Add solution and test-cases for problem 1015

Author: 0xff-dev

leetcode/1001-1100/1015.Smallest-Integer-Divisible-by-K/README.md

@@ -1,28 +1,37 @@
 # [1015.Smallest Integer Divisible by K][title]
 
-> [!WARNING|style:flat]
-> This question is temporarily unanswered if you have good ideas. Welcome to [Create Pull Request PR](https://github.com/kylesliu/awesome-golang-algorithm)
-
 ## Description
+Given a positive integer `k`, you need to find the **length** of the **smallest** positive integer `n` such that `n` is divisible by `k`, and `n` only contains the digit `1`.
+
+Return the **length** of `n`. If there is no such `n`, return -1.
+
+**Note**: `n` may not fit in a 64-bit signed integer.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
-```
+Given a positive integer k, you need to find the length of the smallest positive integer n such that n is divisible by k, and n only contains the digit 1.
+
+Return the length of n. If there is no such n, return -1.
 
-## 题意
-> ...
+Note: n may not fit in a 64-bit signed integer.
+```
 
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Smallest Integer Divisible by K
-```go
 ```
+Input: k = 2
+Output: -1
+Explanation: There is no such positive integer n divisible by 2.
+```
+
+**Example 3:**
 
+```
+Input: k = 3
+Output: 3
+Explanation: The smallest answer is n = 111, which has length 3.
+```
 
 ## 结语
 

leetcode/1001-1100/1015.Smallest-Integer-Divisible-by-K/Solution.go

@@ -1,5 +1,13 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(k int) int {
+	base := 0
+	// 1, 11, 111,
+	for i := 1; i <= k; i++ {
+		base = (base*10 + 1) % k
+		if base == 0 {
+			return i
+		}
+	}
+	return -1
 }

leetcode/1001-1100/1015.Smallest-Integer-Divisible-by-K/Solution_test.go

@@ -10,12 +10,12 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		inputs int
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", 1, 1},
+		{"TestCase2", 2, -1},
+		{"TestCase3", 3, 3},
 	}
 
 	//	开始测试
@@ -30,10 +30,10 @@ func TestSolution(t *testing.T) {
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }