Merge pull request #823 from 0xff-dev/713

Add solution and test-cases for problem 713

Author: 6boris

leetcode/701-800/0713.Subarray-Product-Less-Than-K/README.md

@@ -1,28 +1,24 @@
 # [713.Subarray Product Less Than 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 an array of integers `nums` and an integer `k`, return the number of contiguous subarrays where the product of all the elements in the subarray is strictly less than `k`.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [10,5,2,6], k = 100
+Output: 8
+Explanation: The 8 subarrays that have product less than 100 are:
+[10], [5], [2], [6], [10, 5], [5, 2], [2, 6], [5, 2, 6]
+Note that [10, 5, 2] is not included as the product of 100 is not strictly less than k.
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Subarray Product Less Than K
-```go
 ```
-
+Input: nums = [1,2,3], k = 0
+Output: 0
+```
 
 ## 结语
 

leetcode/701-800/0713.Subarray-Product-Less-Than-K/Solution.go

@@ -1,5 +1,28 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int, k int) int {
+	cache := make(map[int]int)
+	ans := 0
+	if nums[0] < k {
+		cache[nums[0]] = 1
+		ans++
+	}
+	for i := 1; i < len(nums); i++ {
+		if nums[i] >= k {
+			cache = map[int]int{}
+			continue
+		}
+		next := map[int]int{nums[i]: 1}
+		for kk, v := range cache {
+			if r := nums[i] * kk; r < k {
+				next[r] += v
+			}
+		}
+		cache = next
+		for _, v := range cache {
+			ans += v
+		}
+	}
+
+	return ans
 }

leetcode/701-800/0713.Subarray-Product-Less-Than-K/Solution_test.go

@@ -10,30 +10,30 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		nums   []int
+		k      int
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{10, 5, 2, 6}, 100, 8},
+		{"TestCase2", []int{1, 2, 3}, 0, 0},
 	}
 
 	//	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.nums, 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.nums, 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() {
 }