mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-11 02:58:13 +08:00
174 lines
20 KiB
JSON
174 lines
20 KiB
JSON
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"title": "Basic Calculator II",
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"content": "<p>Given a string <code>s</code> which represents an expression, <em>evaluate this expression and return its value</em>. </p>\n\n<p>The integer division should truncate toward zero.</p>\n\n<p>You may assume that the given expression is always valid. All intermediate results will be in the range of <code>[-2<sup>31</sup>, 2<sup>31</sup> - 1]</code>.</p>\n\n<p><strong>Note:</strong> You are not allowed to use any built-in function which evaluates strings as mathematical expressions, such as <code>eval()</code>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<pre><strong>Input:</strong> s = \"3+2*2\"\n<strong>Output:</strong> 7\n</pre><p><strong>Example 2:</strong></p>\n<pre><strong>Input:</strong> s = \" 3/2 \"\n<strong>Output:</strong> 1\n</pre><p><strong>Example 3:</strong></p>\n<pre><strong>Input:</strong> s = \" 3+5 / 2 \"\n<strong>Output:</strong> 5\n</pre>\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 3 * 10<sup>5</sup></code></li>\n\t<li><code>s</code> consists of integers and operators <code>('+', '-', '*', '/')</code> separated by some number of spaces.</li>\n\t<li><code>s</code> represents <strong>a valid expression</strong>.</li>\n\t<li>All the integers in the expression are non-negative integers in the range <code>[0, 2<sup>31</sup> - 1]</code>.</li>\n\t<li>The answer is <strong>guaranteed</strong> to fit in a <strong>32-bit integer</strong>.</li>\n</ul>\n",
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