Merge pull request #665 from 0xff-dev/2442

Add solution and test-cases for problem 2442

leetcode/2401-2500/2442.Count-Number-of-Distinct-Integers-After-Reverse-Operations/README.md

@@ -1,28 +1,30 @@
 # [2442.Count Number of Distinct Integers After Reverse Operations][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 an array `nums` consisting of **positive** integers.
+
+You have to take each integer in the array, **reverse its digits**, and add it to the end of the array. You should apply this operation to the original integers in `nums`.
+
+Return the number of **distinct** integers in the final array.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [1,13,10,12,31]
+Output: 6
+Explanation: After including the reverse of each number, the resulting array is [1,13,10,12,31,1,31,1,21,13].
+The reversed integers that were added to the end of the array are underlined. Note that for the integer 10, after reversing it, it becomes 01 which is just 1.
+The number of distinct integers in this array is 6 (The numbers 1, 10, 12, 13, 21, and 31).
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
-
-### 思路1
-> ...
-Count Number of Distinct Integers After Reverse Operations
-```go
 ```
-
+Input: nums = [2,2,2]
+Output: 1
+Explanation: After including the reverse of each number, the resulting array is [2,2,2,2,2,2].
+The number of distinct integers in this array is 1 (The number 2).
+```
 
 ## 结语
 

leetcode/2401-2500/2442.Count-Number-of-Distinct-Integers-After-Reverse-Operations/Solution.go

@@ -1,5 +1,19 @@
 package Solution
 
-func Solution(x bool) bool {
+func rev(n int) int {
+	x := 0
+	for n > 0 {
+		digit := n % 10
+		n /= 10
+		x = x*10 + digit
+	}
 	return x
 }
+func Solution(nums []int) int {
+	set := make(map[int]struct{})
+	for _, n := range nums {
+		set[n] = struct{}{}
+		set[rev(n)] = struct{}{}
+	}
+	return len(set)
+}

leetcode/2401-2500/2442.Count-Number-of-Distinct-Integers-After-Reverse-Operations/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{1, 13, 10, 12, 31}, 6},
+		{"TestCase2", []int{2, 2, 2}, 1},
 	}
 
 	//	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() {
 }