How should I practice Is a Power of Ten?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Goldman Sachs phone screen problems in FastPrep.

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Is a Power of Ten

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Problem statement

Given a signed integer n, return true exactly when n = 10^k for some nonnegative integer k.

1 is a power of ten because 10^0 = 1. Zero and negative integers are not powers of ten.

Function

isPowerOfTen(n: long) → boolean

Examples

Example 1

n = 1000return = true

1000 equals 10 cubed.

Example 2

n = 120return = false

120 is not an integer power of ten.

Example 3

n = 1return = true

The exponent may be zero.

Constraints

-10^18 <= n <= 10^18.