(DP)3.Longest Substring Without Repeating Characters
Posted on 2016-04-11 02:43 cKK 阅读(134) 评论(0) 编辑 收藏 举报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 Solution { public int lengthOfLongestSubstring(String s) { if (s.length() == 0) return 0; String[] dp = new String[s.length()]; dp[0] = s.substring(0, 1); int index = 0; for (int i = 1; i < s.length(); i++) { if (s.charAt(i) == s.charAt(i - 1)) dp[i] = s.substring(i - 1, i); else { index = dp[i - 1].indexOf(s.charAt(i)); if (index == -1) dp[i] = dp[i - 1] + s.charAt(i); else dp[i] = dp[i - 1].substring(index+1) +s.charAt(i); } } index = 0; for (int i = 0; i < s.length(); i++) { if (dp[i].length() > index) index = dp[i].length(); } return index; } }