diff --git a/20210109/main.go b/20210109/main.go
new file mode 100644
index 0000000..0be6683
--- /dev/null
+++ b/20210109/main.go
@@ -0,0 +1,16 @@
+package main
+
+func main() {
+
+}
+
+func search(n int, nums []int) int {
+	l := len(nums)
+	c := l / 2
+	for {
+		if c == 0 {
+
+		}
+	}
+	return -1
+}
diff --git a/20210109/main_test.go b/20210109/main_test.go
new file mode 100644
index 0000000..1a9e4f9
--- /dev/null
+++ b/20210109/main_test.go
@@ -0,0 +1,28 @@
+package main
+
+import "testing"
+
+func Test_search(t *testing.T) {
+	type args struct {
+		n    int
+		nums []int
+	}
+	tests := []struct {
+		name string
+		args args
+		want int
+	}{
+		{
+			"test1",
+			args{9, []int{-1, 0, 3, 5, 9, 12}},
+			4,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := search(tt.args.n, tt.args.nums); got != tt.want {
+				t.Errorf("search() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}