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<p>表达式仅包含非负整数,<code>+</code>, <code>-</code> ,<code>*</code>,<code>/</code> 四种运算符和空格 <code> </code>。 整数除法仅保留整数部分。</p>
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<p><strong>示例 1:</strong></p>
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<p><strong>示例 1:</strong></p>
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<pre><strong>输入: </strong>"3+2*2"
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<strong>输出:</strong> 7
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<pre>
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<strong>输入:</strong>"3+2*2"
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<strong>输出:</strong>7
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</pre>
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<p><strong>示例 2:</strong></p>
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<p><strong>示例 2:</strong></p>
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<pre><strong>输入:</strong> " 3/2 "
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<strong>输出:</strong> 1</pre>
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<pre>
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<strong>输入:</strong>" 3/2 "
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<strong>输出:</strong>1</pre>
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<p><strong>示例 3:</strong></p>
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<p><strong>示例 3:</strong></p>
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<pre><strong>输入:</strong> " 3+5 / 2 "
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<strong>输出:</strong> 5
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<pre>
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<strong>输入:</strong>" 3+5 / 2 "
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<strong>输出:</strong>5
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</pre>
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<p><strong>说明:</strong></p>
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