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Commit 702d0b1

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Merge pull request #399 from 0xff-dev/2104
Add solution and test-cases for problem 2104
2 parents c45c772 + d1a6003 commit 702d0b1

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‎leetcode/2101-2200/2104.Sum-of-Subarray-Ranges/README.md

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# [2104.Sum of Subarray Ranges][title]
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> [!WARNING|style:flat]
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> This question is temporarily unanswered if you have good ideas. Welcome to [Create Pull Request PR](https://github.com/kylesliu/awesome-golang-algorithm)
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## Description
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You are given an integer array `nums`. The **range** of a subarray of `nums` is the difference between the largest and smallest element in the subarray.
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Return the **sum of all** subarray ranges of `nums`.
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A subarray is a contiguous **non-empty** sequence of elements within an array.
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**Example 1:**
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```
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Input: a = "11", b = "1"
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Output: "100"
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Input: nums = [1,2,3]
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Output: 4
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Explanation: The 6 subarrays of nums are the following:
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[1], range = largest - smallest = 1 - 1 = 0
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[2], range = 2 - 2 = 0
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[3], range = 3 - 3 = 0
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[1,2], range = 2 - 1 = 1
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[2,3], range = 3 - 2 = 1
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[1,2,3], range = 3 - 1 = 2
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So the sum of all ranges is 0 + 0 + 0 + 1 + 1 + 2 = 4.
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```
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## 题意
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> ...
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## 题解
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**Example 2:**
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### 思路1
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> ...
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Sum of Subarray Ranges
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```go
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```
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Input: nums = [1,3,3]
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Output: 4
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Explanation: The 6 subarrays of nums are the following:
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[1], range = largest - smallest = 1 - 1 = 0
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[3], range = 3 - 3 = 0
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[3], range = 3 - 3 = 0
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[1,3], range = 3 - 1 = 2
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[3,3], range = 3 - 3 = 0
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[1,3,3], range = 3 - 1 = 2
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So the sum of all ranges is 0 + 0 + 0 + 2 + 0 + 2 = 4.
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```
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**Example 3:**
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```
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Input: nums = [4,-2,-3,4,1]
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Output: 59
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Explanation: The sum of all subarray ranges of nums is 59.
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```
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## 结语
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package Solution
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func Solution(x bool) bool {
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return x
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// 看解析可以用单调栈完成
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func Solution(nums []int) int64 {
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length := len(nums)
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max, min := make([]int, length), make([]int, length)
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max[0], min[0] = nums[0], nums[0]
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for i := 1; i < length; i++ {
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max[i] = nums[i-1]
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min[i] = nums[i-1]
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if nums[i] > max[i] {
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max[i] = nums[i]
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}
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if nums[i] < min[i] {
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min[i] = nums[i]
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}
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}
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ans := int64(0)
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for l := 2; l <= length; l++ {
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m, n := max[l-1], min[l-1]
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ans += int64(m - n)
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// start
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for i := 1; i <= length-l; i++ {
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newItem := nums[i+l-1]
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if newItem > m {
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m = newItem
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}
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if newItem < n {
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n = newItem
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}
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ans += int64(m - n)
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}
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}
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return ans
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}

‎leetcode/2101-2200/2104.Sum-of-Subarray-Ranges/Solution_test.go

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// 测试用例
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cases := []struct {
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name string
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inputs bool
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expect bool
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inputs []int
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expect int64
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}{
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{"TestCase", true, true},
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{"TestCase", true, true},
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{"TestCase", false, false},
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{"TestCase1", []int{1, 2, 3}, 4},
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{"TestCase2", []int{1, 3, 3}, 4},
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{"TestCase3", []int{4, -2, -3, 4, 1}, 59},
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}
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// 开始测试
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}
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}
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//压力测试
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//压力测试
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func BenchmarkSolution(b *testing.B) {
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}
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//使用案列
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//使用案列
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func ExampleSolution() {
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}

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