[LeetCode]: 283: Move Zeroes

题目：

Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.

For example, given nums = [0, 1, 0, 3, 12], after calling your function, nums should be [1, 3, 12, 0, 0].

Note:

1. You must do this in-place without making a copy of the array.
2. Minimize the total number of operations.

分析：从后向前逐一查找即可

代码：

public class Solution {
    public static void moveZeroes(int[] nums) {
        for(int i =nums.length-1; i >=0 ;i--){
            if(nums[i] ==0){
                int intTemp = 0;
                for(int j=i+1;j<nums.length;j++){
                    if(nums[j]!= 0){
                        nums[j-1] = nums[j];
                        nums[j] = 0;
                    }
                }
            }
        }
    }
}

网上高手的思路：现将非0的数前移，再将余下的空位补0

代码：

public class Solution {
    public static void moveZeroes(int[] nums) {
        int iCounter = 0;
        for(int i =0;i<nums.length;i++){
            if(nums[i] ==0){
                iCounter++;
            }
            else{
                nums[i-iCounter] = nums[i];
            }
        }
        
        for(int i = (nums.length-iCounter);i<nums.length;i++){
            nums[i]=0;
        }
    }
}