LeetCode 026. Remove Duplicates from Sorted Array

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].

這道題目採用雙指針就可以解決問題了，遍歷一遍數組，O(N)複雜度

class Solution 
{
public:
    int removeDuplicates(int A[], int n) 
    {
        if(n < 2)
            return n;
        int length = 0;
        int i;
        for(i=0; i<n-1; i++)
            if(A[i]!=A[i+1])
                A[length++] = A[i];
        A[length++] = A[i];
        return length;
    }
};