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Facebook Topics for Interview Preparation

Last Updated : 23 Jul, 2025

Easy Level

  1. Converting Decimal Number lying between 1 to 3999 to Roman Numerals
  2. Find all triplets with zero sum
  3. Largest subset whose all elements are Fibonacci numbers
  4. Calculate maximum value using '+' or '*' sign between two numbers in a string
  5. Convert Ternary Expression to a Binary Tree
  6. Converting Roman Numerals to Decimal lying between 1 to 3999
  7. Count all distinct pairs with difference equal to k
  8. Decode a string recursively encoded as count followed by substring
  9. Find if string is K-Palindrome or not | Set 2
  10. Find Minimum Depth of a Binary Tree
  11. Find subarray with given sum | Set 1 (Nonnegative Numbers)
  12. Given two unsorted arrays, find all pairs whose sum is x
  13. Greedy Algorithms | Set 1 (Activity Selection Problem)
  14. Look-and-Say Sequence
  15. Smallest subarray with sum greater than a given value
  16. Program to add two binary strings
  17. Rearrange a string in sorted order followed by the integer sum

Medium Level


  1. Boggle | Set 2 (Using Trie)
  2. Count Possible Decodings of a given Digit Sequence
  3. Inplace rotate square matrix by 90 degrees | Set 1
  4. Largest Rectangular Area in a Histogram | Set 2
  5. Largest sum subarray with at-least k numbers
  6. Multiply Large Numbers represented as Strings


Hard Level

  1. Median in a stream of integers (running integers)
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