leetcode-problemset/leetcode-cn/originData/print-foobar-alternately.json

{
    "data": {
        "question": {
            "questionId": "1187",
            "questionFrontendId": "1115",
            "categoryTitle": "Concurrency",
            "boundTopicId": 11554,
            "title": "Print FooBar Alternately",
            "titleSlug": "print-foobar-alternately",
            "content": "<p>Suppose you are given the following code:</p>\n\n<pre>\nclass FooBar {\n  public void foo() {\n    for (int i = 0; i &lt; n; i++) {\n      print(&quot;foo&quot;);\n    }\n  }\n\n  public void bar() {\n    for (int i = 0; i &lt; n; i++) {\n      print(&quot;bar&quot;);\n    }\n  }\n}\n</pre>\n\n<p>The same instance of <code>FooBar</code> will be passed to two different threads:</p>\n\n<ul>\n\t<li>thread <code>A</code> will call <code>foo()</code>, while</li>\n\t<li>thread <code>B</code> will call <code>bar()</code>.</li>\n</ul>\n\n<p>Modify the given program to output <code>&quot;foobar&quot;</code> <code>n</code> times.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 1\n<strong>Output:</strong> &quot;foobar&quot;\n<strong>Explanation:</strong> There are two threads being fired asynchronously. One of them calls foo(), while the other calls bar().\n&quot;foobar&quot; is being output 1 time.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 2\n<strong>Output:</strong> &quot;foobarfoobar&quot;\n<strong>Explanation:</strong> &quot;foobar&quot; is being output 2 times.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 1000</code></li>\n</ul>\n",
            "translatedTitle": "交替打印 FooBar",
            "translatedContent": "<p>给你一个类：</p>\n\n<pre>\nclass FooBar {\n  public void foo() {\n&nbsp; &nbsp; for (int i = 0; i &lt; n; i++) {\n&nbsp; &nbsp; &nbsp; print(\"foo\");\n&nbsp;   }\n  }\n\n  public void bar() {\n&nbsp; &nbsp; for (int i = 0; i &lt; n; i++) {\n&nbsp; &nbsp; &nbsp; print(\"bar\");\n&nbsp; &nbsp; }\n  }\n}\n</pre>\n\n<p>两个不同的线程将会共用一个 <code>FooBar</code>&nbsp;实例：</p>\n\n<ul>\n\t<li>线程 A 将会调用&nbsp;<code>foo()</code>&nbsp;方法，而</li>\n\t<li>线程 B 将会调用&nbsp;<code>bar()</code>&nbsp;方法</li>\n</ul>\n\n<p>请设计修改程序，以确保 <code>\"foobar\"</code> 被输出 <code>n</code> 次。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>n = 1\n<strong>输出：</strong>\"foobar\"\n<strong>解释：</strong>这里有两个线程被异步启动。其中一个调用 foo() 方法, 另一个调用 bar() 方法，\"foobar\" 将被输出一次。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>n = 2\n<strong>输出：</strong>\"foobarfoobar\"\n<strong>解释：</strong>\"foobar\" 将被输出两次。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 1000</code></li>\n</ul>\n",
            "isPaidOnly": false,
            "difficulty": "Medium",
            "likes": 157,
            "dislikes": 0,
            "isLiked": null,
            "similarQuestions": "[{\"title\": \"Print in Order\", \"titleSlug\": \"print-in-order\", \"difficulty\": \"Easy\", \"translatedTitle\": \"\\u6309\\u5e8f\\u6253\\u5370\"}, {\"title\": \"Print Zero Even Odd\", \"titleSlug\": \"print-zero-even-odd\", \"difficulty\": \"Medium\", \"translatedTitle\": \"\\u6253\\u5370\\u96f6\\u4e0e\\u5947\\u5076\\u6570\"}]",
            "contributors": [],
            "langToValidPlayground": "{\"cpp\": true, \"java\": true, \"python\": true, \"python3\": true, \"mysql\": false, \"mssql\": false, \"oraclesql\": false, \"c\": false, \"csharp\": false, \"javascript\": false, \"ruby\": false, \"bash\": false, \"swift\": false, \"golang\": false, \"scala\": false, \"html\": false, \"pythonml\": false, \"kotlin\": false, \"rust\": false, \"php\": false, \"typescript\": false, \"racket\": false, \"erlang\": false, \"elixir\": false}",
