Add solution and test-cases for problem 1295

leetcode/1201-1300/1295.Find-Numbers-with-Even-Number-of-Digits/README.md

@@ -1,28 +1,30 @@
 # [1295.Find Numbers with Even Number of Digits][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 `nums` of integers, return how many of them contain an **even number** of digits.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [12,345,2,6,7896]
+Output: 2
+Explanation: 
+12 contains 2 digits (even number of digits). 
+345 contains 3 digits (odd number of digits). 
+2 contains 1 digit (odd number of digits). 
+6 contains 1 digit (odd number of digits). 
+7896 contains 4 digits (even number of digits). 
+Therefore only 12 and 7896 contain an even number of digits.
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Find Numbers with Even Number of Digits
-```go
 ```
-
+Input: nums = [555,901,482,1771]
+Output: 1 
+Explanation: 
+Only 1771 contains an even number of digits.
+```
 
 ## 结语
 

leetcode/1201-1300/1295.Find-Numbers-with-Even-Number-of-Digits/Solution.go

@@ -12,3 +12,22 @@ func Solution(nums []int) int {
 	}
 	return count
 }
+
+func Solution1(nums []int) int {
+	var isEven func(int) bool
+	isEven = func(n int) bool {
+		c := 0
+		for n > 0 {
+			n /= 10
+			c++
+		}
+		return c&1 == 0
+	}
+	ans := 0
+	for _, n := range nums {
+		if isEven(n) {
+			ans++
+		}
+	}
+	return ans
+}

leetcode/1201-1300/1295.Find-Numbers-with-Even-Number-of-Digits/Solution_test.go

@@ -30,10 +30,34 @@ func TestSolution(t *testing.T) {
 	}
 }
 
-//	压力测试
+func TestSolution1(t *testing.T) {
+	//	测试用例
+	cases := []struct {
+		name   string
+		inputs []int
+		expect int
+	}{
+		{"TestCase", []int{124123, 13425, 123, 65, 1, 54362, 134, 6543, 213}, 3},
+		{"TestCase", []int{}, 0},
+		{"TestCase", []int{4253626756, 3245876, 2345897, 23490}, 1},
+	}
+
+	//	开始测试
+	for i, c := range cases {
+		t.Run(c.name+" "+strconv.Itoa(i), func(t *testing.T) {
+			got := Solution1(c.inputs)
+			if !reflect.DeepEqual(got, c.expect) {
+				t.Fatalf("expected: %v, but got: %v, with inputs: %v",
+					c.expect, got, c.inputs)
+			}
+		})
+	}
+}
+
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }