Coding-DSA problems

10 practice problems on arrays, strings and algorithms. Read any problem here; sign in to write and run a solution in C++, Java, Python, JavaScript or C, judged against sample and hidden tests.

1. Valid Palindrome — easy · String, Two Pointers
2. Valid Anagram — easy · String, Hash Table, Sorting
3. Two Sum — easy · Array, Hash Table
4. Move Zeroes — easy · Array, Two Pointers
5. Longest Common Prefix — easy · String
6. Maximum Subarray Sum — medium · Array, Dynamic Programming
7. Rotate Array — medium · Array, Math, Two Pointers
8. Product of Array Except Self — medium · Array, Prefix Sum
9. Longest Substring Without Repeating Characters — medium · String, Sliding Window, Hash Table
10. Trapping Rain Water — hard · Array, Two Pointers, Stack