This problem can be solved using the sliding window technique. Here are the steps in Python:

1. Initialize two pointers, `start` and `end`, to point to the beginning of the string. These pointers will define our current substring.

2. Initialize a dictionary, `used_chars`, to keep track of the characters we have seen and their latest positions.

3. While `end` is less than the length of the string, do the following:

- If the character at `end` is not in `used_chars`, add it to `used_chars` and increment `end`.

- If the character at `end` is in `used_chars`, move `start` to the right of the previous instance of the character at `end` and update its position in `used_chars`.

4. The length of the longest substring without repeating characters is the maximum length of the substring we have seen during this process.

Here is the Python code for the above steps:

```python
def lengthOfLongestSubstring(s):
start = max_length = 0
used_chars = {}

for i, char in enumerate(s):
if char in used_chars and start

Question

This problem can be solved using the sliding window technique. Here are the steps in Python:

1. Initialize two pointers, `start` and `end`, to point to the beginning of the string. These pointers will define our current substring.

2. Initialize a dictionary, `used_chars`, to keep track of the characters we have seen and their latest positions.

3. While `end` is less than the length of the string, do the following:

- If the character at `end` is not in `used_chars`, add it to `used_chars` and increment `end`.

- If the character at `end` is in `used_chars`, move `start` to the right of the previous instance of the character at `end` and update its position in `used_chars`.

4. The length of the longest substring without repeating characters is the maximum length of the substring we have seen during this process.

Here is the Python code for the above steps:

```python
def lengthOfLongestSubstring(s):
    start = max_length = 0
    used_chars = {}

for i, char in enumerate(s):
        if char in used_chars and start <= used_chars[char]:
            start = used_chars[char] + 1
        else:
            max_length = max(max_length, i - start + 1)

used_chars[char] = i

return max_length
```

This function works by keeping track of the longest substring seen so far and the start of the current substring. When it sees a repeating character, it moves the start of the current substring to the right of the previous instance of the repeating character and updates the position of the repeating character. The length of the longest substring is updated whenever a longer substring is found.

Knowee AI · Accepted Answer