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            "questionId": "3450",
            "questionFrontendId": "3178",
            "categoryTitle": "Algorithms",
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            "title": "Find the Child Who Has the Ball After K Seconds",
            "titleSlug": "find-the-child-who-has-the-ball-after-k-seconds",
            "content": "<p>You are given two <strong>positive</strong> integers <code>n</code> and <code>k</code>. There are <code>n</code> children numbered from <code>0</code> to <code>n - 1</code> standing in a queue <em>in order</em> from left to right.</p>\n\n<p>Initially, child 0 holds a ball and the direction of passing the ball is towards the right direction. After each second, the child holding the ball passes it to the child next to them. Once the ball reaches <strong>either</strong> end of the line, i.e. child 0 or child <code>n - 1</code>, the direction of passing is <strong>reversed</strong>.</p>\n\n<p>Return the number of the child who receives the ball after <code>k</code> seconds.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 3, k = 5</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">1</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<table>\n\t<tbody>\n\t\t<tr>\n\t\t\t<th>Time elapsed</th>\n\t\t\t<th>Children</th>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>0</code></td>\n\t\t\t<td><code>[<u>0</u>, 1, 2]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>1</code></td>\n\t\t\t<td><code>[0, <u>1</u>, 2]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>2</code></td>\n\t\t\t<td><code>[0, 1, <u>2</u>]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>3</code></td>\n\t\t\t<td><code>[0, <u>1</u>, 2]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>4</code></td>\n\t\t\t<td><code>[<u>0</u>, 1, 2]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>5</code></td>\n\t\t\t<td><code>[0, <u>1</u>, 2]</code></td>\n\t\t</tr>\n\t</tbody>\n</table>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 5, k = 6</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<table>\n\t<tbody>\n\t\t<tr>\n\t\t\t<th>Time elapsed</th>\n\t\t\t<th>Children</th>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>0</code></td>\n\t\t\t<td><code>[<u>0</u>, 1, 2, 3, 4]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>1</code></td>\n\t\t\t<td><code>[0, <u>1</u>, 2, 3, 4]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>2</code></td>\n\t\t\t<td><code>[0, 1, <u>2</u>, 3, 4]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>3</code></td>\n\t\t\t<td><code>[0, 1, 2, <u>3</u>, 4]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>4</code></td>\n\t\t\t<td><code>[0, 1, 2, 3, <u>4</u>]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>5</code></td>\n\t\t\t<td><code>[0, 1, 2, <u>3</u>, 4]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>6</code></td>\n\t\t\t<td><code>[0, 1, <u>2</u>, 3, 4]</code></td>\n\t\t</tr>\n\t</tbody>\n</table>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 4, k = 2</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<table>\n\t<tbody>\n\t\t<tr>\n\t\t\t<th>Time elapsed</th>\n\t\t\t<th>Children</th>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>0</code></td>\n\t\t\t<td><code>[<u>0</u>, 1, 2, 3]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>1</code></td>\n\t\t\t<td><code>[0, <u>1</u>, 2, 3]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>2</code></td>\n\t\t\t<td><code>[0, 1, <u>2</u>, 3]</code></td>\n\t\t</tr>\n\t</tbody>\n</table>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= n &lt;= 50</code></li>\n\t<li><code>1 &lt;= k &lt;= 50</code></li>\n</ul>\n",
            "translatedTitle": "找出 K 秒后拿着球的孩子",
            "translatedContent": "<p>给你两个 <strong>正整数 </strong><code>n</code> 和 <code>k</code>。有 <code>n</code> 个编号从 <code>0</code> 到 <code>n - 1</code> 的孩子按顺序从左到右站成一队。</p>\n\n<p>最初，编号为 0 的孩子拿着一个球，并且向右传球。每过一秒，拿着球的孩子就会将球传给他旁边的孩子。一旦球到达队列的 <strong>任一端 </strong>，即编号为 0 的孩子或编号为 <code>n - 1</code> 的孩子处，传球方向就会<strong> 反转 </strong>。</p>\n\n<p>返回 <code>k</code> 秒后接到球的孩子的编号。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong><span class=\"example-io\">n = 3, k = 5</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">1</span></p>\n\n<p><strong>解释：</strong></p>\n\n<table>\n\t<tbody>\n\t\t<tr>\n\t\t\t<th>经过的时间</th>\n\t\t\t<th>孩子队列</th>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>0</code></td>\n\t\t\t<td><code>[<u>0</u>, 1, 2]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>1</code></td>\n\t\t\t<td><code>[0, <u>1</u>, 2]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>2</code></td>\n\t\t\t<td><code>[0, 1, <u>2</u>]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>3</code></td>\n\t\t\t<td><code>[0, <u>1</u>, 2]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>4</code></td>\n\t\t\t<td><code>[<u>0</u>, 1, 2]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>5</code></td>\n\t\t\t<td><code>[0, <u>1</u>, 2]</code></td>\n\t\t</tr>\n\t</tbody>\n</table>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong><span class=\"example-io\">n = 5, k = 6</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">2</span></p>\n\n<p><strong>解释：</strong></p>\n\n<table>\n\t<tbody>\n\t\t<tr>\n\t\t\t<th>经过的时间</th>\n\t\t\t<th>孩子队列</th>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>0</code></td>\n\t\t\t<td><code>[<u>0</u>, 1, 2, 3, 4]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>1</code></td>\n\t\t\t<td><code>[0, <u>1</u>, 2, 3, 4]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>2</code></td>\n\t\t\t<td><code>[0, 1, <u>2</u>, 3, 4]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>3</code></td>\n\t\t\t<td><code>[0, 1, 2, <u>3</u>, 4]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>4</code></td>\n\t\t\t<td><code>[0, 1, 2, 3, <u>4</u>]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>5</code></td>\n\t\t\t<td><code>[0, 1, 2, <u>3</u>, 4]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>6</code></td>\n\t\t\t<td><code>[0, 1, <u>2</u>, 3, 4]</code></td>\n\t\t</tr>\n\t</tbody>\n</table>\n</div>\n\n<p><strong class=\"example\">示例 3：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong><span class=\"example-io\">n = 4, k = 2</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">2</span></p>\n\n<p><strong>解释：</strong></p>\n\n<table>\n\t<tbody>\n\t\t<tr>\n\t\t\t<th>经过的时间</th>\n\t\t\t<th>孩子队列</th>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>0</code></td>\n\t\t\t<td><code>[<u>0</u>, 1, 2, 3]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>1</code></td>\n\t\t\t<td><code>[0, <u>1</u>, 2, 3]</code></td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td><code>2</code></td>\n\t\t\t<td><code>[0, 1, <u>2</u>, 3]</code></td>\n\t\t</tr>\n\t</tbody>\n</table>\n</div>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= n &lt;= 50</code></li>\n\t<li><code>1 &lt;= k &lt;= 50</code></li>\n</ul>\n",
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<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 = 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