Longest attendance streak

days holds the day numbers on which a user checked in at a daily attendance event. The numbers are not necessarily in order, and if the user checked in several times on the same day, that day's number appears several times.

Complete the function solution, which returns the length, in days, of the longest period during which the user checked in every single day without missing one. If the user never checked in on two or more days in a row, return 1.

Function

solution(days)

Constraints

• The length of days is from 1 to 100,000.
• Each day number is an integer from 1 to 1,000,000,000.

Examples

Starter code

def solution(days):
    answer = 0
    return answer