<p><strong>不使用</strong>运算符&nbsp;<code>+</code> 和&nbsp;<code>-</code>&nbsp;​​​​​​​，计算两整数&nbsp;​​​​​​​<code>a</code>&nbsp;、<code>b</code>&nbsp;​​​​​​​之和。</p>

<p><strong>示例 1:</strong></p>

<pre><strong>输入: </strong>a = 1, b = 2
<strong>输出: </strong>3
</pre>

<p><strong>示例 2:</strong></p>

<pre><strong>输入: </strong>a = -2, b = 3
<strong>输出: </strong>1</pre>
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