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Micro-Drill #122 — Check if power of two

Interval & Math Target: 5s

Single-bit check via n & (n-1) == 0. Fastest power-of-two test.

n > 0 and n & (n - 1) == 0

Type it from memory. Go.

Practice Problems

• 231. Power of Two
• 342. Power of Four

Related Coding Drills

• Drill #84 — Power of two Easy