Python程序:查找唯一字符连接字符串的长度?
假设我们有一组字符串words。我们需要构造一个字符串,该字符串通过连接words的子序列构成,并且每个字母都是唯一的。最终我们需要找到最长此类连接的长度。
因此,如果输入类似于words = ["xyz", "xyw", "wab", "cde"],则输出将为9,因为我们无法选择任何单词,因为它们包含重复的字符。
为了解决这个问题,我们将遵循以下步骤
ans := 0
定义一个函数recur()。这将取i:= 0, cur:= 空字符串
if i is same as size of words , then ans := maximum of ans and size of cur return recur(i + 1, cur) if all characters in words[i] are unique and all characters in (cur + words[i]) are unique, then recur(i + 1, cur + words[i]) From the main method do the following: recur() return ans
让我们看看下面的实现以更好地理解
示例
class Solution: def solve(self, words): ans = 0 def is_all_unique(s): return len(set(s)) == len(s) def recur(i=0, cur=""): nonlocal ans if i == len(words): ans = max(ans, len(cur)) return recur(i + 1, cur) if is_all_unique(words[i]) and is_all_unique(cur + words[i]): recur(i + 1, cur + words[i]) recur() return ans ob = Solution() words = ["xyz", "xyw", "wab", "cde"] print(ob.solve(words))
输入
["xyz", "xyw", "wab", "cde"]
输出
9
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