diff --git a/2112/211231-CN-BruteForce.go b/2112/211231-CN-BruteForce.go
new file mode 100644
index 0000000..08b43c1
--- /dev/null
+++ b/2112/211231-CN-BruteForce.go
@@ -0,0 +1,80 @@
+package main
+
+import (
+	"fmt"
+	"math"
+	"sync"
+	"time"
+)
+
+type taskArgument struct {
+	L uint32
+	R uint32
+}
+
+var (
+	tasks        = make(chan taskArgument)
+	printContent = make(chan string)
+)
+
+const (
+	step  = 500000
+	limit = 100000000
+)
+
+func taskExecutor(mutex *sync.Mutex) {
+	mutex.Lock()
+	defer mutex.Unlock()
+	for {
+		args, ok := <-tasks
+		if !ok {
+			return
+		}
+		for i := args.L; i <= args.R; i++ {
+			var s uint32 = 1
+			lim := uint32(math.Sqrt(float64(i) + 0.5))
+			for j := uint32(2); j <= lim; j++ {
+				if i%j == 0 {
+					s += j + i/j
+				}
+			}
+			if s == i {
+				printContent <- fmt.Sprintf("%d", i)
+			}
+		}
+		printContent <- fmt.Sprintf("Finishing searching [%d, %d]", args.L, args.R)
+	}
+}
+
+func main() {
+	go Printer()
+	threads := 20
+	locks := make([]sync.Mutex, threads)
+	start := time.Now()
+	for i := 0; i < threads; i++ {
+		go taskExecutor(&locks[i])
+	}
+	for i := 1; i < limit; i += step {
+		tasks <- taskArgument{
+			L: uint32(i),
+			R: uint32(i + step - 1),
+		}
+	}
+	close(tasks)
+	time.Sleep(1 * time.Second)
+	for i := 0; i < threads; i++ {
+		locks[i].Lock()
+	}
+	end := time.Now()
+	fmt.Println(end.Sub(start))
+}
+
+func Printer() {
+	for {
+		s, ok := <-printContent
+		if !ok {
+			return
+		}
+		fmt.Println(s)
+	}
+}
\ No newline at end of file
diff --git a/2112/211231-CN.cpp b/2112/211231-CN.cpp
index 85c81e2..8188fcb 100644
--- a/2112/211231-CN.cpp
+++ b/2112/211231-CN.cpp
@@ -32,85 +32,5 @@ int main() {
 
 /**
  * Use this golang program to do multi-threaded searching:
- *
-package main
-
-import (
-	"fmt"
-	"math"
-	"sync"
-	"time"
-)
-
-type taskArgument struct {
-	L uint32
-	R uint32
-}
-
-var (
-	tasks        = make(chan taskArgument)
-	printContent = make(chan string)
-)
-
-const (
-	step  = 500000
-	limit = 100000000
-)
-
-func taskExecutor(mutex *sync.Mutex) {
-	mutex.Lock()
-	defer mutex.Unlock()
-	for {
-		args, ok := <-tasks
-		if !ok {
-			return
-		}
-		for i := args.L; i <= args.R; i++ {
-			var s uint32 = 1
-			lim := uint32(math.Sqrt(float64(i) + 0.5))
-			for j := uint32(2); j <= lim; j++ {
-				if i%j == 0 {
-					s += j + i/j
-				}
-			}
-			if s == i {
-				printContent <- fmt.Sprintf("%d", i)
-			}
-		}
-		printContent <- fmt.Sprintf("Finishing searching [%d, %d]", args.L, args.R)
-	}
-}
-
-func main() {
-	go Printer()
-	threads := 20
-	locks := make([]sync.Mutex, threads)
-	start := time.Now()
-	for i := 0; i < threads; i++ {
-		go taskExecutor(&locks[i])
-	}
-	for i := 1; i < limit; i += step {
-		tasks <- taskArgument{
-			L: uint32(i),
-			R: uint32(i + step - 1),
-		}
-	}
-	close(tasks)
-	time.Sleep(1 * time.Second)
-	for i := 0; i < threads; i++ {
-		locks[i].Lock()
-	}
-	end := time.Now()
-	fmt.Println(end.Sub(start))
-}
-
-func Printer() {
-	for {
-		s, ok := <-printContent
-		if !ok {
-			return
-		}
-		fmt.Println(s)
-	}
-}
+ * Refer to 211231-CN-BruteForce.go
  */
\ No newline at end of file