Python | Leetcode Python题解之第387题字符串中的第一个唯一字符

题目：

题解：

class Solution:def firstUniqChar(self, s: str) -> int:position = dict()q = collections.deque()n = len(s)for i, ch in enumerate(s):if ch not in position:position[ch] = iq.append((s[i], i))else:position[ch] = -1while q and position[q[0][0]] == -1:q.popleft()return -1 if not q else q[0][1]