            "topicTags": [
                {
                    "name": "Concurrency",
                    "slug": "concurrency",
                    "translatedName": "多线程",
                    "__typename": "TopicTagNode"
                }
            ],
            "companyTagStats": null,
            "codeSnippets": [
                {
                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class FooBar {\nprivate:\n    int n;\n\npublic:\n    FooBar(int n) {\n        this->n = n;\n    }\n\n    void foo(function<void()> printFoo) {\n        \n        for (int i = 0; i < n; i++) {\n            \n        \t// printFoo() outputs \"foo\". Do not change or remove this line.\n        \tprintFoo();\n        }\n    }\n\n    void bar(function<void()> printBar) {\n        \n        for (int i = 0; i < n; i++) {\n            \n        \t// printBar() outputs \"bar\". Do not change or remove this line.\n        \tprintBar();\n        }\n    }\n};",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class FooBar {\n    private int n;\n\n    public FooBar(int n) {\n        this.n = n;\n    }\n\n    public void foo(Runnable printFoo) throws InterruptedException {\n        \n        for (int i = 0; i < n; i++) {\n            \n        \t// printFoo.run() outputs \"foo\". Do not change or remove this line.\n        \tprintFoo.run();\n        }\n    }\n\n    public void bar(Runnable printBar) throws InterruptedException {\n        \n        for (int i = 0; i < n; i++) {\n            \n            // printBar.run() outputs \"bar\". Do not change or remove this line.\n        \tprintBar.run();\n        }\n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class FooBar(object):\n    def __init__(self, n):\n        self.n = n\n\n\n    def foo(self, printFoo):\n        \"\"\"\n        :type printFoo: method\n        :rtype: void\n        \"\"\"\n        for i in xrange(self.n):\n            \n            # printFoo() outputs \"foo\". Do not change or remove this line.\n        \tprintFoo()\n\n\n    def bar(self, printBar):\n        \"\"\"\n        :type printBar: method\n        :rtype: void\n        \"\"\"\n        for i in xrange(self.n):\n            \n            # printBar() outputs \"bar\". Do not change or remove this line.\n        \tprintBar()",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "class FooBar:\n    def __init__(self, n):\n        self.n = n\n\n\n    def foo(self, printFoo: 'Callable[[], None]') -> None:\n        \n        for i in range(self.n):\n            \n            # printFoo() outputs \"foo\". Do not change or remove this line.\n        \tprintFoo()\n\n\n    def bar(self, printBar: 'Callable[[], None]') -> None:\n        \n        for i in range(self.n):\n            \n            # printBar() outputs \"bar\". Do not change or remove this line.\n        \tprintBar()",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C",
                    "langSlug": "c",
