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Python: Which practice avoids a common mistake with Two-Pointer Technique?

Difficulty:

Medium

Questions:

1

Time Limit:

2 minutes

Passing Score:

100%

Question

Which practice avoids a common mistake with Two-Pointer Technique?

  1. Ignore the Two-Pointer Technique issue and rely on team discipline instead of clearer APIs or invariants.
  2. Silence the Two-Pointer Technique problem by using broad catches, hidden globals, or extra shared mutable state.
  3. Prefer the version of Two-Pointer Technique that makes behavior less predictable as long as the code still runs.
  4. Do not reach for two pointers automatically when the sequence lacks the ordering or invariant that makes pointer moves meaningful.

Hint

Look for the option that protects correctness instead of hiding the problem.

Answer and rationale

Correct answer: D. Do not reach for two pointers automatically when the sequence lacks the ordering or invariant that makes pointer moves meaningful.

Do not reach for two pointers automatically when the sequence lacks the ordering or invariant that makes pointer moves meaningful. This is a common failure mode in real Python code and a frequent interview follow-up.

Track: Python