Remove Duplicates from Sorted Array

将一个排好序的数组中重复的数字删除

思路：维护头和尾指针，头指针始终指向最后一个不重复的数字，尾指针不断向数组尾部探索找到不重复的值之后将其拷贝到头指针

class Solution {
public:
    int removeDuplicates(int A[], int n) {
        if (n <= 1)
        {
            return n;
        }
        int count = 1, head = 0, tail = 1;
        while (tail < n)
        {
            while (A[tail] == A[head])
                tail++;
            if (tail < n)
            {
                A[++head] = A[tail++];
                count++;
            }
        }
        return count;
    }
};

来自为知笔记(Wiz)