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Problem · Math

Sum Digits Until One

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● Easy

Capital OneFULLTIMEOA

Problem statement

Given a list of strings representing numbers, repeatedly sum the digits of each number until it becomes a single-digit value. Return the mode of the resulting single-digit values.

The input is guaranteed to have a unique mode after all numbers are reduced to one digit.

For example, ["1234", "24", "33"] becomes ["10", "6", "6"], then ["1", "6", "6"], so the result is 6.

Complete sumDigitsUntilOne, which receives List<String> numbers and returns the unique modal single-digit value as an int.

Function

sumDigitsUntilOne(numbers: List<String>) → int

Examples

Example 1

numbers = ["1234", "24", "33"]return = 6

The process of summing the digits repeatedly until a single-digit number is obtained is as follows:

1234 → 1+2+3+4 = 10 → 1+0 = 1
24 → 2+4 = 6
33 → 3+3 = 6

The resulting single-digit numbers are 1, 6, and 6. The mode of these numbers is 6.

Problem statement

Function

Examples

Example 1

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