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 asubsequenceand not a substring

**Solution**

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