Given a string, find the length of the longest substring without repeating characters.
Example 1:
Input: "abcabcbb"
Output: 3
Explanation: The answer is "abc"
, with the length of 3.
Example 2:
Input: "bbbbb"
Output: 1
Explanation: The answer is "b"
, with the length of 1.
Example 3:
Input: "pwwkew"
Output: 3
Explanation: The answer is "wke"
, with the length of 3.
Note that the answer must be a substring, "pwke"
is a subsequence and not a substring.
题解:
动态记录上一次不重复点