Remove Duplicates from Sorted Array

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 A = [1,1,2],

Your function should return length = 2, and A is now [1,2].

分析：剔除数组中的重复数字，并返回新数组的长度。运行时间：37ms

class Solution {
public:
    int removeDuplicates(int A[], int n) {
        if(n <= 1) return n;
        
        int length = 1;
        for(int i = 1; i < n; i++){
            if(A[i] != A[i-1]) A[length++] = A[i];
        }
        return length;
    }
};