Add solution and test-cases for problem 228

Author: 0xff-dev

leetcode/201-300/0228.Summary-Ranges/README.md

@@ -1,28 +1,37 @@
 # [228.Summary Ranges][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
+You are given a **sorted unique** integer array nums.
+
+Return the **smallest sorted** list of ranges that **cover all the numbers in the array exactly**. That is, each element of `nums` is covered by exactly one of the ranges, and there is no integer `x` such that `x` is in one of the ranges but not in `nums`.
+
+Each range `[a,b]` in the list should be output as:
+
+- `"a->b"` if `a != b`
+- `"a"` if `a == b`
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [0,1,2,4,5,7]
+Output: ["0->2","4->5","7"]
+Explanation: The ranges are:
+[0,2] --> "0->2"
+[4,5] --> "4->5"
+[7,7] --> "7"
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
-
-### 思路1
-> ...
-Summary Ranges
-```go
 ```
-
+Input: nums = [0,2,3,4,6,8,9]
+Output: ["0","2->4","6","8->9"]
+Explanation: The ranges are:
+[0,0] --> "0"
+[2,4] --> "2->4"
+[6,6] --> "6"
+[8,9] --> "8->9"
+```
 
 ## 结语
 

leetcode/201-300/0228.Summary-Ranges/Solution.go

@@ -1,5 +1,31 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+import (
+	"fmt"
+)
+
+func Solution(nums []int) []string {
+	result := make([]string, 0)
+	if len(nums) == 0 {
+		return result
+	}
+	start, end := 0, 1
+	for ; end < len(nums); end++ {
+		if nums[end]-nums[end-1] == 1 {
+			continue
+		}
+
+		writeObj := fmt.Sprintf("%d", nums[start])
+		if end-start != 1 {
+			writeObj = fmt.Sprintf("%d->%d", nums[start], nums[end-1])
+		}
+		result = append(result, writeObj)
+		start = end
+	}
+	writeObj := fmt.Sprintf("%d", nums[start])
+	if end-start != 1 {
+		writeObj = fmt.Sprintf("%d->%d", nums[start], nums[end-1])
+	}
+	result = append(result, writeObj)
+	return result
 }

leetcode/201-300/0228.Summary-Ranges/Solution_test.go

@@ -10,12 +10,14 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		inputs []int
+		expect []string
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{0, 1, 2, 4, 5, 7}, []string{"0->2", "4->5", "7"}},
+		{"TestCase2", []int{0, 2, 3, 4, 6, 8, 9}, []string{"0", "2->4", "6", "8->9"}},
+		{"TestCase3", []int{1, 2, 3}, []string{"1->3"}},
+		{"TestCase4", []int{0, 1, 2, 4, 5, 6, 8}, []string{"0->2", "4->6", "8"}},
+		{"TestCase5", []int{1, 2, 3, 5}, []string{"1->3", "5"}},
 	}
 
 	//	开始测试