Merge pull request #549 from 0xff-dev/1920

Add solution and test-cases for problem 1920

leetcode/1901-2000/1920.Build-Array-from-Permutation/README.md

@@ -1,28 +1,31 @@
 # [1920.Build Array from Permutation][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 **zero-based permutation** nums (**0-indexed**), build an array ans of the **same length** where `ans[i] = nums[nums[i]]` for each `0 <= i < nums.length` and return it.
+
+A **zero-based permutation** `nums` is an array of **distinct** integers from `0` to `nums.length - 1` (**inclusive**).
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [0,2,1,5,3,4]
+Output: [0,1,2,4,5,3]
+Explanation: The array ans is built as follows: 
+ans = [nums[nums[0]], nums[nums[1]], nums[nums[2]], nums[nums[3]], nums[nums[4]], nums[nums[5]]]
+    = [nums[0], nums[2], nums[1], nums[5], nums[3], nums[4]]
+    = [0,1,2,4,5,3]
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Build Array from Permutation
-```go
 ```
-
+Input: nums = [5,0,1,2,3,4]
+Output: [4,5,0,1,2,3]
+Explanation: The array ans is built as follows:
+ans = [nums[nums[0]], nums[nums[1]], nums[nums[2]], nums[nums[3]], nums[nums[4]], nums[nums[5]]]
+    = [nums[5], nums[0], nums[1], nums[2], nums[3], nums[4]]
+    = [4,5,0,1,2,3]
+```
 
 ## 结语
 

leetcode/1901-2000/1920.Build-Array-from-Permutation/Solution.go

@@ -1,5 +1,9 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int) []int {
+	ans := make([]int, len(nums))
+	for idx, item := range nums {
+		ans[idx] = nums[item]
+	}
+	return ans
 }

leetcode/1901-2000/1920.Build-Array-from-Permutation/Solution_test.go

@@ -10,12 +10,11 @@ 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", []int{0, 2, 1, 5, 3, 4}, []int{0, 1, 2, 4, 5, 3}},
+		{"TestCase2", []int{5, 0, 1, 2, 3, 4}, []int{4, 5, 0, 1, 2, 3}},
 	}
 
 	//	开始测试
@@ -30,10 +29,10 @@ 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() {
 }