Add solution and test-cases for problem 949

leetcode/901-1000/0949.Largest-Time-for-Given-Digits/README.md

@@ -1,28 +1,27 @@
 # [949.Largest Time for Given 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 `arr` of 4 digits, find the latest 24-hour time that can be made using each digit **exactly once**.
+
+24-hour times are formatted as `"HH:MM"`, where `HH` is between `00` and `23`, and `MM` is between `00` and `59`. The earliest 24-hour time is `00:00`, and the latest is `23:59`.
+
+Return the latest 24-hour time in `"HH:MM"` format. If no valid time can be made, return an empty string.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: arr = [1,2,3,4]
+Output: "23:41"
+Explanation: The valid 24-hour times are "12:34", "12:43", "13:24", "13:42", "14:23", "14:32", "21:34", "21:43", "23:14", and "23:41". Of these times, "23:41" is the latest.
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
-
-### 思路1
-> ...
-Largest Time for Given Digits
-```go
 ```
-
+Input: arr = [5,5,5,5]
+Output: ""
+Explanation: There are no valid 24-hour times as "55:55" is not valid.
+```
 
 ## 结语
 

leetcode/901-1000/0949.Largest-Time-for-Given-Digits/Solution.go

@@ -1,5 +1,37 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+import "fmt"
+
+func Solution(arr []int) string {
+	in := make(map[int]int)
+	for _, n := range arr {
+		in[n]++
+	}
+	var a, b, c, d int
+	for i := 23; i >= 0; i-- {
+		a, b = i/10, i%10
+		if a == b {
+			if in[a] < 2 {
+				continue
+			}
+		} else if in[a] < 1 || in[b] < 1 {
+			continue
+		}
+		in[a]--
+		in[b]--
+
+		for j := 59; j >= 0; j-- {
+			c, d = j/10, j%10
+			if c == d {
+				if in[c] >= 2 {
+					return fmt.Sprintf("%d%d:%d%d", a, b, c, d)
+				}
+			} else if in[c] > 0 && in[d] > 0 {
+				return fmt.Sprintf("%d%d:%d%d", a, b, c, d)
+			}
+		}
+		in[a]++
+		in[b]++
+	}
+	return ""
 }

leetcode/901-1000/0949.Largest-Time-for-Given-Digits/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 string
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{1, 2, 3, 4}, "23:41"},
+		{"TestCase2", []int{5, 5, 5, 5}, ""},
 	}
 
 	//	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() {
 }