Merge pull request #1040 from 0xff-dev/2729

Add solution and test-cases for problem 2729

leetcode/2701-2800/2729.Check-if-The-Number-is-Fascinating/README.md

@@ -0,0 +1,35 @@
+# [2729.Check if The Number is Fascinating][title]
+
+## Description
+You are given an integer `n` that consists of exactly `3` digits.
+
+We call the number `n` **fascinating** if, after the following modification, the resulting number contains all the digits from `1` to `9` **exactly** once and does not contain any `0`'s:
+
+- **Concatenate** `n` with the numbers `2 * n` and `3 * n`.
+
+Return `true` if `n` is fascinating, or `false` otherwise.
+
+**Concatenating** two numbers means joining them together. For example, the concatenation of `121` and `371` is `121371`.
+
+**Example 1:**
+
+```
+Input: n = 192
+Output: true
+Explanation: We concatenate the numbers n = 192 and 2 * n = 384 and 3 * n = 576. The resulting number is 192384576. This number contains all the digits from 1 to 9 exactly once.
+```
+
+**Example 2:**
+
+```
+Input: n = 100
+Output: false
+Explanation: We concatenate the numbers n = 100 and 2 * n = 200 and 3 * n = 300. The resulting number is 100200300. This number does not satisfy any of the conditions.
+```
+
+## 结语
+
+如果你同我一样热爱数据结构、算法、LeetCode，可以关注我 GitHub 上的 LeetCode 题解：[awesome-golang-algorithm][me]
+
+[title]: https://leetcode.com/problems/check-if-the-number-is-fascinating
+[me]: https://github.com/kylesliu/awesome-golang-algorithm

leetcode/2701-2800/2729.Check-if-The-Number-is-Fascinating/Solution.go

@@ -1,5 +1,25 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(n int) bool {
+	checker := [10]int{}
+	var checkNum func(n int)
+	checkNum = func(n int) {
+		for n > 0 {
+			x := n % 10
+			checker[x]++
+			n /= 10
+		}
+	}
+	checkNum(n)
+	checkNum(n + n)
+	checkNum(n + n + n)
+	if checker[0] > 0 {
+		return false
+	}
+	for i := 1; i < 10; i++ {
+		if checker[i] != 1 {
+			return false
+		}
+	}
+	return true
 }

leetcode/2701-2800/2729.Check-if-The-Number-is-Fascinating/Solution_test.go

@@ -10,12 +10,11 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
+		inputs int
 		expect bool
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", 192, true},
+		{"TestCase2", 100, false},
 	}
 
 	//	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() {
 }