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📜 WAYPOINT LESSON

Reading Your Own Code — the 5-Minute Audit

⭐⭐⭐ advanced⏳ 25 min read📍 Lesson 196 of 281

Before submitting, audit the four places advanced solutions die: overflow, order of operations, off-by-one, and the invariant you assumed but never tested.

The pre-submission audit

Five minutes before the deadline, do not write new code — audit:

  1. WIDTHS: every multiplication or sum of maxima — is the widest expression long long?
  2. ORDER: for lazy tags and DP pulls, is the compose order the one you proved?
  3. BOUNDARIES: empty ranges, single elements, the root, the last character.
  4. INVARIANTS: state in one sentence what must stay true; find the test that would break it if false.

Submitting one minute EARLIER with a checked solution beats submitting a new idea at the buzzer.

⚡ Now practice

Ready to Code
Mixed Drill — Trees and StringsThree timed synthesis problems: Euler + BIT, border chains, and a binary trie.
3 challenges · · ~110 min