UVa Problem ID 299 (Train Swapping)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws IOException 
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb=new StringBuffer("");
        int testcases=Integer.parseInt(br.readLine());
        for (int i = 0; i 50)
        		System.exit(0);
        	int a[]=new int[L];
        	String s[]=br.readLine().split(" ");
        	for(int j=0;ja[j2])
					{
						int temp=a[j2];
						a[j2]=a[j];
						a[j]=temp;
						swapcount++;
					}
				}
			}
        	sb.append("Optimal train swapping takes "+swapcount+" swaps.\n");
        }
        System.out.print(sb);
    }
}