双指针删除数字重复项

class Solution {
    public int removeDuplicates(int[] nums) {
        if(nums.length == 0){
            return 0;
        }
        int slow = 0, fast = 0;
        while(fast < nums.length){
            if(nums[fast] != nums[slow]){
                slow++;
                nums[slow] = nums[fast];
            }
            fast++;
        }
        //长度都是索引+1
        return slow + 1;
    }
}

class Solution {
    public void moveZeroes(int[] nums) {
        int p = removeElement(nums, 0);
        for(int i = p; i < nums.length; i++){
            nums[i] = 0;
        }
    }
    //双指针移动元素 返回移出目标元素后的数组末尾下标
    public int removeElement(int[] nums, int target){
        int fast = 0, slow = 0;
        while(fast < nums.length){
            if(nums[fast] != target){
                nums[slow] = nums[fast];
                slow++;
            }
            fast++;
        }
        return slow;
    }
}