mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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178 lines
16 KiB
JSON
178 lines
16 KiB
JSON
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"questionId": "150",
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"title": "Evaluate Reverse Polish Notation",
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"content": "<p>Evaluate the value of an arithmetic expression in <a href=\"http://en.wikipedia.org/wiki/Reverse_Polish_notation\" target=\"_blank\">Reverse Polish Notation</a>.</p>\n\n<p>Valid operators are <code>+</code>, <code>-</code>, <code>*</code>, and <code>/</code>. Each operand may be an integer or another expression.</p>\n\n<p><strong>Note</strong> that division between two integers should truncate toward zero.</p>\n\n<p>It is guaranteed that the given RPN expression is always valid. That means the expression would always evaluate to a result, and there will not be any division by zero operation.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> tokens = ["2","1","+","3","*"]\n<strong>Output:</strong> 9\n<strong>Explanation:</strong> ((2 + 1) * 3) = 9\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> tokens = ["4","13","5","/","+"]\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> (4 + (13 / 5)) = 6\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> tokens = ["10","6","9","3","+","-11","*","/","*","17","+","5","+"]\n<strong>Output:</strong> 22\n<strong>Explanation:</strong> ((10 * (6 / ((9 + 3) * -11))) + 17) + 5\n= ((10 * (6 / (12 * -11))) + 17) + 5\n= ((10 * (6 / -132)) + 17) + 5\n= ((10 * 0) + 17) + 5\n= (0 + 17) + 5\n= 17 + 5\n= 22\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= tokens.length <= 10<sup>4</sup></code></li>\n\t<li><code>tokens[i]</code> is either an operator: <code>"+"</code>, <code>"-"</code>, <code>"*"</code>, or <code>"/"</code>, or an integer in the range <code>[-200, 200]</code>.</li>\n</ul>\n",
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"exampleTestcases": "[\"2\",\"1\",\"+\",\"3\",\"*\"]\n[\"4\",\"13\",\"5\",\"/\",\"+\"]\n[\"10\",\"6\",\"9\",\"3\",\"+\",\"-11\",\"*\",\"/\",\"*\",\"17\",\"+\",\"5\",\"+\"]",
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"code": "-spec eval_rpn(Tokens :: [unicode:unicode_binary()]) -> integer().\neval_rpn(Tokens) ->\n .",
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