feat(Go-Tool)：修改单测位置，添加lomuto查找第k小元素算法代码及其单测（分治法）

util/rand/RandByWeight_test.go

@@ -0,0 +1,50 @@
+/*
+ *  @Author : huangzj
+ *  @Time : 2020/6/29 17:16
+ *  @Description：
+ */
+
+package rand
+
+import (
+	"fmt"
+	"strconv"
+	"testing"
+)
+
+func TestRandByWeight(t *testing.T) {
+	fmt.Printf(strconv.Itoa(GetRandValueByWeight([]int{10, 20, 30, 50})))
+
+	list, list1 := GetAwardByWeight([][]int{{2, 2, 10}, {3, 3, 4}})
+	for _, r := range list {
+		fmt.Println(strconv.Itoa(r))
+	}
+	for _, r := range list1 {
+		fmt.Println(strconv.Itoa(r))
+	}
+
+	fmt.Println(GetByWeight([]int{10, 11, 12, 13}, []int{20, 30, 40, 50}))
+
+	list2, list3 := GetAwardByWeightWithLeftAward([][]int{{2, 3, 30}, {3, 3, 40}})
+	for _, r := range list2 {
+		fmt.Println(strconv.Itoa(r))
+	}
+	for _, r := range list3 {
+		for _, r1 := range r {
+			fmt.Println(strconv.Itoa(r1))
+		}
+	}
+
+	list4 := GetCountAwardsFromPool([][]int{{1, 2, 30}, {2, 2, 40}, {3, 2, 50}}, 2)
+	for _, r := range list4 {
+		for _, r1 := range r {
+			fmt.Println(strconv.Itoa(r1))
+		}
+	}
+
+	list5 := GetAwardByPercentage([][]int{{20, 3, 99}, {90, 3, 10}, {12, 3, 22}}, 100)
+	for _, r := range list5 {
+		fmt.Println(strconv.Itoa(r))
+	}
+
+}

util/rand/Rand_test.go

@@ -0,0 +1,24 @@
+/*
+ *  @Author : huangzj
+ *  @Time : 2020/6/29 17:15
+ *  @Description：
+ */
+
+package rand
+
+import (
+	"fmt"
+	"strconv"
+	"testing"
+)
+
+func TestRand(t *testing.T) {
+	fmt.Printf(strconv.Itoa(GetRandInt(100, 2000)))
+	for _, r := range GetRandIntNoRepeat(10, 100, 200) {
+		fmt.Printf(strconv.Itoa(r))
+	}
+
+	for _, r := range GetDiffNum([]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13}, 10) {
+		fmt.Printf(strconv.Itoa(r))
+	}
+}