[OJ]: Reverse Words in a String

Reverse Words in a String

需求说明

Given an input string, reverse the string word by word.

For example,

Given s = "the sky is blue",

return "blue is sky the".

大致题意

输入一个字符串并翻转这个字符串.

举例,

给定一个字符串"the sky is blue"

返回字符串"blue is sky the"

实现方法

Python

#!/bin/env python
string = raw_input('Please input a string: ')
print " ".join(string.split()[::-1])

Perl

#!/bin/env perl
use strict;
use warnings;
print "Please input a string: ";
my $string = <STDIN>;
print join(' ',reverse(split(' ',$string)))."\n";

Java

import java.util.Scanner;
public class reverseString {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        System.out.print("Please input a string:");
        String[] string = console.nextLine().split(" ");
        StringBuilder result = new StringBuilder();
        for (int i = string.length - 1; i >= 0; --i) {
            result.append(string[i]).append(" ");
        }
        String reverse =  result.substring(0, result.length()-1);
        System.out.println(reverse);
    }
}

通过上述例子可以看出perl、python处理文本的强大之处.

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