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    Technology

    Top 100 Coding Interview Questions: The Ultimate Cheat Sheet (DSA)

    Sproutern Career TeamLast Updated: 2026-01-0520 min read
    Reviewed by Sproutern Editorial TeamEditorial standardsMethodology

    The definitive list of 100 most asked coding interview questions. Categorized by Arrays, Strings, Linked Lists, Trees, and DP. Master these to crack product companies.

    Top 100 Coding Interview Questions: The Ultimate Cheat Sheet (DSA)

    You don't need to solve 1000 LeetCode problems. You need to solve the right 100 problems. Patterns repeat. If you master these 100, you can solve almost any variation asked in interviews at Amazon, Google, Microsoft, or startups.

    Here is the curated list, categorized by topic.


    1. Arrays (The Basics)

    1. Two Sum (The most famous question).
    2. Best Time to Buy and Sell Stock (Valley-Peak approach).
    3. Contains Duplicate.
    4. Product of Array Except Self (No division allowed).
    5. Maximum Subarray (Kadaneโ€™s Algorithm).
    6. Maximum Product Subarray.
    7. Find Minimum in Rotated Sorted Array.
    8. Search in Rotated Sorted Array.
    9. 3Sum.
    10. Container With Most Water.

    2. Strings

    1. Valid Anagram.
    2. Valid Palindrome.
    3. Longest Substring Without Repeating Characters (Sliding Window).
    4. Longest Palindromic Substring.
    5. Group Anagrams.
    6. Valid Parentheses (Stack).

    3. Linked Lists

    1. Reverse a Linked List (Iterative & Recursive).
    2. Detect Cycle in a Linked List (Floydโ€™s Cycle Finding).
    3. Merge Two Sorted Lists.
    4. Remove Nth Node From End of List.
    5. Reorder List.
    6. Merge K Sorted Lists (Hard).

    4. Trees & Graphs

    1. Maximum Depth of Binary Tree.
    2. Same Tree.
    3. Invert Binary Tree (Google Classic).
    4. Binary Tree Level Order Traversal (BFS).
    5. Subtree of Another Tree.
    6. Lowest Common Ancestor (LCA).
    7. Validate Binary Search Tree.
    8. Number of Islands (Graph BFS/DFS).
    9. Clone Graph.
    10. Course Schedule (Topological Sort).

    5. Dynamic Programming (DP)

    1. Climbing Stairs (Fibonacci).
    2. Coin Change.
    3. Longest Increasing Subsequence (LIS).
    4. Longest Common Subsequence (LCS).
    5. Word Break.
    6. House Robber.
    7. Unique Paths (Grid).
    8. Jump Game.

    6. Sorting & Searching

    1. Merge Sort Implementation.
    2. Quick Sort Implementation.
    3. Binary Search.
    4. Top K Frequent Elements (Heap).
    5. Kth Largest Element in an Array.

    How to Practice?

    Step 1: Brute Force

    Don't jump to the optimal solution. First, say the O(N^2) solution aloud. It shows you can think.

    Step 2: Optimize

    "Can we do this in O(N)? Can we use a Hash Map?"

    Step 3: Dry Run

    Write code on paper (or Google Doc). In interviews, you won't always have a compiler to tell you syntax errors.


    Behavioral Tips for Coding Interviews

    1. Think Aloud: Never stay silent for 5 minutes. The interviewer wants to hear your thought process.
    2. Clarify Constraints: "Is the array sorted?", "Can numbers be negative?", "What if the input is empty?" Asking these questions before coding earns huge points.
    3. Test Cases: After writing code, manually run a test case through it to catch bugs yourself.

    Resources

    • LeetCode: The Gold standard.
    • NeetCode.io: Excellent video explanations for these 150 questions.
    • GeeksForGeeks: Great for reading theory.

    Code, Compile, Conquer. Practice these questions in our specialized coding playground on Sproutern


    Related Resources on Sproutern

    • AI Resume Optimizer โ€” Get your resume reviewed by AI for free
    • Career Roadmaps โ€” Plan your career path step by step
    • Interview Experiences โ€” Read real stories from candidates
    • Salary Calculator โ€” Compare salaries across companies
    • Typing Speed Test โ€” Test and improve your typing speed

    This article was last reviewed and updated on February 23, 2026. Source: Sproutern Career Research Team.


    Frequently Asked Questions

    Is this information up-to-date?

    Yes! This article is regularly reviewed and updated by the Sproutern Career Research Team with the latest data and insights for 2026.

    Can freshers benefit from this guide?

    Absolutely. This guide covers information relevant to students, freshers, and experienced professionals. We include specific tips for each experience level.

    Where can I find more resources?

    Explore our complete resource library with 200+ free tools, guides, and templates for career preparation.


    Related Resources on Sproutern

    • AI Resume Optimizer
    • Salary Calculator
    • Mock Interview Tool
    • LinkedIn Optimization Guide
    • Salary Negotiation Guide
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    Cite This Article

    If you found this article helpful, please cite it as:

    Sproutern Team. "Top 100 Coding Interview Questions: The Ultimate Cheat Sheet (DSA)." Sproutern, 2026-01-05, https://app.sproutern.com/blog/100-coding-interview-questions. Accessed April 10, 2026.