How do you solve Sum of Numbers With Units Digit K on LeetCode?

Sum of Numbers With Units Digit K (LeetCode #2310) can be solved using Brute Force. The optimal approach is Brute Force with undefined time complexity and undefined space complexity. Key insight: The brute force approach explores all possible combinations of integers that end with the digit k to see if they can sum up to num. This is straightforward but inefficient, as it can involve many unnecessary calculations.

What is the time complexity of Sum of Numbers With Units Digit K?

The optimal solution for Sum of Numbers With Units Digit K runs in undefined time and uses undefined space. undefined

What algorithm or data structure is used to solve Sum of Numbers With Units Digit K?

Sum of Numbers With Units Digit K uses the following concepts: Math, Dynamic Programming, Greedy, Enumeration. The recommended patterns to study are: .

#2310

Sum of Numbers With Units Digit K

Medium

MathDynamic ProgrammingGreedyEnumeration

LeetCode ↗

Approaches

💡

Intuition

Time Space

The brute force approach explores all possible combinations of integers that end with the digit k to see if they can sum up to num. This is straightforward but inefficient, as it can involve many unnecessary calculations.

⚙️

Algorithm

3 steps

1Step 1: Initialize a counter for the number of integers used.
2Step 2: Start from the smallest integer with units digit k and keep adding it to the sum until it exceeds num.
3Step 3: If the sum equals num, return the count of integers used; if it exceeds num, try the next larger integer with units digit k.

solution.py18 lines

1# Full working Python code
2
3def min_set_size(num, k):
4    if num == 0:
5        return 0
6    count = 0
7    current_sum = 0
8    current_number = k
9    while current_sum < num:
10        current_sum += current_number
11        count += 1
12        if current_sum == num:
13            return count
14        current_number += 10
15    return -1
16
17# Example usage
18print(min_set_size(58, 9))  # Output: 2

Solutions and explanations are original Tejav content. Problem titles © LeetCode — use the LeetCode button above for the full problem statement.