Create 350. Intersection of Two Arrays II.md

350. Intersection of Two Arrays II.md

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+# [350. Intersection of Two Arrays II](https://leetcode.com/problems/intersection-of-two-arrays-ii/description/)
+# 思路
+基本同[349. Intersection of Two Arrays](https://leetcode.com/problems/intersection-of-two-arrays/description/), 只是题结果中可以出现重复元素，
+则先对两个数组进行排序，然后再用两个指针遍历一遍数组，合理更新指针即可获得两个数组的相同元素。   
+时间复杂度O(nlogn)
+# C++
+```
+class Solution {
+public:
+    vector<int> intersect(vector<int>& nums1, vector<int>& nums2) {
+        sort(nums1.begin(), nums1.end());
+        sort(nums2.begin(), nums2.end());
+        vector<int>res;
+        int p1 = 0, p2 = 0;
+        while(p1 < nums1.size() && p2 < nums2.size()){
+            if(nums1[p1] < nums2[p2]) p1++;
+            else if(nums1[p1] > nums2[p2]) p2++;
+            else{
+                res.push_back(nums1[p1]);
+                p1++;
+                p2++;
+            }
+        }
+        return res;
+    }
+};
+```