                    "code": "typedef struct {\n    int n;\n} FooBar;\n\nFooBar* fooBarCreate(int n) {\n    FooBar* obj = (FooBar*) malloc(sizeof(FooBar));\n    obj->n = n;\n    return obj;\n}\n\nvoid foo(FooBar* obj) {\n    \n    for (int i = 0; i < obj->n; i++) {\n        \n        // printFoo() outputs \"foo\". Do not change or remove this line.\n        printFoo();\n    }\n}\n\nvoid bar(FooBar* obj) {\n    \n    for (int i = 0; i < obj->n; i++) {\n        \n        // printBar() outputs \"bar\". Do not change or remove this line.\n        printBar();\n    }\n}\n\nvoid fooBarFree(FooBar* obj) {\n    \n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class FooBar {\n    private int n;\n\n    public FooBar(int n) {\n        this.n = n;\n    }\n\n    public void Foo(Action printFoo) {\n        \n        for (int i = 0; i < n; i++) {\n            \n        \t// printFoo() outputs \"foo\". Do not change or remove this line.\n        \tprintFoo();\n        }\n    }\n\n    public void Bar(Action printBar) {\n        \n        for (int i = 0; i < n; i++) {\n            \n            // printBar() outputs \"bar\". Do not change or remove this line.\n        \tprintBar();\n        }\n    }\n}",
                    "__typename": "CodeSnippetNode"
                }
            ],
            "stats": "{\"totalAccepted\": \"51.2K\", \"totalSubmission\": \"91K\", \"totalAcceptedRaw\": 51203, \"totalSubmissionRaw\": 91029, \"acRate\": \"56.2%\"}",
            "hints": [],
            "solution": null,
            "status": null,
            "sampleTestCase": "1",
            "metaData": "{\n  \"name\": \"FooBar\",\n  \"params\": [\n    {\n      \"name\": \"n\",\n      \"type\": \"integer\"\n    }\n  ],\n  \"return\": {\n    \"type\": \"integer\"\n  },\n  \"languages\": [\n    \"java\",\n    \"cpp\",\n    \"python\",\n    \"c\",\n    \"python3\",\n    \"csharp\"\n  ],\n  \"manual\": true\n}",
            "judgerAvailable": true,
            "judgeType": "large",
            "mysqlSchemas": [],
            "enableRunCode": true,
            "envInfo": "{\"cpp\":[\"C++\",\"<p>\\u7248\\u672c\\uff1a<code>clang 11<\\/code> \\u91c7\\u7528\\u6700\\u65b0C++ 17\\u6807\\u51c6\\u3002<\\/p>\\r\\n\\r\\n<p>\\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528<code>-O2<\\/code>\\u7ea7\\u4f18\\u5316\\u3002<a href=\\\"https:\\/\\/github.com\\/google\\/sanitizers\\/wiki\\/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer<\\/a> \\u4e5f\\u88ab\\u5f00\\u542f\\u6765\\u68c0\\u6d4b<code>out-of-bounds<\\/code>\\u548c<code>use-after-free<\\/code>\\u9519\\u8bef\\u3002<\\/p>\\r\\n\\r\\n<p>\\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\"],\"java\":[\"Java\",\"<p>\\u7248\\u672c\\uff1a<code>OpenJDK 17<\\/code>\\u3002\\u53ef\\u4ee5\\u4f7f\\u7528Java 8\\u7684\\u7279\\u6027\\u4f8b\\u5982\\uff0clambda expressions \\u548c stream API\\u3002<\\/p>\\r\\n\\r\\n<p>\\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u88ab\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n<p>\\u5305\\u542b Pair \\u7c7b: https:\\/\\/docs.oracle.com\\/javase\\/8\\/javafx\\/api\\/javafx\\/util\\/Pair.html <\\/p>\"],\"python\":[\"Python\",\"<p>\\u7248\\u672c\\uff1a <code>Python 2.7.12<\\/code><\\/p>\\r\\n\\r\\n<p>\\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u5e38\\u7528\\u5e93\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8 \\u5bfc\\u5165\\uff0c\\u5982\\uff1a<a href=\\\"https:\\/\\/docs.python.org\\/2\\/library\\/array.html\\\" target=\\\"_blank\\\">array<\\/a>, <a href=\\\"https:\\/\\/docs.python.org\\/2\\/library\\/bisect.html\\\" target=\\\"_blank\\\">bisect<\\/a>, <a href=\\\"https:\\/\\/docs.python.org\\/2\\/library\\/collections.html\\\" target=\\\"_blank\\\">collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n<p>\\u6ce8\\u610f Python 2.7 <a