How should I practice Average Process Time from CSV?

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Average Process Time from CSV

Abnormal Security● EasyFULLTIMEPHONE SCREEN

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Problem statement

Each CSV row has the form id,start,end, where start and end are integer timestamps and end >= start. Group rows by id and return each ID's average process duration end - start.

Return rows [id, average] sorted lexicographically by ID. The input guarantees every average is an integer.

Function

averageProcessTimes(rows: String[]) → String[][]

Examples

Example 1

rows = ["a,10,20","b,0,4","a,30,50"]return = [["a","15"],["b","4"]]

ID a has durations 10 and 20, whose average is 15.

Constraints

1 <= rows.length <= 100000.
IDs are nonempty ASCII strings without commas.
0 <= start <= end <= 10^9.
Each per-ID duration sum is divisible by its row count.