题目：
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.
思路：
向前多判断一步
package array; public class RemoveDuplicatesFromSortedArrayII { public int removeDuplicates(int[] nums) { int len = 0; if (nums == null || (len = nums.length) < 2) return len; int start = 1; for (int i = 2; i < len; ++i) { if (nums[i] != nums[start] || nums[start] != nums[start - 1]) { ++start; nums[start] = nums[i]; } } return start + 1; } public static void main(String[] args) { // TODO Auto-generated method stub int[] nums = { 1,1,1,2,2,3 }; RemoveDuplicatesFromSortedArrayII r = new RemoveDuplicatesFromSortedArrayII(); System.out.println(r.removeDuplicates(nums)); } }
LeetCode - Remove Duplicates from Sorted Array II
原文：http://www.cnblogs.com/shuaiwhu/p/5094791.html