http://poj.org/problem?id=1028 import java.util.Scanner; import java.util.Stack; public class Main { String command; Stack<String> back = new Stack<String>(); Stack<String> forward = new Stack<String>(); String current = "http://www.acm.org/"; String display; public Main() { Scanner scan = new Scanner(System.in); while (!(command = scan.next()).equals("QUIT")) { if (command.equals("BACK")) { doBack(); } else if (command.equals("FORWARD")) { doForward(); } else if (command.equals("VISIT")) { doVisit(scan); } System.out.println(display); } } public void doBack() { if (back.isEmpty()) { display = "Ignored"; } else { forward.push(current); current = back.pop(); display = current; } } public void doForward() { if (forward.isEmpty()) { display = "Ignored"; } else { back.push(current); current = forward.pop(); display = current; } } public void doVisit(Scanner scan) { if (current != null) { back.push(current); } current = scan.next(); display = current; forward.clear(); } public static void main(String[] args) { new Main(); } }
Meta
-
Recent Posts
Recent Comments
- MorrissMar on 隆宪叁年-五一
- MorrissMar on 隆宪叁年-五一
- bngvlttwnj on 隆宪叁年-五一
- bngvlttwnj on 隆宪叁年-五一
- MorrissMar on 隆宪叁年-五一
Archives
- May 2024
- April 2023
- February 2023
- January 2023
- December 2022
- November 2022
- September 2022
- June 2022
- July 2021
- January 2021
- February 2020
- September 2019
- March 2018
- February 2018
- August 2016
- July 2016
- June 2016
- May 2016
- April 2016
- March 2016
- February 2016
- January 2016
- December 2015
- November 2015
- October 2015
- September 2015
- August 2015
- July 2015
- June 2015
- May 2015
- April 2015
- March 2015
- February 2015
- January 2015
- December 2014
- November 2014
- October 2014
- September 2014
- August 2014
- July 2014
- June 2014
- May 2014
- April 2014
- March 2014
- February 2014
- January 2014
- December 2013
- November 2013
- October 2013
- September 2013
- August 2013
- July 2013
- June 2013
- May 2013
- April 2013
- March 2013
- February 2013
- January 2013
- December 2012
- November 2012
- October 2012
- September 2012
- August 2012
- July 2012
- June 2012
- May 2012
- April 2012
- March 2012
- February 2012
- January 2012
- December 2011
- November 2011
- October 2011
- September 2011
- August 2011
- July 2011
- June 2011
- May 2011
- April 2011
- March 2011
- February 2011
- January 2011
- December 2010
- November 2010
- October 2010
- September 2010
- August 2010
- July 2010
- June 2010
- May 2010
- April 2010
- March 2010
- February 2010
- January 2010
- December 2009
- November 2009
- October 2009
- September 2009
- August 2009
- July 2009
- June 2009
- May 2009
- April 2009
- March 2009
- February 2009
Categories