![\"\"](\"https://pic.leetcode.cn/1710141378-bfEGUX-image.png\")
You are given a 0-indexed string hamsters where hamsters[i] is either:
'H' indicating that there is a hamster at index i, or'.' indicating that index i is empty.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 i can be fed if you place a food bucket at index i - 1 and/or at index i + 1.
Return the minimum number of food buckets you should place at empty indices to feed all the hamsters or -1 if it is impossible to feed all of them.
\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2022/11/01/example1.png\")
\n\nInput: hamsters = "H..H"\nOutput: 2\nExplanation: 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\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2022/11/01/example2.png\")
\n\nInput: hamsters = ".H.H."\nOutput: 1\nExplanation: We place one food bucket at index 2.\n\n\n
Example 3:
\n![\"\"](\"https://assets.leetcode.com/uploads/2022/11/01/example3.png\")
\n\nInput: hamsters = ".HHH."\nOutput: -1\nExplanation: If we place a food bucket at every empty index as shown, the hamster at index 2 will not be able to eat.\n\n\n
\n
Constraints:
\n\n1 <= hamsters.length <= 105hamsters[i] is either'H' or '.'.给你一个下标从 0 开始的字符串 hamsters ，其中 hamsters[i] 要么是：
'H' 表示有一个仓鼠在下标 i ，或者'.' 表示下标 i 是空的。你将要在空的位置上添加一定数量的食物桶来喂养仓鼠。如果仓鼠的左边或右边至少有一个食物桶，就可以喂食它。更正式地说，如果你在位置 i - 1 或者 i + 1 放置一个食物桶，就可以喂养位置为 i 处的仓鼠。
在 空的位置 放置食物桶以喂养所有仓鼠的前提下，请你返回需要的 最少 食物桶数。如果无解请返回 -1 。
\n\n
示例 1：
\n\n
\n输入：hamsters = \"H..H\"\n输出：2\n解释：\n我们可以在下标为 1 和 2 处放食物桶。\n可以发现如果我们只放置 1 个食物桶，其中一只仓鼠将得不到喂养。\n\n\n
示例 2：
\n\n![\"\"](\"https://pic.leetcode.cn/1710141384-oLAScv-image.png\")
\n输入：street = \".H.H.\"\n输出：1\n解释：\n我们可以在下标为 2 处放置一个食物桶。\n\n\n
示例 3：
\n\n\n输入：street = \".HHH.\"\n输出：-1\n解释：\n如果我们如图那样在每个空位放置食物桶，下标 2 处的仓鼠将吃不到食物。\n\n\n
\n\n
提示：
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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 \\u6ce8\\u610f Python 2.7 \\u5df2\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\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 \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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"editorType": "CKEDITOR",
"ugcQuestionId": null,
"style": "LEETCODE",
"exampleTestcases": "\"H..H\"\n\".H.H.\"\n\".HHH.\"",
"__typename": "QuestionNode"
}
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