How do you communicate time/space complexity clearly in a live coding round?

Communicating complexity

• State time and auxiliary space after agreeing on n.
• Mention dominant term—drop constants and lower orders.
• Relate to constraints: n=10⁵ → need O(n log n) or O(n).
• Walk a tiny example while coding.

// After coding binary search:
// "n = array length, each step halves range → O(log n) time, O(1) extra space."