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1 最长不含重复字符的子字符串
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发布时间:2019-03-07

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最长不含重复字符的子字符串

剑指 Offer 48. 最长不含重复字符的子字符串请从字符串中找出一个最长的不包含重复字符的子字符串,计算该最长子字符串的长度。示例 1:输入: "abcabcbb"输出: 3 解释: 因为无重复字符的最长子串是 "abc",所以其长度为 3。示例 2:输入: "bbbbb"输出: 1解释: 因为无重复字符的最长子串是 "b",所以其长度为 1。示例 3:输入: "pwwkew"输出: 3解释: 因为无重复字符的最长子串是 "wke",所以其长度为 3。     请注意,你的答案必须是 子串 的长度,"pwke" 是一个子序列,不是子串。提示:s.length <= 40000
思路:	滑动窗口
public class Solution {       public int lengthOfLongestSubstring(String s) {           Set
set = new HashSet<>(); int left = 0, right = 0, max = 0; while (right < s.length()) { while (set.contains(s.charAt(right))) { set.remove(s.charAt(left)); left++; } set.add(s.charAt(right)); right++; max = Math.max(right - left, max); } return max; }}

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