sum-of-numbers-with-units-digit-k

Sum of Numbers With Units Digit K

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minimumNumbers

Given two integers <code>num</code> and <code>k</code>, consider a set of positive integers with the following properties:

<ul>
	<li>The units digit of each integer is <code>k</code>.</li>
	<li>The sum of the integers is <code>num</code>.</li>
</ul>

Return the minimum possible size of such a set, or <code>-1</code> if no such set exists.

Note:

<ul>
	<li>The set can contain multiple instances of the same integer, and the sum of an empty set is considered <code>0</code>.</li>
	<li>The units digit of a number is the rightmost digit of the number.</li>
</ul>

&nbsp;
Example 1:

<pre>
Input: num = 58, k = 9
Output: 2
Explanation:
One valid set is [9,49], as the sum is 58 and each integer has a units digit of 9.
Another valid set is [19,39].
It can be shown that 2 is the minimum possible size of a valid set.
</pre>

Example 2:

<pre>
Input: num = 37, k = 2
Output: -1
Explanation: It is not possible to obtain a sum of 37 using only integers that have a units digit of 2.
</pre>

Example 3:

<pre>
Input: num = 0, k = 7
Output: 0
Explanation: The sum of an empty set is considered 0.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>0 &lt;= num &lt;= 3000</code></li>
	<li><code>0 &lt;= k &lt;= 9</code></li>
</ul>

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