Introduction

In this blog post, we will explore how to solve the LeetCode problem "3280" using AI. LeetCode is a popular platform for preparing for coding interviews, and with the help of AI tools like Chatmagic, we can generate solutions quickly and efficiently - helping you pass the interviews and get the job offer without having to study for months.

Problem Statement

You are given a string date representing a Gregorian calendar date in the yyyy-mm-dd format. date can be written in its binary representation obtained by converting year, month, and day to their binary representations without any leading zeroes and writing them down in year-month-day format. Return the binary representation of date. Example 1: Input: date = "2080-02-29" Output: "100000100000-10-11101" Explanation: 100000100000, 10, and 11101 are the binary representations of 2080, 02, and 29 respectively. Example 2: Input: date = "1900-01-01" Output: "11101101100-1-1" Explanation: 11101101100, 1, and 1 are the binary representations of 1900, 1, and 1 respectively. Constraints: date.length == 10 date[4] == date[7] == '-', and all other date[i]'s are digits. The input is generated such that date represents a valid Gregorian calendar date between Jan 1st, 1900 and Dec 31st, 2100 (both inclusive).

Explanation

Here's the breakdown of the solution:

• Parsing the Date: Extract the year, month, and day as integers from the input string.
• Binary Conversion: Convert each integer (year, month, day) to its binary representation using a built-in or manual conversion method.

• String Formatting: Concatenate the binary representations with hyphens in the required "year-month-day" format.

• Runtime Complexity: O(1), Storage Complexity: O(1). The operations are limited to parsing a fixed-length string and converting small integers to binary, all bounded by constant time.

Code

    def date_to_binary(date: str) -> str:
    """
    Converts a date string in yyyy-mm-dd format to its binary representation.

    Args:
        date: The date string in yyyy-mm-dd format.

    Returns:
        The binary representation of the date in year-month-day format.
    """
    year = int(date[:4])
    month = int(date[5:7])
    day = int(date[8:])

    year_bin = bin(year)[2:]
    month_bin = bin(month)[2:]
    day_bin = bin(day)[2:]

    return f"{year_bin}-{month_bin}-{day_bin}"