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Computer ScienceBeginnerRevision 1

Array Problem-Solving Patterns

Move beyond nested loops by watching pointers and windows reuse information, then explain when each pattern is valid.

4 stepsAbout 60 minutesRecognize when two pointers or a sliding window can replace repeated work.

A lab, not a slideshow

How each chapter works

1 · Predict

Commit to what you think the system will do before pressing play.

2 · Observe

Change one variable and watch the state, algorithm, or model respond.

3 · Explain

State the invariant or principle, then prove it in the checkpoint.

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Next: Reduce search with two pointers

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  1. Next suggested
    Step 1

    Step 1Experiment

    Reduce search with two pointers

    Predict first, change one input, then explain the state change you observe.

    Open simulation
  2. Step 2

    Step 2Experiment

    Reuse work with a sliding window

    Predict first, change one input, then explain the state change you observe.

    Open simulation
  3. Step 3

    Step 3Experiment

    Contrast the patterns with sorting

    Predict first, change one input, then explain the state change you observe.

    Open simulation
  4. Step 4

    Step 4Prove

    Array patterns checkpoint

    Use the evidence from the chapter to pass a server-scored knowledge check.

    Take knowledge check