Practice Problems

Practice Problems

A collection of DSA problems with solutions and explanations.

We will be following on some list of problems from :

  1. Neetcode 150
  2. Some Leetcode Lists :

Problem-Solving Tips

Before Starting
  1. Understand the problem: Read carefully, identify inputs/outputs
  2. Consider examples: Work through small examples manually
  3. Identify patterns: Look for common algorithmic patterns
  4. Plan your approach: Choose appropriate data structures
  5. Consider edge cases: Empty inputs, single elements, etc.
Common Mistakes
  • Not handling edge cases
  • Incorrect time/space complexity analysis
  • Not optimizing for the specific constraints
  • Overcomplicating simple problems

Practice Resources

Online Platforms

  • LeetCode: 2000+ problems with varying difficulty
  • HackerRank: Good for beginners, company-specific problems
  • Codeforces: Competitive programming, regular contests
  • AtCoder: Japanese platform, good for learning

Problem Categories to Master

  1. Arrays & Strings: Two pointers, sliding window, prefix sums
  2. Linked Lists: Fast/slow pointers, reversing, merging
  3. Trees: DFS/BFS, recursion, tree construction
  4. Graphs: DFS/BFS, shortest paths, topological sort
  5. Dynamic Programming: Memoization, tabulation, state transitions
  6. Binary Search: Finding boundaries, optimization problems

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Martin Fowler

First, solve the problem. Then, write the code.

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