350.求两个数组的交集 Intersection of Two Arrays II

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 nums2‘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?

public class Solution {
    public int[] Intersect(int[] nums1, int[] nums2) {
        List<int> list = new List<int>();
        List<int> intersectList = new List<int>();
        list = nums1.ToList<int>();

        int num = 0;
        int length = nums2.Length;
        for(int i=0;i<length;i++)
        {
            num = nums2[i];
            if (list.Contains(nums2[i]))
            {
                list.Remove(num);
                intersectList.Add(num);
            }
        }

        int[] intersect = intersectList.ToArray();
        return intersect;
    }
}

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