diff --git a/leetcode/0910-Smallest-Range-II/910.Smallest Range II.go b/leetcode/0910-Smallest-Range-II/910.Smallest Range II.go
new file mode 100644
index 00000000..1082b451
--- /dev/null
+++ b/leetcode/0910-Smallest-Range-II/910.Smallest Range II.go	
@@ -0,0 +1,31 @@
+package leetcode
+
+import "sort"
+
+func SmallestRangeII(A []int, K int) int {
+	n := len(A)
+	sort.Ints(A)
+	var ans int = A[n-1] - A[0]
+	for i := 0; i < n-1; i++ {
+		a, b := A[i], A[i+1]
+		high := max(A[n-1]-K, a+K)
+		low := min(A[0]+K, b-K)
+		ans = min(ans, high-low)
+	}
+
+	return ans
+}
+
+func max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
diff --git a/leetcode/0910-Smallest-Range-II/910.Smallest Range II_test.go b/leetcode/0910-Smallest-Range-II/910.Smallest Range II_test.go
new file mode 100644
index 00000000..420c8fba
--- /dev/null
+++ b/leetcode/0910-Smallest-Range-II/910.Smallest Range II_test.go	
@@ -0,0 +1,47 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question910 struct {
+	para910
+	ans910
+}
+
+type para910 struct {
+	A []int
+	K int
+}
+
+type ans910 struct {
+	one int
+}
+
+func Test_Problem910(t *testing.T) {
+
+	qs := []question910{
+
+		{
+			para910{[]int{1}, 0},
+			ans910{0},
+		},
+		{
+			para910{[]int{0, 10}, 2},
+			ans910{6},
+		},
+		{
+			para910{[]int{1, 3, 6}, 3},
+			ans910{3},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 910------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans910, q.para910
+		fmt.Printf("【input】:%v       【output】:%v\n", p, SmallestRangeII(p.A, p.K))
+	}
+	fmt.Printf("\n\n\n")
+}
diff --git a/leetcode/0910-Smallest-Range-II/README.md b/leetcode/0910-Smallest-Range-II/README.md
new file mode 100644
index 00000000..aaa0e90c
--- /dev/null
+++ b/leetcode/0910-Smallest-Range-II/README.md
@@ -0,0 +1,34 @@
+Given an array A of integers, for each integer A[i] we need to choose either x = -K or x = K, and add x to A[i] (only once).
+
+After this process, we have some array B.
+
+Return the smallest possible difference between the maximum value of B and the minimum value of B.
+
+ 
+
+Example 1:
+```
+Input: A = [1], K = 0
+Output: 0
+Explanation: B = [1]
+```
+Example 2:
+```
+Input: A = [0,10], K = 2
+Output: 6
+Explanation: B = [2,8]
+```
+Example 3:
+```
+Input: A = [1,3,6], K = 3
+Output: 3
+Explanation: B = [4,6,3]
+```
+ 
+
+Note:
+
+    1 <= A.length <= 10000
+    0 <= A[i] <= 10000
+    0 <= K <= 10000
+