Count Odd Numbers in an Interval Range
<p>Given two non-negative integers <code>low</code> and <code><font face="monospace">high</font></code>. Return the <em>count of odd numbers between </em><code>low</code><em> and </em><code><font face="monospace">high</font></code><em>&nbsp;(inclusive)</em>.</p>

<p>&nbsp;</p>

<p><strong class="example">Example 1:</strong></p>

<pre>

<strong>Input:</strong> low = 3, high = 7

<strong>Output:</strong> 3

<b>Explanation: </b>The odd numbers between 3 and 7 are [3,5,7].</pre>

<p><strong class="example">Example 2:</strong></p>

<pre>

<strong>Input:</strong> low = 8, high = 10

<strong>Output:</strong> 1

<b>Explanation: </b>The odd numbers between 8 and 10 are [9].</pre>

<p>&nbsp;</p>

<p><strong>Constraints:</strong></p>

<ul>

    <li><code>0 &lt;= low &lt;= high&nbsp;&lt;= 10^9</code></li>

</ul>
Math
func countOdds(low int, high int) int {
	return ((high + 1) >> 1) - (low >> 1)
}