pyPython Practice LabFrom first print to final round
TOPIC 18 OF 18

Interview Pattern Synthesis Python lessons

Greedy proof, bit manipulation, and mixed-pattern practice that combines earlier techniques.

6 exercises6+ conceptsBeginner → interview context
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WHAT YOU WILL LEARN

Core concepts

Decide if the last array index is reachableFind a valid gas-station startGenerate target-sum combinationsSearch a word in a character boardValidate a Sudoku boardFind the single value with XOR
REUSABLE THINKING

Problem-solving patterns

  • greedy · array · LeetCode pattern
  • greedy proof · array · company screen
  • backtracking · combination sum · LeetCode pattern
  • backtracking · grid
  • hash set · matrix · LeetCode pattern
LESSON OUTCOME

What this topic builds

Learn the idea once, trace it through two verified cases, then explain why your approach works.

ORDERED LESSONS

All 6 lessons in this topic

Work from top to bottom to build each concept gradually.

  1. #175
    Decide if the last array index is reachable

    Determine whether some sequence of jumps reaches the last position.

    BeginnerPremium
  2. #176
    Find a valid gas-station start

    Find a station from which one complete circuit is possible.

    IntermediatePremium
  3. #177
    Generate target-sum combinations

    List every nondecreasing candidate combination that reaches the target.

    IntermediatePremium
  4. #178
    Search a word in a character board

    Determine that adjacent cells can spell the target without reusing a cell.

    IntermediatePremium
  5. #179
    Validate a Sudoku board

    Validate a partially filled board with no repeated constrained digits.

    AdvancedPremium
  6. #180
    Find the single value with XOR

    Find the only value without a duplicate.

    AdvancedPremium