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"translatedContent": "<p>给你一个长度为 <code>n</code> 的 <strong>3 跑道道路</strong> ,它总共包含 <code>n + 1</code> 个 <strong>点</strong> ,编号为 <code>0</code> 到 <code>n</code> 。一只青蛙从 <code>0</code> 号点第二条跑道 <strong>出发</strong> ,它想要跳到点 <code>n</code> 处。然而道路上可能有一些障碍。</p>\n\n<p>给你一个长度为 <code>n + 1</code> 的数组 <code>obstacles</code> ,其中 <code>obstacles[i]</code> <b>取值范围从 0 到 3</b>)表示在点 <code>i</code> 处的 <code>obstacles[i]</code> 跑道上有一个障碍。如果 <code>obstacles[i] == 0</code> ,那么点 <code>i</code> 处没有障碍。任何一个点的三条跑道中 <strong>最多有一个</strong> 障碍。</p>\n\n<ul>\n\t<li>比方说,如果 <code>obstacles[2] == 1</code> ,那么说明在点 2 处跑道 1 有障碍。</li>\n</ul>\n\n<p>这只青蛙从点 <code>i</code> 跳到点 <code>i + 1</code> 且跑道不变的前提是点 <code>i + 1</code> 的同一跑道上没有障碍。为了躲避障碍,这只青蛙也可以在 <strong>同一个</strong> 点处 <strong>侧跳</strong> 到 <strong>另外一条</strong> 跑道(这两条跑道可以不相邻),但前提是跳过去的跑道该点处没有障碍。</p>\n\n<ul>\n\t<li>比方说,这只青蛙可以从点 3 处的跑道 3 跳到点 3 处的跑道 1 。</li>\n</ul>\n\n<p>这只青蛙从点 0 处跑道 <code>2</code> 出发,并想到达点 <code>n</code> 处的 <strong>任一跑道</strong> ,请你返回 <strong>最少侧跳次数</strong> 。</p>\n\n<p><strong>注意</strong>:点 <code>0</code> 处和点 <code>n</code> 处的任一跑道都不会有障碍。</p>\n\n<p> </p>\n\n<p><strong>示例 1</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/03/25/ic234-q3-ex1.png\" style=\"width: 500px; height: 244px;\" />\n<pre>\n<b>输入:</b>obstacles = [0,1,2,3,0]\n<b>输出:</b>2 \n<b>解释:</b>最优方案如上图箭头所示。总共有 2 次侧跳(红色箭头)。\n注意这只青蛙只有当侧跳时才可以跳过障碍如上图点 2 处所示)。\n</pre>\n\n<p><strong>示例 2</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/03/25/ic234-q3-ex2.png\" style=\"width: 500px; height: 196px;\" />\n<pre>\n<b>输入:</b>obstacles = [0,1,1,3,3,0]\n<b>输出:</b>0\n<b>解释:</b>跑道 2 没有任何障碍,所以不需要任何侧跳。\n</pre>\n\n<p><strong>示例 3</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/03/25/ic234-q3-ex3.png\" style=\"width: 500px; height: 196px;\" />\n<pre>\n<b>输入:</b>obstacles = [0,2,1,0,3,0]\n<b>输出:</b>2\n<b>解释:</b>最优方案如上图所示。总共有 2 次侧跳。\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>obstacles.length == n + 1</code></li>\n\t<li><code>1 <= n <= 5 * 10<sup>5</sup></code></li>\n\t<li><code>0 <= obstacles[i] <= 3</code></li>\n\t<li><code>obstacles[0] == obstacles[n] == 0</code></li>\n</ul>\n",
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"hints": [
"At a given point, there are only 3 possible states for where the frog can be.",
"Check all the ways to move from one point to the next and update the minimum side jumps for each lane."