Problem 44668. Day counter function

Write a function called day_counter that returns the number of Mondays that fell on the first day of the month in a given year between 1776 and 2016 inclusive where the requested year is the only input to your function and it is a positive integer scalar. Note that a leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400. In a leap year, February has 29 days.
You are not allowed to use the datenum built-in function.
(Inspired by Project Euler.)
Solve

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70.59% Correct | 29.41% Incorrect
Last Solution submitted on Jul 18, 2025

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