Add two versions of intersection function in Go

problems/0349.两个数组的交集.md

@@ -210,6 +210,8 @@ class Solution:
 
 ### Go：
 
+（版本一）使用字典和集合
+
 ```go
 func intersection(nums1 []int, nums2 []int) []int {
     set:=make(map[int]struct{},0)  // 用map模拟set
@@ -230,6 +232,28 @@ func intersection(nums1 []int, nums2 []int) []int {
 }
 ```
 
+（版本二）使用数组
+
+```go
+func intersection(nums1 []int, nums2 []int) []int {
+    count1 := make([]int, 1001, 1001)
+    count2 := make([]int, 1001, 1001)
+    res := make([]int, 0)
+    for _, v := range nums1 {
+        count1[v] = 1
+    }
+    for _, v := range nums2 {
+        count2[v] = 1
+    }
+    for i := 0; i <= 1000; i++ {
+        if count1[i] + count2[i] == 2 {
+            res = append(res, i)
+        }
+    }
+    return res
+}
+```
+
 ### JavaScript:
 
 ```js