3526921_wa.java

北大大牛代码 1240道题的原代码 超级权威

import java.util.*;

public class Main {
	private Scanner in;
	private static HashMap <Character, Character> hm = new HashMap <Character, Character> ();

	static {
		for (char ch = 'A'; ch <= 'Z'; ch++) {
			hm.put(ch, ch);
		}
		for (char ch = '1'; ch <= '9'; ch++) {
			hm.put(ch, ch);
		}
		hm.put('E', '3');
		hm.put('J', 'L');
		hm.put('L', 'J');
		hm.put('S', '2');
		hm.put('Z', '5');
		hm.put('2', 'S');
		hm.put('5', 'Z');
	}

	public static void main(String [] args) {
		new Main().run();
	}

	private String reverse(String str) {
		String ret = "";

		for (int i = str.length() - 1; i >= 0; i--) {
			ret += str.charAt(i);
		}
		return ret;
	}

	private boolean isPalindromeString(String str) {
		return str.equals(reverse(str));
	}

	private boolean isMirroredString(String str) {
		int length = str.length();

		for (int i = 0; i < length / 2; i++) {
			if (str.charAt(i) != hm.get(str.charAt(length - i - 1))) {
				return false;
			}
		}
		return true;
	}

	private void run() {
		in = new Scanner (System.in);
		String str;
		
		while (in.hasNext()) {
			str = in.next();
			System.out.print(str + " -- ");
			boolean ispalindrome = isPalindromeString(str);
			boolean ismirrored = isMirroredString(str);
			if (!ispalindrome) {
				if (!ismirrored) {
					System.out.println("is not a palindrome.");
				} else {
					System.out.println("is a mirrored string.");
				}
			} else {
				if (!ismirrored) {
					System.out.println("is a regular palindrome.");
				} else {
					System.out.println("is a mirrored palindrome.");
				}
			}
			System.out.println();
		}
	}
}