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  1. import java.util.Arrays;
  2.  
  3. class FirstUniqueCharFinder {
  4.   static char find(final String word) {
  5.     char[] charArray = word.toLowerCase().toCharArray();
  6.  
  7.     int[] ascii = new int[26];
  8.     Arrays.fill(ascii, 0);
  9.  
  10.     for (char c : charArray) {
  11.       int n = ((int) c) - 97;
  12.       ascii[n]++;
  13.     }
  14.  
  15.     for (char c: charArray) {
  16.       int n = ((int) c) - 97;
  17.       if (ascii[n] == 1) {
  18.         return c;
  19.       }
  20.     }
  21.  
  22.     return ' ';
  23.   }
  24.  
  25.   public static void main(String[] args) {
  26.     System.out.println(find("transaction"));
  27.     System.out.println(find("reverse"));
  28.   }
  29. }
Success #stdin #stdout 0.05s 4386816KB
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https://ideone.com/mFBYdK
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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