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[Java教程]3. Longest Substring Without Repeating Characters


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.

代码如下:

 1 public class Solution { 2   public int lengthOfLongestSubstring(String s) { 3     int max=0; 4     char[] ss=s.toCharArray(); 5      6     for(int i=0;i<ss.length;i++) 7     { 8       int count=0; 9       Map<Character,Character> map=new HashMap<>();10       for(int j=i;j<ss.length;j++)11       {12         if(!map.containsKey(ss[j]))13         {14         map.put(ss[j],ss[j]);15         count++;16         } 17         else break;18       }19       if(count>max)20       max=count;21     }22     return max;23   }24 }