leetcode-problemset/leetcode-cn/originData/count-common-words-with-one-occurrence.json

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        "question": {
            "questionId": "2190",
            "questionFrontendId": "2085",
            "categoryTitle": "Algorithms",
            "boundTopicId": 1121046,
            "title": "Count Common Words With One Occurrence",
            "titleSlug": "count-common-words-with-one-occurrence",
            "content": "<p>Given two string arrays <code>words1</code> and <code>words2</code>, return <em>the number of strings that appear <strong>exactly once</strong> in <b>each</b>&nbsp;of the two arrays.</em></p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> words1 = [&quot;leetcode&quot;,&quot;is&quot;,&quot;amazing&quot;,&quot;as&quot;,&quot;is&quot;], words2 = [&quot;amazing&quot;,&quot;leetcode&quot;,&quot;is&quot;]\n<strong>Output:</strong> 2\n<strong>Explanation:</strong>\n- &quot;leetcode&quot; appears exactly once in each of the two arrays. We count this string.\n- &quot;amazing&quot; appears exactly once in each of the two arrays. We count this string.\n- &quot;is&quot; appears in each of the two arrays, but there are 2 occurrences of it in words1. We do not count this string.\n- &quot;as&quot; appears once in words1, but does not appear in words2. We do not count this string.\nThus, there are 2 strings that appear exactly once in each of the two arrays.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> words1 = [&quot;b&quot;,&quot;bb&quot;,&quot;bbb&quot;], words2 = [&quot;a&quot;,&quot;aa&quot;,&quot;aaa&quot;]\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> There are no strings that appear in each of the two arrays.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> words1 = [&quot;a&quot;,&quot;ab&quot;], words2 = [&quot;a&quot;,&quot;a&quot;,&quot;a&quot;,&quot;ab&quot;]\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> The only string that appears exactly once in each of the two arrays is &quot;ab&quot;.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= words1.length, words2.length &lt;= 1000</code></li>\n\t<li><code>1 &lt;= words1[i].length, words2[j].length &lt;= 30</code></li>\n\t<li><code>words1[i]</code> and <code>words2[j]</code> consists only of lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "统计出现过一次的公共字符串",
            "translatedContent": "<p>给你两个字符串数组&nbsp;<code>words1</code>&nbsp;和&nbsp;<code>words2</code>&nbsp;，请你返回在两个字符串数组中 <strong>都恰好出现一次</strong>&nbsp;的字符串的数目。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<b>输入：</b>words1 = [\"leetcode\",\"is\",\"amazing\",\"as\",\"is\"], words2 = [\"amazing\",\"leetcode\",\"is\"]\n<b>输出：</b>2\n<strong>解释：</strong>\n- \"leetcode\" 在两个数组中都恰好出现一次，计入答案。\n- \"amazing\" 在两个数组中都恰好出现一次，计入答案。\n- \"is\" 在两个数组中都出现过，但在 words1 中出现了 2 次，不计入答案。\n- \"as\" 在 words1 中出现了一次，但是在 words2 中没有出现过，不计入答案。\n所以，有 2 个字符串在两个数组中都恰好出现了一次。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<b>输入：</b>words1 = [\"b\",\"bb\",\"bbb\"], words2 = [\"a\",\"aa\",\"aaa\"]\n<b>输出：</b>0\n<b>解释：</b>没有字符串在两个数组中都恰好出现一次。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<b>输入：</b>words1 = [\"a\",\"ab\"], words2 = [\"a\",\"a\",\"a\",\"ab\"]\n<b>输出：</b>1\n<b>解释：</b>唯一在两个数组中都出现一次的字符串是 \"ab\" 。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= words1.length, words2.length &lt;= 1000</code></li>\n\t<li><code>1 &lt;= words1[i].length, words2[j].length &lt;= 30</code></li>\n\t<li><code>words1[i]</code> 和&nbsp;<code>words2[j]</code>&nbsp;都只包含小写英文字母。</li>\n</ul>\n",
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            "hints": [
                "Could you try every word?",
                "Could you use a hash map to achieve a good complexity?"
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