Add solution and test-cases for problem 1492

leetcode/1401-1500/1492.The-kth-Factor-of-n/README.md

@@ -0,0 +1,37 @@
+# [1492.The kth Factor of n][title]
+
+## Description
+You are given two positive integers `n` and `k`. A factor of an integer `n` is defined as an integer `i` where `n % i == 0`.
+
+Consider a list of all factors of `n` sorted in **ascending order**, return the `kth` factor in this list or return `-1` if n has less than `k` factors.
+
+**Example 1:**
+
+```
+Input: n = 12, k = 3
+Output: 3
+Explanation: Factors list is [1, 2, 3, 4, 6, 12], the 3rd factor is 3.
+```
+
+**Example 2:**
+
+```
+Input: n = 7, k = 2
+Output: 7
+Explanation: Factors list is [1, 7], the 2nd factor is 7.
+```
+
+**Example 3:**
+
+```
+Input: n = 4, k = 4
+Output: -1
+Explanation: Factors list is [1, 2, 4], there is only 3 factors. We should return -1.
+```
+
+## 结语
+
+如果你同我一样热爱数据结构、算法、LeetCode，可以关注我 GitHub 上的 LeetCode 题解：[awesome-golang-algorithm][me]
+
+[title]: https://leetcode.com/problems/the-kth-factor-of-n/
+[me]: https://github.com/kylesliu/awesome-golang-algorithm

leetcode/1401-1500/1492.The-kth-Factor-of-n/Solution.go

@@ -1,5 +1,14 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(n int, k int) int {
+	i := 1
+	for ; i <= n; i++ {
+		if n%i == 0 {
+			k--
+			if k == 0 {
+				return i
+			}
+		}
+	}
+	return -1
 }

leetcode/1401-1500/1492.The-kth-Factor-of-n/Solution_test.go

@@ -10,30 +10,30 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		n, k   int
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", 12, 3, 3},
+		{"TestCase2", 7, 2, 7},
+		{"TestCase3", 4, 4, -1},
 	}
 
 	//	开始测试
 	for i, c := range cases {
 		t.Run(c.name+" "+strconv.Itoa(i), func(t *testing.T) {
-			got := Solution(c.inputs)
+			got := Solution(c.n, c.k)
 			if !reflect.DeepEqual(got, c.expect) {
-				t.Fatalf("expected: %v, but got: %v, with inputs: %v",
-					c.expect, got, c.inputs)
+				t.Fatalf("expected: %v, but got: %v, with inputs: %v %v",
+					c.expect, got, c.n, c.k)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }