Web Reference: Jan 20, 2026 · To find the length of the longest substring with distinct characters starting from an index, we create a new visited array of size = 26 to keep track of included characters in the substring. vis [0] checks for 'a', vis [1] checks for 'b', vis [2] checks for 'c' and so on. Longest Substring Without Repeating Characters - Given a string s, find the length of the longest substring without duplicate characters. Example 1: Input: s = "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3. Note that "bca" and "cab" are also correct answers. Learn how to find the length of the longest substring without repeating characters using the sliding window technique. This efficient solution uses a hash map and two pointers to optimize for time and space.
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