[LeetCode][Java] Remove Duplicates from Sorted Array II

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題目:

Follow up for "Remove Duplicates":
What if duplicates are allowed at most twice?

For example,
Given sorted array nums = [1,1,1,2,2,3],

Your function should return length = 5, with the first five elements of nums being 1122 and 3. It doesn‘t matter what you leave beyond the new length.

題意:

伴隨著問題"Remove Duplicates":

如果重複的元素最多允許出現兩次呢?

比如:

給定有序數組 nums = [1,1,1,2,2,3],

你的函數應該返回 length = 5, 數組nums中的前五個元素為1122 and 3.數組新的長度後面剩餘的元素無所謂。

演算法分析:

將前兩個重複元素放入list中,然後跳轉到下一個不同元素,繼續上述操作。最後將list元素重新添加到數組中

AC代碼:

<span style="font-family:Microsoft YaHei;font-size:12px;">public class Solution {    public int removeDuplicates(int[] nums)     {if(nums==null||nums.length==0) return 0;    ArrayList<Integer> list = new ArrayList<Integer>();for(int i=0;i<nums.length;i++){if(i==nums.length-1){list.add(nums[i]);break;}if(nums[i]==nums[i+1]){while(nums[i]==nums[i+1]){i++;if(i+1>nums.length-1)break;}list.add(nums[i]);list.add(nums[i]);}elselist.add(nums[i]);}for(int i=0;i<list.size();i++)nums[i]=list.get(i);    return list.size();    }}</span>


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[LeetCode][Java] Remove Duplicates from Sorted Array II

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