Merge pull request #1252 from 0xff-dev/1306

Add solution and test-cases for problem 1306

Author: 6boris

leetcode/1301-1400/1306.Jump-Game-III/README.md

@@ -1,28 +1,38 @@
 # [1306.Jump Game III][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 an array of non-negative integers `arr`, you are initially positioned at `start` index of the array. When you are at index `i`, you can jump to `i + arr[i]` or `i - arr[i]`, check if you can reach **any** index with value 0.
+
+Notice that you can not jump outside of the array at any time.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: arr = [4,2,3,0,3,1,2], start = 5
+Output: true
+Explanation: 
+All possible ways to reach at index 3 with value 0 are: 
+index 5 -> index 4 -> index 1 -> index 3 
+index 5 -> index 6 -> index 4 -> index 1 -> index 3
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
-
-### 思路1
-> ...
-Jump Game III
-```go
+```
+Input: arr = [4,2,3,0,3,1,2], start = 0
+Output: true 
+Explanation: 
+One possible way to reach at index 3 with value 0 is: 
+index 0 -> index 4 -> index 1 -> index 3
 ```
 
+**Example 3:**
+
+```
+Input: arr = [3,0,2,1,2], start = 2
+Output: false
+Explanation: There is no way to reach at index 1 with value 0.
+```
 
 ## 结语
 

leetcode/1301-1400/1306.Jump-Game-III/Solution.go

@@ -1,5 +1,26 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(arr []int, start int) bool {
+	l := len(arr)
+	used := make([]bool, l)
+	used[start] = true
+	queue := []int{start}
+	for len(queue) > 0 {
+		nq := make([]int, 0)
+		for _, q := range queue {
+			if arr[q] == 0 {
+				return true
+			}
+			if left := q - arr[q]; left >= 0 && !used[left] {
+				nq = append(nq, left)
+				used[left] = true
+			}
+			if right := q + arr[q]; right < l && !used[right] {
+				nq = append(nq, right)
+				used[right] = true
+			}
+		}
+		queue = nq
+	}
+	return false
 }

leetcode/1301-1400/1306.Jump-Game-III/Solution_test.go

@@ -10,30 +10,31 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
+		inputs []int
+		start  int
 		expect bool
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{4, 2, 3, 0, 3, 1, 2}, 5, true},
+		{"TestCase2", []int{4, 2, 3, 0, 3, 1, 2}, 0, true},
+		{"TestCase3", []int{3, 0, 2, 1, 2}, 2, false},
 	}
 
 	//	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.inputs, c.start)
 			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.inputs, c.start)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }