feat: 1619. Mean of Array After Removing Some Elements (#71)

Signed-off-by: ashing <axingfly@gmail.com>

leetcode/1619/1619. Mean of Array After Removing Some Elements.go

@@ -0,0 +1,13 @@
+package _619
+
+import "sort"
+
+func trimMean(arr []int) float64 {
+	sort.Ints(arr)
+	n := len(arr)
+	sum := 0
+	for _, x := range arr[n/20 : 19*n/20] {
+		sum += x
+	}
+	return float64(sum*10) / float64(n*9)
+}

leetcode/1619/1619. Mean of Array After Removing Some Elements_test.go

@@ -0,0 +1,31 @@
+package _619
+
+import (
+	"testing"
+)
+
+func Test_trimMean(t *testing.T) {
+	type args struct {
+		arr []int
+	}
+	tests := []struct {
+		name string
+		args args
+		want float64
+	}{
+		{
+			name: "one",
+			args: args{
+				[]int{1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3},
+			},
+			want: 2.00000,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := trimMean(tt.args.arr); got != tt.want {
+				t.Errorf("trimMean() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}