题目链接：https://leetcode.com/problems/remove-duplicates-from-sorted-array/
题目：
once
Do not allocate extra space for another array, you must do this in place with constant memory.
For example,
Given input array nums = [1,1,2],2, with the first two elements of nums being 1 and 2
思路：
思路跟 一样。
算法：
public int removeDuplicates(int[] nums) {
int count = 0;
for (int i = 1; i < nums.length; i++) {
if (nums[i] == nums[i -1]) {
count++;
}
nums[i - count] = nums[i];
}
return nums.length - count;
}