80. Remove Duplicates from Sorted Array II
Follow up for "Remove Duplicates": What if duplicates are allowed at most twice?
For example,
Given sorted array nums = [1,1,1,2,2,3],
Your function should return length = 5, with the first five elements of nums being 1, 1, 2, 2 and 3. It doesn't matter what you leave beyond the new length.
Solution: Two Pointers
class Solution(object):
def removeDuplicates(self, nums):
"""
:type nums: List[int]
:rtype: int
"""
idx = 0
pre = None
repeat = 0
for num in nums:
if num != pre:
nums[idx] = num
repeat = 1
pre = num
idx += 1
else:
repeat += 1
if repeat <= 2:
nums[idx] = num
idx += 1
return idx