mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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188 lines
18 KiB
JSON
188 lines
18 KiB
JSON
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"questionId": "1627",
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"title": "Last Moment Before All Ants Fall Out of a Plank",
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"content": "<p>We have a wooden plank of the length <code>n</code> <strong>units</strong>. Some ants are walking on the plank, each ant moves with a speed of <strong>1 unit per second</strong>. Some of the ants move to the <strong>left</strong>, the other move to the <strong>right</strong>.</p>\n\n<p>When two ants moving in two <strong>different</strong> directions meet at some point, they change their directions and continue moving again. Assume changing directions does not take any additional time.</p>\n\n<p>When an ant reaches <strong>one end</strong> of the plank at a time <code>t</code>, it falls out of the plank immediately.</p>\n\n<p>Given an integer <code>n</code> and two integer arrays <code>left</code> and <code>right</code>, the positions of the ants moving to the left and the right, return <em>the moment when the last ant(s) fall out of the plank</em>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/06/17/ants.jpg\" style=\"width: 450px; height: 610px;\" />\n<pre>\n<strong>Input:</strong> n = 4, left = [4,3], right = [0,1]\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> In the image above:\n-The ant at index 0 is named A and going to the right.\n-The ant at index 1 is named B and going to the right.\n-The ant at index 3 is named C and going to the left.\n-The ant at index 4 is named D and going to the left.\nThe last moment when an ant was on the plank is t = 4 seconds. After that, it falls immediately out of the plank. (i.e., We can say that at t = 4.0000000001, there are no ants on the plank).\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/06/17/ants2.jpg\" style=\"width: 639px; height: 101px;\" />\n<pre>\n<strong>Input:</strong> n = 7, left = [], right = [0,1,2,3,4,5,6,7]\n<strong>Output:</strong> 7\n<strong>Explanation:</strong> All ants are going to the right, the ant at index 0 needs 7 seconds to fall.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/06/17/ants3.jpg\" style=\"width: 639px; height: 100px;\" />\n<pre>\n<strong>Input:</strong> n = 7, left = [0,1,2,3,4,5,6,7], right = []\n<strong>Output:</strong> 7\n<strong>Explanation:</strong> All ants are going to the left, the ant at index 7 needs 7 seconds to fall.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 10<sup>4</sup></code></li>\n\t<li><code>0 <= left.length <= n + 1</code></li>\n\t<li><code>0 <= left[i] <= n</code></li>\n\t<li><code>0 <= right.length <= n + 1</code></li>\n\t<li><code>0 <= right[i] <= n</code></li>\n\t<li><code>1 <= left.length + right.length <= n + 1</code></li>\n\t<li>All values of <code>left</code> and <code>right</code> are unique, and each value can appear <strong>only in one</strong> of the two arrays.</li>\n</ul>\n",
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"The ants change their way when they meet is equivalent to continue moving without changing their direction.",
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"Answer is the max distance for one ant to reach the end of the plank in the facing direction."
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