LeetCode 1479: Sales by Day of the Week Solution

Master LeetCode problem 1479 (Sales by Day of the Week), a hard challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

1479. Sales by Day of the Week

Hard

Database

Problem Explanation

Explanation

To solve this problem, we need to calculate the sales for each day of the week based on the given sales data. The input consists of a list of sales for each day of the month, and we need to calculate the total sales for each day of the week (Sunday to Saturday) for the entire month.

We can achieve this by iterating over the sales data and accumulating the sales amount for each day of the week. To map the days of the week to their corresponding index (0 for Sunday, 1 for Monday, ..., 6 for Saturday), we can use a mapping array or a simple formula.

Algorithm

Initialize an array weekSales of size 7 to store the total sales for each day of the week.
Iterate over the given sales array and for each day:
- Calculate the day of the week using the formula (startDay + i - 1) % 7, where startDay is the index of the start day of the month and i is the day index.
- Accumulate the sales amount for that day of the week in weekSales.
Return the weekSales array containing the total sales for each day of the week.

Time Complexity

The time complexity of this algorithm is O(N), where N is the number of days in the sales data.

Space Complexity

The space complexity of this algorithm is O(1) as we only use a fixed-size array to store the total sales for each day of the week.

Solution Code

class Solution {
    public int[] salesByDayOfWeek(int[] sales, int startDay) {
        int[] weekSales = new int[7];
        
        for (int i = 0; i < sales.length; i++) {
            int dayOfWeek = (startDay + i - 1) % 7;
            weekSales[dayOfWeek] += sales[i];
        }
        
        return weekSales;
    }
}

Try It Yourself

Loading code editor...

Frequently Asked Questions

How to solve LeetCode 1479 (Sales by Day of the Week)?

This page provides optimized solutions for LeetCode problem 1479 (Sales by Day of the Week) in Java, C++, and Python, along with a detailed explanation and an interactive code editor to test your code.

What is the time complexity of LeetCode 1479 (Sales by Day of the Week)?

The time complexity for LeetCode 1479 (Sales by Day of the Week) varies by solution. Check the detailed explanation section for specific complexities in Java, C++, and Python implementations.

Can I run code for LeetCode 1479 on DevExCode?

Yes, DevExCode provides an interactive code editor where you can write, test, and run your code for LeetCode 1479 in Java, C++, or Python.

Back to LeetCode Solutions