力扣 283. 移动零

双指针

def moveZeroes(nums):
    """
    Do not return anything, modify nums in-place instead.
    """        
    s, e, L = 0, 0, len(nums)
    while s < L and e < L:
        # 找0值
        while s < e and nums[s] != 0: s += 1
        # 找非0值
        while e < L and nums[e] == 0: e += 1
        if s < L and e < L: 
            nums[s], nums[e] = nums[e], nums[s]
            s += 1
            e += 1