How should I practice Root Mean Square Error?

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

Is Root Mean Square Error associated with Waabi?

FastPrep tags this as a Waabi phone screen coding practice problem when the problem catalog has that company and stage context.

Root Mean Square Error

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Problem statement

Given equal-length arrays of predicted and actual integer values, compute the root mean square error: the square root of the mean of the squared pairwise differences. Return the result rounded to exactly six digits after the decimal point.

Function

rootMeanSquareError(predicted: int[], actual: int[]) → String

Examples

Example 1

predicted = [1,2,3]actual = [1,2,3]return = "0.000000"

All differences are zero.

Example 2

predicted = [2,4]actual = [0,0]return = "3.162278"

The mean squared error is ten, whose square root is approximately 3.16227766.

Constraints

1 <= predicted.length = actual.length <= 100000
|predicted[i]|, |actual[i]| <= 100000

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