href=\\\"https:\\/\\/www.python.org\\/dev\\/peps\\/pep-0373\\/\\\" target=\\\"_blank\\\">\\u5c06\\u57282020\\u5e74\\u540e\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\"<p>\\u7248\\u672c\\uff1a<code>GCC 8.2<\\/code>\\uff0c\\u91c7\\u7528GNU99\\u6807\\u51c6\\u3002<\\/p>\\r\\n\\r\\n<p>\\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528<code>-O1<\\/code>\\u7ea7\\u4f18\\u5316\\u3002 <a href=\\\"https:\\/\\/github.com\\/google\\/sanitizers\\/wiki\\/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer<\\/a>\\u4e5f\\u88ab\\u5f00\\u542f\\u6765\\u68c0\\u6d4b<code>out-of-bounds<\\/code>\\u548c<code>use-after-free<\\/code>\\u9519\\u8bef\\u3002<\\/p>\\r\\n\\r\\n<p>\\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n<p>\\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 <a href=\\\"https:\\/\\/troydhanson.github.io\\/uthash\\/\\\" target=\\\"_blank\\\">uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n<p><b>1. \\u5f80\\u54c8\\u5e0c\\u8868\\u4e2d\\u6dfb\\u52a0\\u4e00\\u4e2a\\u5bf9\\u8c61\\uff1a<\\/b>\\r\\n<pre>\\r\\nstruct hash_entry {\\r\\n    int id;            \\/* we'll use this field as the key *\\/\\r\\n    char name[10];\\r\\n    UT_hash_handle hh; \\/* makes this structure hashable *\\/\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n    HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n<\\/pre>\\r\\n<\\/p>\\r\\n\\r\\n<p><b>2. \\u5728\\u54c8\\u5e0c\\u8868\\u4e2d\\u67e5\\u627e\\u4e00\\u4e2a\\u5bf9\\u8c61\\uff1a<\\/b>\\r\\n<pre>\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n    struct hash_entry *s;\\r\\n    HASH_FIND_INT(users, &user_id, s);\\r\\n    return s;\\r\\n}\\r\\n<\\/pre>\\r\\n<\\/p>\\r\\n\\r\\n<p><b>3. \\u4ece\\u54c8\\u5e0c\\u8868\\u4e2d\\u5220\\u9664\\u4e00\\u4e2a\\u5bf9\\u8c61\\uff1a<\\/b>\\r\\n<pre>\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n    HASH_DEL(users, user);  \\r\\n}\\r\\n<\\/pre>\\r\\n<\\/p>\"],\"csharp\":[\"C#\",\"<p><a href=\\\"https:\\/\\/docs.microsoft.com\\/en-us\\/dotnet\\/csharp\\/whats-new\\/csharp-9\\\" target=\\\"_blank\\\">C# 10<\\/a> \\u8fd0\\u884c\\u5728 .NET 6 \\u4e0a<\\/p>\\r\\n\\r\\n<p>\\u60a8\\u7684\\u4ee3\\u7801\\u5728\\u7f16\\u8bd1\\u65f6\\u9ed8\\u8ba4\\u5f00\\u542f\\u4e86debug\\u6807\\u8bb0(<code>\\/debug:pdbonly<\\/code>)\\u3002<\\/p>\"],\"python3\":[\"Python3\",\"<p>\\u7248\\u672c\\uff1a<code>Python 3.10<\\/code><\\/p>\\r\\n\\r\\n<p>\\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u5e38\\u7528\\u5e93\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8 \\u5bfc\\u5165\\uff0c\\u5982<a href=\\\"https:\\/\\/docs.python.org\\/3\\/library\\/array.html\\\" target=\\\"_blank\\\">array<\\/a>, <a href=\\\"https:\\/\\/docs.python.org\\/3\\/library\\/bisect.html\\\" target=\\\"_blank\\\">bisect<\\/a>, <a href=\\\"https:\\/\\/docs.python.org\\/3\\/library\\/collections.html\\\" target=\\\"_blank\\\">collections<\\/a>\\u3002 \\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n<p>\\u5982\\u9700\\u4f7f\\u7528 Map\\/TreeMap \\u6570\\u636e\\u7ed3\\u6784\\uff0c\\u60a8\\u53ef\\u4f7f\\u7528 <a href=\\\"http:\\/\\/www.grantjenks.com\\/docs\\/sortedcontainers\\/\\\" target=\\\"_blank\\\">sortedcontainers<\\/a> \\u5e93\\u3002<\\/p>\"]}",
            "book": null,
            "isSubscribed": false,
            "isDailyQuestion": false,
            "dailyRecordStatus": null,
            "editorType": "CKEDITOR",
            "ugcQuestionId": null,
            "style": "LEETCODE",
            "exampleTestcases": "1\n2",
            "__typename": "QuestionNode"
        }
    }
}