添加 704. 二分查找 go 版本

problems/0704.二分查找.md

@@ -210,6 +210,47 @@ class Solution:
 
 Go：
 
+（版本一）左闭右闭区间
+
+```go
+func search(nums []int, target int) int {
+    high := len(nums)-1
+    low := 0
+    for low <= high {
+        mid := low + (high-low)/2
+        if nums[mid] == target {
+            return mid
+        } else if nums[mid] > target {
+            high = mid-1
+        } else {
+            low = mid+1
+        }
+    }
+    return -1
+}
+```
+
+（版本二）左闭右开区间
+
+```go
+func search(nums []int, target int) int {
+    high := len(nums)
+    low := 0
+    for low < high {
+        mid := low + (high-low)/2
+        if nums[mid] == target {
+            return mid
+        } else if nums[mid] > target {
+            high = mid
+        } else {
+            low = mid+1
+        }
+    }
+    return -1
+}
+```
+
+