Google Code Jam Notes - Reverse Words - Java

Problem:

Retrieved from: http://code.google.com/codejam/contest/351101/dashboard#s=p1

Given a list of space separated words, reverse the order of the words. Each line of text contains L letters and W words. A line will only consist of letters and space characters. There will be exactly one space character between each pair of consecutive words.

Input

The first line of input gives the number of cases, N.
N test cases follow. For each test case there will a line of letters and space characters indicating a list of space separated words. Spaces will not appear at the start or end of a line.

Output

For each test case, output one line containing "Case #x: " followed by the list of words in reverse order.

Limits

Small dataset

N = 5
1 ≤ L ≤ 25

Large dataset

N = 100
1 ≤ L ≤ 1000

Sample

Input	Output
3 this is a test foobar all your base	Case #1: test a is this Case #2: foobar Case #3: base your all

Analysis:

Straightforward, use String.split("\\s") to separate each word.

Time complexity: O(n).

My solution: (Your opinion is highly appreciated)

[java] view plaincopy






package codeJam.google.com;  
  
import java.io.BufferedReader;  
import java.io.FileReader;  
import java.io.FileWriter;  
import java.io.IOException;  
  
/** 
 * @author Zhenyi 2013 Dec 22, 2013 12:04:12 PM 
 */  
public class ReverseWords {  
    public static void main(String[] args) throws IOException {  
        BufferedReader in = new BufferedReader(new FileReader(  
                "C:/Users/Zhenyi/Downloads/B-small-practice.in"));  
        FileWriter out = new FileWriter(  
                "C:/Users/Zhenyi/Downloads/B-small-practice.out");  
        // BufferedReader in = new BufferedReader(new  
        // FileReader("C:/Users/Zhenyi/Downloads/B-large-practice.in"));  
        // FileWriter out = new  
        // FileWriter("C:/Users/Zhenyi/Downloads/B-large-practice.out");  
  
        int N = new Integer(in.readLine());  
  
        for (int cases = 1; cases <= N; cases++) {  
            String[] st = new String(in.readLine()).split("\\s");  
  
            out.write("Case #" + cases + ": ");  
            for (int i = st.length - 1; i >= 0; i--) {  
                out.write(st[i] + " ");  
            }  
            out.write(" ");  
  
        }  
        in.close();  
        out.flush();  
        out.close();  
    }  
}