mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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182 lines
17 KiB
JSON
182 lines
17 KiB
JSON
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"title": "Minimum Number of Food Buckets to Feed the Hamsters",
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"content": "<p>You are given a <strong>0-indexed</strong> string <code>hamsters</code> where <code>hamsters[i]</code> is either:</p>\n\n<ul>\n\t<li><code>'H'</code> indicating that there is a hamster at index <code>i</code>, or</li>\n\t<li><code>'.'</code> indicating that index <code>i</code> is empty.</li>\n</ul>\n\n<p>You will add some number of food buckets at the empty indices in order to feed the hamsters. A hamster can be fed if there is at least one food bucket to its left or to its right. More formally, a hamster at index <code>i</code> can be fed if you place a food bucket at index <code>i - 1</code> <strong>and/or</strong> at index <code>i + 1</code>.</p>\n\n<p>Return <em>the minimum number of food buckets you should <strong>place at empty indices</strong> to feed all the hamsters or </em><code>-1</code><em> if it is impossible to feed all of them</em>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/11/01/example1.png\" style=\"width: 482px; height: 162px;\" />\n<pre>\n<strong>Input:</strong> hamsters = "H..H"\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> We place two food buckets at indices 1 and 2.\nIt can be shown that if we place only one food bucket, one of the hamsters will not be fed.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/11/01/example2.png\" style=\"width: 602px; height: 162px;\" />\n<pre>\n<strong>Input:</strong> hamsters = ".H.H."\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> We place one food bucket at index 2.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/11/01/example3.png\" style=\"width: 602px; height: 162px;\" />\n<pre>\n<strong>Input:</strong> hamsters = ".HHH."\n<strong>Output:</strong> -1\n<strong>Explanation:</strong> If we place a food bucket at every empty index as shown, the hamster at index 2 will not be able to eat.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= hamsters.length <= 10<sup>5</sup></code></li>\n\t<li><code>hamsters[i]</code> is either<code>'H'</code> or <code>'.'</code>.</li>\n</ul>\n",
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"code": "-spec minimum_buckets(Hamsters :: unicode:unicode_binary()) -> integer().\nminimum_buckets(Hamsters) ->\n .",
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"When is it impossible to collect the rainwater from all the houses?",
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"When one or more houses do not have an empty space adjacent to it.",
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"Assuming the rainwater from all previous houses is collected. If there is a house at index i and you are able to place a bucket at index i - 1 or i + 1, where should you put it?",
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"It is always better to place a bucket at index i + 1 because it can collect the rainwater from the next house as well."
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],
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"sampleTestCase": "\"H..H\"",
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