12468 - Zapping - Java

 import java.io.BufferedReader;  
 import java.io.File;  
 import java.io.FileInputStream;  
 import java.io.IOException;  
 import java.io.InputStream;  
 import java.io.InputStreamReader;  
 import java.util.StringTokenizer;  
 public class Zapping {  
      public static void main(String[] args) throws Exception {  
           Reader.init(System.in);  
 //          Reader.init(new FileInputStream(new File("input.in")));  
           int a = Reader.nextInt();  
           int b = Reader.nextInt();  
           int val;  
           while(a >= 0 && b >= 0) {  
                val = Math.abs(a - b);  
                if(val > 50) val = 100 - val;  
                System.out.println(val);  
                a = Reader.nextInt();  
                b = Reader.nextInt();  
           }  
      }  
 }  
 ///** Class for buffered reading int and double values */  
 ///** http://www.cpe.ku.ac.th/~jim/java-io.html */  
 class Reader {  
      static BufferedReader reader;  
      static StringTokenizer tokenizer;  
      /** call this method to initialize reader for InputStream */  
      static void init(InputStream input) {  
           reader = new BufferedReader(new InputStreamReader(input));  
           tokenizer = new StringTokenizer("");  
      }  
      /** get next word */  
      static String next() throws IOException {  
           while ( ! tokenizer.hasMoreTokens() ) {  
                //TODO add check for eof if necessary  
                tokenizer = new StringTokenizer(reader.readLine());  
           }  
           return tokenizer.nextToken();  
      }  
      static int nextInt() throws IOException {  
           return Integer.parseInt( next() );  
      }  
      static double nextDouble() throws IOException {  
           return Double.parseDouble( next() );  
      }  
 }