leetcode-problemset/leetcode-cn/originData/vlzXQL.json

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            "questionId": "1000305",
            "questionFrontendId": "LCR 111",
            "categoryTitle": "Algorithms",
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            "title": "除法求值",
            "titleSlug": "vlzXQL",
            "content": "<p>English description is not available for the problem. Please switch to Chinese.</p>\n",
            "translatedTitle": "除法求值",
            "translatedContent": "<p>给定一个变量对数组 <code>equations</code> 和一个实数值数组 <code>values</code> 作为已知条件，其中 <code>equations[i] = [A<sub>i</sub>, B<sub>i</sub>]</code> 和 <code>values[i]</code> 共同表示等式 <code>A<sub>i</sub> / B<sub>i</sub> = values[i]</code> 。每个 <code>A<sub>i</sub></code> 或 <code>B<sub>i</sub></code> 是一个表示单个变量的字符串。</p>\n\n<p>另有一些以数组 <code>queries</code> 表示的问题，其中 <code>queries[j] = [C<sub>j</sub>, D<sub>j</sub>]</code> 表示第 <code>j</code> 个问题，请你根据已知条件找出 <code>C<sub>j</sub> / D<sub>j</sub> = ?</code> 的结果作为答案。</p>\n\n<p>返回 <strong>所有问题的答案</strong> 。如果存在某个无法确定的答案，则用 <code>-1.0</code> 替代这个答案。如果问题中出现了给定的已知条件中没有出现的字符串，也需要用 <code>-1.0</code> 替代这个答案。</p>\n\n<p><strong>注意：</strong>输入总是有效的。可以假设除法运算中不会出现除数为 0 的情况，且不存在任何矛盾的结果。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>equations = [[&quot;a&quot;,&quot;b&quot;],[&quot;b&quot;,&quot;c&quot;]], values = [2.0,3.0], queries = [[&quot;a&quot;,&quot;c&quot;],[&quot;b&quot;,&quot;a&quot;],[&quot;a&quot;,&quot;e&quot;],[&quot;a&quot;,&quot;a&quot;],[&quot;x&quot;,&quot;x&quot;]]\n<strong>输出：</strong>[6.00000,0.50000,-1.00000,1.00000,-1.00000]\n<strong>解释：</strong>\n条件：<em>a / b = 2.0</em>, <em>b / c = 3.0</em>\n问题：<em>a / c = ?</em>, <em>b / a = ?</em>, <em>a / e = ?</em>, <em>a / a = ?</em>, <em>x / x = ?</em>\n结果：[6.0, 0.5, -1.0, 1.0, -1.0 ]\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>equations = [[&quot;a&quot;,&quot;b&quot;],[&quot;b&quot;,&quot;c&quot;],[&quot;bc&quot;,&quot;cd&quot;]], values = [1.5,2.5,5.0], queries = [[&quot;a&quot;,&quot;c&quot;],[&quot;c&quot;,&quot;b&quot;],[&quot;bc&quot;,&quot;cd&quot;],[&quot;cd&quot;,&quot;bc&quot;]]\n<strong>输出：</strong>[3.75000,0.40000,5.00000,0.20000]\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>equations = [[&quot;a&quot;,&quot;b&quot;]], values = [0.5], queries = [[&quot;a&quot;,&quot;b&quot;],[&quot;b&quot;,&quot;a&quot;],[&quot;a&quot;,&quot;c&quot;],[&quot;x&quot;,&quot;y&quot;]]\n<strong>输出：</strong>[0.50000,2.00000,-1.00000,-1.00000]\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= equations.length &lt;= 20</code></li>\n\t<li><code>equations[i].length == 2</code></li>\n\t<li><code>1 &lt;= A<sub>i</sub>.length, B<sub>i</sub>.length &lt;= 5</code></li>\n\t<li><code>values.length == equations.length</code></li>\n\t<li><code>0.0 &lt; values[i] &lt;= 20.0</code></li>\n\t<li><code>1 &lt;= queries.length &lt;= 20</code></li>\n\t<li><code>queries[i].length == 2</code></li>\n\t<li><code>1 &lt;= C<sub>j</sub>.length, D<sub>j</sub>.length &lt;= 5</code></li>\n\t<li><code>A<sub>i</sub>, B<sub>i</sub>, C<sub>j</sub>, D<sub>j</sub></code> 由小写英文字母与数字组成</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><meta charset=\"UTF-8\" />注意：本题与主站 399&nbsp;题相同：&nbsp;<a href=\"https://leetcode-cn.com/problems/evaluate-division/\">https://leetcode-cn.com/problems/evaluate-division/</a></p>\n",
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