diff --git a/problems/1047.删除字符串中的所有相邻重复项.md b/problems/1047.删除字符串中的所有相邻重复项.md index c4ae85c9..7b059d40 100644 --- a/problems/1047.删除字符串中的所有相邻重复项.md +++ b/problems/1047.删除字符串中的所有相邻重复项.md @@ -197,15 +197,38 @@ class Solution { Python: ```python3 +# 方法一,使用栈,推荐! class Solution: def removeDuplicates(self, s: str) -> str: - t = list() - for i in s: - if t and t[-1] == i: - t.pop(-1) + res = list() + for item in s: + if res and res[-1] == item: + t.pop() else: - t.append(i) - return "".join(t) # 字符串拼接 + t.append(item) + return "".join(res) # 字符串拼接 +``` + +```python3 +# 双指针 +class Solution: + def removeDuplicates(self, s: str) -> str: + res = list(s) + slow = fast = 0 + length = len(res) + + while fast < length: + # 如果一样直接换,不一样会把后面的填在slow的位置 + res[slow] = res[fast] + + # 如果发现和前一个一样,就退一格指针 + if slow > 0 and res[slow] == res[slow - 1]: + slow -= 1 + else: + slow += 1 + fast += 1 + + return ''.join(res[0: slow]) ``` Go: