Problem14

package com.shui.mu.yao.io.algorithm;

public class Problem14 {

	public static void main(String[] args) {
		long starttime = System.currentTimeMillis();
		int start = 640000;/**10：123456789往上翻20再翻40..->640000--1280000*/
		int end = 1000000;
		int[] seed = new int[end];
		int max = 0;
		int digit = 0;
		/**预热10W数据到arr里面 存储seed值*/
		for (int i = 2; i < 10000; i++) {
			find(end, seed, i);
		}
		for (int i = start; i < end; i++) {
			int number=find(end, seed, i);
			if (number > max) {
				max = number;
				digit = i;
			}
		}
		System.out.println("digit: "+digit+"\t"+"maxCount:"+max);
		System.out.println(System.currentTimeMillis() - starttime);
		

	}

	private static int find(int end, int[] seed, int i) {
		long count = i;
		int number = 0;
		if(seed[i]>0)
			return seed[i];
		while (count != 1) {
			if(count<end&&seed[(int) count]>0)
			{
				number+=seed[(int) count];
				break;
			}
			if ((count & 0X0001) == 0) {
				count = count >> 1;
			} else {
				count = (count << 1) + 1 + count;
			}
			number++;
		}
		seed[i]=number;
		return number;
	}
	

}