26 Remove Duplicates from Sorted Array

链接：https://leetcode.com/problems/remove-duplicates-from-sorted-array/
问题描述：
Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.

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],

Your function should return length = 2, with the first two elements of nums being 1 and 2 respectively. It doesn’t matter what you leave beyond the new length.

Hide Tags Array Two Pointers

去除排序好的数组中i的重复元素。

class Solution {
public:
    int removeDuplicates(vector<int>& nums) {
        if(nums.size()<2)return nums.size();
        int result=0;
        for(int i=1;i<nums.size();i++)
        {
          if(nums[i]!=nums[result])
              nums[++result]=nums[i];
        }
        return result+1;
    }
};

在vector中还有更简单的做法，可以利用unique函数。

class Solution {
public:
    int removeDuplicates(vector<int>& nums) {
        nums.erase( unique(nums.begin(), nums.end() ), nums.end() );
        return nums.size();
    }
};