【LeetCode OJ 075】Sort Colors

タイトルリンク:https://leetcode.com/problems/sort-colors/
タイトル:Given an array with n objects cored,white or blue,sort them so that objects of the same color are adjacent,with the cors in the order red,white and blue.
Here, we will use the integers 0, 1, and 2 to represent the color red, white, and blue respectively.
解題の構想は以下の通りである:配列を遍歴し、各色の個数を格納し、並べ替えを行い、サンプルコードは以下の通りである.

/**
 * @Description:
 * Given an array with n objects colored red, white or blue, 
 * sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue.
 * Here, we will use the integers 0, 1, and 2 to represent the color red, white, and blue respectively.
 * @author      
 * @date 2016 3 27    12:32:14 
 * @version V1.0
 */
public class Solution
{	
	 public static void sortColors(int[] nums)
	 {
	        if(nums==null||nums.length<=0)
	        	return;
	        int a[]=new int[3];
	        for(int i=0;i<nums.length;i++)
	        {
	        	a[nums[i]]++;
	        }
	        int x=0;
	        int y=0;
	        int z=0;
	        for(int i=0;i<nums.length;)
	        {
	        	while(x<a[0])
	        	{
	        		x++;
	        		nums[i]=0;
	        		i++;
	        		continue;
	        	}
	        	while(y<a[1])
	        	{
	        		y++;
	        		nums[i]=1;
	        		i++;
	        		continue;
	        	}
	        	while(z<a[2])
	        	{
	        		z++;
	        		nums[i]=2;
	        		i++;
	        		continue;
	        	}
	        }
	 }
}