 18 companies

20. Valid ParenthesesVideo

Solution45.2%Easy

Stack, String· 113 companies

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