LeetCodeRemove Duplicates from Sorted Array

Posted 2020-10-17

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].

/**
 * MyCode
 */
int Function(int *arr,int len)
{
    int newlen = len;

    for(int i = 1;i < newlen; i++)
    {
        int flag = 0;
        for(int j = 0;j < i; j++)
        {
            if(arr[j] == arr[i])
            {
                flag = 1;
                break;
            }
        }

        if(flag == 1)
        {
            for(int k = i+1;k < newlen; k++)
            {
                arr[k-1] = arr[k];
            }
            newlen--;
        }
    }

    return newlen;
}

　　

//标准答案

int Function1(int *arr,int len)
{
    int index = 0;
    for(int i = 1;i < len;i++)
    {
        if(arr[index] != arr[i])
            arr[++index] = arr[i];
    }
    return index + 1;
}