LeetCode:Intersection of Two Arrays II

 

Intersection of Two Arrays II

 

 

Total Accepted: 1340 Total Submissions: 3078 Difficulty: Easy

 

Given two arrays, write a function to compute their intersection.

Example:
Given nums1 = [1, 2, 2, 1], nums2 = [2, 2], return [2, 2].

Note:

• Each element in the result should appear as many times as it shows in both arrays.
• The result can be in any order.

 

Follow up:

• What if the given array is already sorted? How would you optimize your algorithm?
• What if nums1's size is small compared to num2's size? Which algorithm is better?
• What if elements of nums2 are stored on disk, and the memory is limited such that you cannot load all elements into the memory at once?

 

 

Subscribe to see which companies asked this question

Hide Tags

 Binary Search Hash Table Two Pointers Sort

Hide Similar Problems

 (E) Intersection of Two Arrays

 

 

 

思路：

承接上题【Intersection of Two Arrays】

不同的是，这里可以有重复元素。因此使用List即可。

 

java code:

 

public class Solution {
    public int[] intersect(int[] nums1, int[] nums2) {        
        
        List list = new ArrayList();
        List interList = new ArrayList();
        
        for(int num:nums1) {
            list.add(num);
        }
        
        for(int i=0;i