添加Go语言题解

animation-simulation/二分查找及其变种/leetcode34查找第一个位置和最后一个位置.md

@@ -166,3 +166,45 @@ class Solution {
     }
 }
 ```
+
+Go Code:
+
+```go
+func searchRange(nums []int, target int) []int {
+    upper := upperBound(nums, target)
+    lower := lowerBound(nums, target)
+
+    if (upper < lower) {
+        return []int{-1, -1}
+    }
+    return []int{lower, upper}
+}
+
+// upperBound 计算上边界
+func upperBound(nums []int, target int) int {
+    l, r := 0, len(nums) - 1
+    for l <= r {
+        m := l + (r - l) / 2
+        if target >= nums[m] {
+            l = m + 1
+        } else if target < nums[m] {
+            r = m - 1
+        }
+    }
+    return r
+}
+
+// lowerBound 计算下边界
+func lowerBound(nums []int, target int) int {
+    l, r := 0, len(nums) - 1
+    for l <= r {
+        m := l + (r - l) / 2
+        if target <= nums[m] {
+            r = m - 1
+        } else if target > nums[m] {
+            l = m + 1
+        }
+    }
+    return l
+}
+```