3. Longest Substring Without Repeating Characters π
Date: Jun 03, 2024
Tags: sliding-window
Description
Given a string s
, find the length of the
longest substring
without repeating characters.
Example 1:
Input: s = "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3.
Example 2:
Input: s = "bbbbb" Output: 1 Explanation: The answer is "b", with the length of 1.
Example 3:
Input: s = "pwwkew" Output: 3 Explanation: The answer is "wke", with the length of 3. Notice that the answer must be a substring, "pwke" is a subsequence and not a substring.
Constraints:
-
0 <= s.length <= 5 * 104
-
s
consists of English letters, digits, symbols and spaces.
Optimal
function lengthOfLongestSubstring(s: string): number {
let l = 0;
let r = 0;
const result = new Set();
let len = 0;
while (r < s.length) {
if (!result.has(s[r])) {
result.add(s[r]);
len = Math.max(len, r - l + 1);
r++;
} else {
result.delete(result.values().next().value);
l++;
}
}
return len;
}
export { lengthOfLongestSubstring };