Python程序:查找最长递减单词链的长度?
假设我们有一个有效的单词列表,还有一个字符串 s,我们需要找到从 s 开始,通过移除单个字母并仍然构成有效单词,可以生成的**最长递减单词链**的长度。
例如,如果输入为 words = ["lii", "limit", "limi", "li", "coffee", "jug", "pool", "type"] s = "limit",则输出将为 4,因为我们可以从单词 "limit" 开始构建链: "limit" -> "limi" -> "lii" -> "li"。
为了解决这个问题,我们将遵循以下步骤
定义一个函数 solve()。它将接收 words 和 s 作为输入。
max_num := 0
对于 words 中的每个 i,执行以下操作:
如果 i 与 s 相同,则执行以下操作:
对于从 0 到 s 大小的范围内的每个 j,执行以下操作:
max_num := 1 + solve(words, s[从索引 0 到 j-1] 连接 s[从索引 j + 1 到结尾]) 和 max_num 中的最大值
返回 max_num
示例
class Solution: def solve(self, words, s): max_num = 0 for i in words: if i == s: for j in range(len(s)): max_num = max(1 + self.solve(words, s[:j] + s[j + 1 :]), max_num) return max_num ob = Solution() words = ["lii", "limit", "limi", "li", "coffee", "jug", "pool", "type"] s = "limit" print(ob.solve(words, s))
输入
["lii", "limit", "limi", "li", "coffee", "jug", "pool", "type"],"limit"
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输出
4
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