java-B-3找字母

找字母

方法一

import java.util.Scanner;
//1:无需package
//2: 类名必须Main, 不可修改
// 12 13 14
public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		// 在此输入您的代码...
		int index = 0;
		char[] a = new char[2014];
		for (int i = 0; i < 106; i++) {
			for (int j = 0; j < 19; j++) {
				a[index++] = (char)('a'+j);
			}
		}
//		for (int i = 0; i < a.length; i++) {
//			System.out.print(a[i]);
//		}
		int len = a.length;
		while (len > 1) {
			int k = 0;
			// 要从第一个字母开始删除所以这里 i 初始化为1
			for (int i = 1; i < len; i+=2) {
				a[k++] = a[i];	
			}
			len = k;
		}
		System.out.println(a[0]);
		scan.close();
	}
}

方法二

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
//1:无需package
//2: 类名必须Main, 不可修改
// 12 13 14
public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		// 在此输入您的代码...
		List<Character> list1 = new ArrayList<>();
		List<Character> list2 = new ArrayList<>();
		String tmp = "abcdefghijklmnopqrs";
		StringBuilder sb = new StringBuilder();
		int n = 106;
		while (n > 0) {
			n--;
			sb.append(tmp);
		}
		String str = sb.toString();
		for (int i = 0; i < str.length(); i++) {
			list1.add(str.charAt(i));
		}
		while (list1.size()>1) {
			for (int i = 0; i < list1.size(); i++) {
				if(i%2==1)list2.add(list1.get(i));
			}
			list1 = new ArrayList<>();
			list1.addAll(list2);
			list2 = new ArrayList<>();
		}
		System.out.println(list1.get(0));
		scan.close();
	}
}