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]
.
这道题目采用双指针就可以解决问题了,遍历一遍数组,O(N)复杂度
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;
}
};