26. Remove Duplicates from Sorted Array

题目描述

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 nums = [1,1,2],

Your function should return length = 2, with the first two elements of nums being 1 and 2 respectively. It doesn’t matter what you leave beyond the new length.

思路

数组已排序，删除重复的值使每一个值只出现一次，返回新的数组长度。不要开辟额外的数组空间。

class Solution {
public:
    int removeDuplicates(vector<int>& A) {
        int i,  j, n;
        int t = 0;//记录放下来的不重复的值的下标
        n = A.size();
        if(n == 0)
            return 0;
        for(i = 0; i < n-1;i++)
        {
            for(j = i+1; j < n; j++)
            {
                if(A[i] != A[j])//第一次不相等
                {
                    t++;
                    A[t] = A[j];    
                    break;
                }
            }
            i = j-1;
        }
        return t+1;
    }
};