350. Find the intersection of two arrays intersection of two Arrays II

Source: Internet
Author: User

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

given  Nums1  = [1, 2, 2, 1] ,   Nums2  = [2, 2] , Return [2, 2] .


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

Follow up:

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

  1. public class Solution {
  2. public int[] Intersect(int[] nums1, int[] nums2) {
  3. List<int> list = new List<int>();
  4. List<int> intersectList = new List<int>();
  5. list = nums1.ToList<int>();
  6. int num = 0;
  7. int length = nums2.Length;
  8. for(int i=0;i<length;i++)
  9. {
  10. num = nums2[i];
  11. if (list.Contains(nums2[i]))
  12. {
  13. list.Remove(num);
  14. intersectList.Add(num);
  15. }
  16. }
  17. int[] intersect = intersectList.ToArray();
  18. return intersect;
  19. }
  20. }

From for notes (Wiz)

350. Find the intersection of two arrays intersection of two Arrays II

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