diff --git a/20201112/main.go b/20201112/main.go
new file mode 100644
index 0000000..498a6dd
--- /dev/null
+++ b/20201112/main.go
@@ -0,0 +1,31 @@
+package main
+
+func main() {
+
+}
+
+func sortFor(n int, src []int) []int {
+	var find []int
+	for _, x := range src {
+		if x == n {
+			find = append(find, x)
+		} else {
+			left = append(left, x)
+		}
+	}
+	return append(find, left...)
+}
+
+func sortFor2(n int, src []int) []int {
+	l := len(src)
+	for i := l - 1; i >= 0; i-- {
+		for j := l - 1; j >= 0; j-- {
+			if src[i] != n && src[j] == n {
+				tmp := src[i]
+				src[i] = src[j]
+				src[j] = tmp
+			}
+		}
+	}
+	return src
+}
diff --git a/20201112/main_test.go b/20201112/main_test.go
new file mode 100644
index 0000000..b117d77
--- /dev/null
+++ b/20201112/main_test.go
@@ -0,0 +1,76 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+)
+
+func Test_sortFor(t *testing.T) {
+	type args struct {
+		n   int
+		src []int
+	}
+	tests := []struct {
+		name string
+		args args
+		want []int
+	}{
+		{
+			"example_1",
+			args{1, []int{5, 1, 6, 1}},
+			[]int{1, 1, 5, 6},
+		},
+		{
+			"example_2",
+			args{2, []int{-1, 2, 3, 5, 2, 2}},
+			[]int{2, 2, 2, -1, 3, 5},
+		},
+		{
+			"example_3",
+			args{1, []int{2, 3, 4, 6}},
+			[]int{2, 3, 4, 6},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := sortFor(tt.args.n, tt.args.src); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("sortFor() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_sortFor2(t *testing.T) {
+	type args struct {
+		n   int
+		src []int
+	}
+	tests := []struct {
+		name string
+		args args
+		want []int
+	}{
+		{
+			"example_1",
+			args{1, []int{5, 1, 6, 1}},
+			[]int{1, 1, 5, 6},
+		},
+		{
+			"example_2",
+			args{2, []int{-1, 2, 3, 5, 2, 2}},
+			[]int{2, 2, 2, -1, 3, 5},
+		},
+		{
+			"example_3",
+			args{1, []int{2, 3, 4, 6}},
+			[]int{2, 3, 4, 6},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := sortFor2(tt.args.n, tt.args.src); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("sortFor2() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}