LongestSubstring.java ( File view )

• By issaczr 2014-10-24
• View(s)：52
• Point(s)： 1
```			// Author:   Li Long, 1988lilong@163.com
// Date:     Apr 17, 2014
// Source:   http://oj.leetcode.com/problems/longest-substring-without-repeating-characters/
// Analysis: http://blog.csdn.net/lilong_dream/article/details/19431417

// Given a string, find the length of the longest substring without repeating characters.
// For example, the longest substring without repeating letters for "abcabcbb" is "abc", which the length is 3.
// For "bbbbb" the longest substring is "b", with the length of 1.

public class LongestSubstring {

public int lengthOfLongestSubstring(String s) {

int length = s.length();
if (length == 1) {

return 1;

}

int longest = 0;
int len = 0;
String tmp;

for (int i = 0; i < length; ++i) {

if (longest >= length - i) {
// (1)
break; 					  // no need to go on

}

len = 0;
for (int j = i + 1; j < length; ++j) {

++len;

tmp = s.substring(i, j);
int index = tmp.indexOf(s.charAt(j));
if (index != -1) {

i += index;
// compare following items
int k = j;  // in order to make it clear(works well without k)
while ((++k < length) && (s.charAt(i + 1) == s.charAt(k))) {

++i;

}

if (longest < len) {

longest = len;

}

break;

}

if (j == length - 1) {

longest = len + 1;  // this is true because of (1)
break;              // to make it clear, do like this:
// if (longest < len + 1) longest = len + 1;

}

}

}

return longest;

}

public static void main(String[] args) {

LongestSubstring slt = new LongestSubstring();
int len = slt.lengthOfLongestSubstring("wlrbbmqbhcdarzowkkyhiddqscdxrjmowfrxsjybl"
+ "dbefsarcbynecdyggxxpklorellnmpapqfwkhopkmco");
System.out.println(len);

}

}
```
...
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