diff --git a/20201124/main.go b/20201124/main.go
new file mode 100644
index 0000000..0a99813
--- /dev/null
+++ b/20201124/main.go
@@ -0,0 +1,27 @@
+package main
+
+import "strconv"
+
+func main() {
+
+}
+
+func compress(str string) string {
+	var cl int32
+	count := 0
+	var ret string
+	for _, s := range str {
+		if s != cl {
+			cl = s
+			count = 1
+			ret += string(s) + "1"
+		} else {
+			count++
+			ret = ret[:len(ret)-1] + strconv.Itoa(count)
+		}
+		if len(ret) >= len(str) {
+			return str
+		}
+	}
+	return ret
+}
diff --git a/20201124/main_test.go b/20201124/main_test.go
new file mode 100644
index 0000000..6bd8c28
--- /dev/null
+++ b/20201124/main_test.go
@@ -0,0 +1,32 @@
+package main
+
+import "testing"
+
+func Test_compress(t *testing.T) {
+	type args struct {
+		s string
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		{
+			"test1",
+			args{"aabcccccaaa"},
+			"a2b1c5a3",
+		},
+		{
+			"test2",
+			args{"abbccd"},
+			"abbccd",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := compress(tt.args.s); got != tt.want {
+				t.Errorf("compress() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}