Zhoucheng Li chouclee
chouclee
/ UniqueString.java
Created
June 16, 2014 03:48
[CC150][1.1] Implement an algorithm to determine if a string has all unique characters. What if you cannot use additional data structures? (not applicable for Unicode)
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| import java.util.Scanner; | |
| public class UniqueString { | |
| public static boolean unique(String s) { | |
| if (s == null) return false; | |
| boolean[] flag = new boolean[256]; | |
| for (int i = 0; i < s.length(); i++) { | |
| if (flag[s.charAt(i)]) | |
| return false; | |
| else |
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