diff --git a/leetcode/2401-2500/2491.Divide-Players-Into-Teams-of-Equal-Skill/Solution.go b/leetcode/2401-2500/2491.Divide-Players-Into-Teams-of-Equal-Skill/Solution.go
index ebe45e34..387d3dd7 100644
--- a/leetcode/2401-2500/2491.Divide-Players-Into-Teams-of-Equal-Skill/Solution.go
+++ b/leetcode/2401-2500/2491.Divide-Players-Into-Teams-of-Equal-Skill/Solution.go
@@ -19,3 +19,32 @@ func Solution(skill []int) int64 {
 	}
 	return ans
 }
+
+func Solution1(skill []int) int64 {
+	l := len(skill) / 2
+	sum := 0
+	for _, n := range skill {
+		sum += n
+	}
+	if sum%l != 0 {
+		return -1
+	}
+	target := sum / l
+	count := make(map[int]int)
+	for _, n := range skill {
+		count[n]++
+	}
+
+	ans := int64(0)
+	for k, c := range count {
+		need := target - k
+		if need == k && c&1 == 1 {
+			return -1
+		}
+		if v, ok := count[need]; !ok || v != c {
+			return -1
+		}
+		ans += int64(k) * int64(need) * int64(c)
+	}
+	return ans / 2
+}
diff --git a/leetcode/2401-2500/2491.Divide-Players-Into-Teams-of-Equal-Skill/Solution_test.go b/leetcode/2401-2500/2491.Divide-Players-Into-Teams-of-Equal-Skill/Solution_test.go
index 5c922e50..005283bf 100644
--- a/leetcode/2401-2500/2491.Divide-Players-Into-Teams-of-Equal-Skill/Solution_test.go
+++ b/leetcode/2401-2500/2491.Divide-Players-Into-Teams-of-Equal-Skill/Solution_test.go
@@ -30,6 +30,30 @@ func TestSolution(t *testing.T) {
 	}
 }
 
+func TestSolution1(t *testing.T) {
+	//	测试用例
+	cases := []struct {
+		name   string
+		inputs []int
+		expect int64
+	}{
+		{"TestCase1", []int{3, 2, 5, 1, 3, 4}, 22},
+		{"TestCase2", []int{3, 4}, 12},
+		{"TestCase3", []int{1, 1, 2, 3}, -1},
+	}
+
+	//	开始测试
+	for i, c := range cases {
+		t.Run(c.name+" "+strconv.Itoa(i), func(t *testing.T) {
+			got := Solution1(c.inputs)
+			if !reflect.DeepEqual(got, c.expect) {
+				t.Fatalf("expected: %v, but got: %v, with inputs: %v",
+					c.expect, got, c.inputs)
+			}
+		})
+	}
+}
+
 // 压力测试
 func BenchmarkSolution(b *testing.B) {
 }