LeetCode 2310: Sum of Numbers With Units Digit K Solution

Master LeetCode problem 2310 (Sum of Numbers With Units Digit K), 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.

2310. Sum of Numbers With Units Digit K

Medium

Math Dynamic Programming Greedy Enumeration

Problem Explanation

Explanation:

To solve this problem, we can iterate through all possible sizes of the set starting from 1. For each size, we can calculate the sum of the set and check if it equals the given num. If it does, we return the size of the set. Otherwise, we return -1 if no valid set is found within the constraints.

Start from a set size of 1 and keep increasing the size until we find a valid set or reach the upper limit.
For each size, generate all possible combinations of numbers with units digit k and check if the sum equals num.
Return the size of the set if a valid set is found, otherwise return -1.

Time Complexity: O(10 * num) = O(num)
Space Complexity: O(1)

Solution Code

class Solution {
    public int minimumSizeSet(int num, int k) {
        for (int size = 1; size <= num; size++) {
            int sum = size * k;
            if (sum == num) {
                return size;
            }
        }
        return -1;
    }
}

Try It Yourself

Loading code editor...

Frequently Asked Questions

How to solve LeetCode 2310 (Sum of Numbers With Units Digit K)?

This page provides optimized solutions for LeetCode problem 2310 (Sum of Numbers With Units Digit K) 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 2310 (Sum of Numbers With Units Digit K)?

The time complexity for LeetCode 2310 (Sum of Numbers With Units Digit K) varies by solution. Check the detailed explanation section for specific complexities in Java, C++, and Python implementations.

Can I run code for LeetCode 2310 on DevExCode?

Yes, DevExCode provides an interactive code editor where you can write, test, and run your code for LeetCode 2310 in Java, C++, or Python.

Back to LeetCode Solutions