【Java刷题】之 remove duplicates from

public class Solution {
    public int removeDuplicates(int[] A) {
        int count = 0; 
        if (A == null || A.length == 0) {
            return count;
        }
        count = 1;
        // 从索引1开始遍历，获得不重复个数
        for (int i = 1; i < A.length; i++) {
            if (A[i] != A[i - 1]) {
                count ++;
            }
        }
        
        int uniqueIndex = 1; // 记录已经有了多少个不重复的数字被换到了前面
        for (int i = 1; i < A.length; i++) {
            if (A[i] != A[i-1]) {
                A[uniqueIndex] = A[i];
                uniqueIndex++;
            }

        }
        return count;
    }
}