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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		String s1 = "transaction";
  13.         System.out.println(getFirstUniqueChar(s1));
  14.  
  15.         String s2 = "reverse";
  16.         System.out.println(getFirstUniqueChar(s2));
  17. 	}
  18.  
  19. 	public static char getFirstUniqueChar(String s) {
  20.         int[] temp = new int[26];
  21.         int alphabetNum;
  22.         for (int i = 0; i < s.length(); i++) {
  23.             alphabetNum = getAlphabetNum(s.charAt(i));
  24.             if (temp[alphabetNum] == 0) {
  25.                 temp[alphabetNum] = i;
  26.             } else {
  27.                 temp[alphabetNum] = -1;
  28.             }
  29.         }
  30.  
  31.         for (int i = 0; i < s.length(); i++) {
  32.             alphabetNum = getAlphabetNum(s.charAt(i));
  33.             if (temp[alphabetNum] == i) {
  34.                 return s.charAt(i);
  35.             }
  36.         }
  37.         return ' ';
  38.     }
  39.  
  40.     public static final int getAlphabetNum(char c) {
  41.         c = Character.toLowerCase(c);
  42.         return c - 'a';
  43.     }
  44. }
Success #stdin #stdout 0.04s 4386816KB
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https://ideone.com/FKlIlu
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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