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FastPrep

Problem · Math

Sum Digits Until One

● EasyCapital OneFULLTIMEOA

Given a list, for each element in the list, repeatedly sum the digits until it becomes a single-digit number. Then return the mode of the resulting numbers.

For example: ['1234', '24', '33'] → ['10', '6', '6'] → ['1', '6', '6'] So the result is 6.

Function Description

Complete the function sumDigitsUntilOne in the editor.

sumDigitsUntilOne has the following parameter:

List numbers: a list of strings representing numbers

Returns

int: the mode of the single-digit numbers obtained by repeatedly summing the digits

Examples

01 · 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.