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Here is a curated list of frequently asked LeetCode questions for a Machine Learning Engineer, Core Ranking role, along with a detailed 4-week practice plan to solve these problems. The plan is structured to balance different difficulty levels and help effectively prepare for technical interviews.

Frequently Asked LeetCode Questions:

  1. Easy:

    • Two Sum (Problem ID: 1)
    • Valid Parentheses (Problem ID: 20)
    • Merge Two Sorted Lists (Problem ID: 21)
    • Best Time to Buy and Sell Stock (Problem ID: 121)
    • Linked List Cycle (Problem ID: 141)

  2. Medium:

    • Add Two Numbers (Problem ID: 2)
    • Longest Substring Without Repeating Characters (Problem ID: 3)
    • Product of Array Except Self (Problem ID: 238)
    • Coin Change (Problem ID: 322)
    • Word Break (Problem ID: 139)

  3. Hard:

    • Median of Two Sorted Arrays (Problem ID: 4)
    • Regular Expression Matching (Problem ID: 10)
    • Merge k Sorted Lists (Problem ID: 23)
    • Trapping Rain Water (Problem ID: 42)
    • Word Ladder (Problem ID: 127)

4-Week Practice Plan:

Week 1:

  • Day 1: Two Sum (Easy)
  • Day 2: Valid Parentheses (Easy)
  • Day 3: Merge Two Sorted Lists (Easy)
  • Day 4: Best Time to Buy and Sell Stock (Easy)
  • Day 5: Linked List Cycle (Easy)
  • Day 6: Review and revise all problems solved in Week 1
  • Day 7: Rest or optional practice on Easy problems

Week 2:

  • Day 1: Add Two Numbers (Medium)
  • Day 2: Longest Substring Without Repeating Characters (Medium)
  • Day 3: Product of Array Except Self (Medium)
  • Day 4: Coin Change (Medium)
  • Day 5: Word Break (Medium)
  • Day 6: Review and revise all problems solved in Week 2
  • Day 7: Rest or optional practice on Medium problems

Week 3:

  • Day 1: Median of Two Sorted Arrays (Hard)
  • Day 2: Regular Expression Matching (Hard)
  • Day 3: Merge k Sorted Lists (Hard)
  • Day 4: Trapping Rain Water (Hard)
  • Day 5: Word Ladder (Hard)
  • Day 6: Review and revise all problems solved in Week 3
  • Day 7: Rest or optional practice on Hard problems

Week 4:

  • Day 1: Revisit and solve Two Sum (Easy) and Add Two Numbers (Medium)
  • Day 2: Revisit and solve Valid Parentheses (Easy) and Longest Substring Without Repeating Characters (Medium)
  • Day 3: Revisit and solve Merge Two Sorted Lists (Easy) and Product of Array Except Self (Medium)
  • Day 4: Revisit and solve Best Time to Buy and Sell Stock (Easy) and Coin Change (Medium)
  • Day 5: Revisit and solve Linked List Cycle (Easy) and Word Break (Medium)
  • Day 6: Mock interview practice with a focus on Hard problems
  • Day 7: Rest and final review of all problems solved

This practice plan ensures a balanced approach across different difficulty levels and provides ample time for review and revision, helping you prepare effectively for technical interviews.