LeetCode 2993: Friday Purchases I Solution

Master LeetCode problem 2993 (Friday Purchases I), a medium 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.

2993. Friday Purchases I

Medium

Database

Problem Explanation

Explanation:

To solve this problem, we can iterate through the list of purchases and calculate the total amount spent on Fridays. We can keep track of the total amount spent on each day of the week and return the sum of the amounts spent on Fridays.

Initialize a variable totalFridayAmount to 0 to keep track of the total amount spent on Fridays.
Iterate through the list of purchases.
For each purchase, check if it was made on a Friday (assuming Monday is the first day of the week).
If the purchase was made on a Friday, add the purchase amount to totalFridayAmount.
Finally, return totalFridayAmount.

Time Complexity:

The time complexity of this solution is O(N), where N is the number of purchases in the list.

Space Complexity:

The space complexity of this solution is O(1) as we are using a constant amount of extra space.

Solution Code

class Solution {
    public int fridayPurchases(int[] purchases) {
        int totalFridayAmount = 0;
        
        for (int purchase : purchases) {
            if (purchase % 7 == 4) { // Assuming Monday is the first day of the week
                totalFridayAmount += purchase;
            }
        }
        
        return totalFridayAmount;
    }
}

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