您当前位置：首页 > php开源 > php教程 > LeetCode:Longest Substring Without Repeating Characters

LeetCode:Longest Substring Without Repeating Characters

来源：程序员人生发布时间：2016-06-13 11:00:46 阅读次数：2047次

Longest Substring Without Repeating Characters

Total Accepted: 152787 Total Submissions: 687012 Difficulty: Medium

Given a string, find the length of the longest substring without repeating characters.

Examples:

Given "abcabcbb", the answer is "abc", which the length is 3.

Given "bbbbb", the answer is "b", with the length of 1.

Given "pwwkew", the answer is "wke", with the length of 3. Note that the answer must be a substring, "pwke" is a subsequence and not a substring.

Subscribe to see which companies asked this question

Hide Tags

Hash Table Two Pointers String

Hide Similar Problems

(H) Longest Substring with At Most Two Distinct Characters

思路：

保护1个HashMap存储每一个字符的位置；两个指针i,j，保护最长子串的范围。

java code:

public class Solution { public int lengthOfLongestSubstring(String s) { if(s==null || s.length()==0) return 0; Map<Character, Integer> map = new HashMap<Character, Integer>(); int max = 0; for(int i=0,j=0;i<s.length();i++) { char c = s.charAt(i); if(map.containsKey(c)) { j = Math.max(j, map.get(c)+1); } map.put(c, i); max = Math.max(max, i-j+1); } return max; } }

生活不易，码农辛苦
如果您觉得本网站对您的学习有所帮助,可以手机扫描二维码进行捐赠
程序员人生

------分隔线----------------------------

上一篇 mongodb3.0的索引管理学习整理

下一篇 Python机器视觉编程环境搭建方法

分享到:

------分隔线----------------------------

为码而活

积分：4237

15粉丝

7关注

栏目热点