Add solution and test-cases for problem 2594

Author: 0xff-dev

leetcode/2501-2600/2594.Minimum-Time-to-Repair-Cars/README.md

@@ -0,0 +1,42 @@
+# [2594.Minimum Time to Repair Cars][title]
+
+## Description
+You are given an integer array `ranks` representing the **ranks** of some mechanics. ranksi is the rank of the `ith` mechanic. A mechanic with a rank `r` can repair n cars in `r * n^2` minutes.
+
+You are also given an integer `cars` representing the total number of cars waiting in the garage to be repaired.
+
+Return the **minimum** time taken to repair all the cars.
+
+**Note**: All the mechanics can repair the cars simultaneously.
+
+**Example 1:**
+
+```
+Input: ranks = [4,2,3,1], cars = 10
+Output: 16
+Explanation: 
+- The first mechanic will repair two cars. The time required is 4 * 2 * 2 = 16 minutes.
+- The second mechanic will repair two cars. The time required is 2 * 2 * 2 = 8 minutes.
+- The third mechanic will repair two cars. The time required is 3 * 2 * 2 = 12 minutes.
+- The fourth mechanic will repair four cars. The time required is 1 * 4 * 4 = 16 minutes.
+It can be proved that the cars cannot be repaired in less than 16 minutes.
+```
+
+**Example 2:**
+
+```
+Input: ranks = [5,1,8], cars = 6
+Output: 16
+Explanation: 
+- The first mechanic will repair one car. The time required is 5 * 1 * 1 = 5 minutes.
+- The second mechanic will repair four cars. The time required is 1 * 4 * 4 = 16 minutes.
+- The third mechanic will repair one car. The time required is 8 * 1 * 1 = 8 minutes.
+It can be proved that the cars cannot be repaired in less than 16 minutes.
+```
+
+## 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/minimum-time-to-repair-cars
+[me]: https://github.com/kylesliu/awesome-golang-algorithm

leetcode/2501-2600/2594.Minimum-Time-to-Repair-Cars/Solution.go

@@ -1,5 +1,31 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+import (
+	"math"
+	"slices"
+)
+
+func Solution(ranks []int, cars int) int64 {
+	var ok func(int64) bool
+	ok = func(minutes int64) bool {
+		c := int64(0)
+		for _, r := range ranks {
+			nn := minutes / int64(r)
+			i := int64(math.Sqrt(float64(nn)))
+			c += i
+		}
+		return c >= int64(cars)
+	}
+
+	m := slices.Max(ranks)
+	l, r := int64(0), int64(m)*int64(cars)*int64(cars)+1
+	for l < r {
+		m := (l + r) / 2
+		if ok(m) {
+			r = m
+			continue
+		}
+		l = m + 1
+	}
+	return l
 }

leetcode/2501-2600/2594.Minimum-Time-to-Repair-Cars/Solution_test.go

@@ -10,30 +10,30 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		ranks  []int
+		cars   int
+		expect int64
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{4, 3, 2, 1}, 10, 16},
+		{"TestCase2", []int{5, 1, 8}, 6, 16},
 	}
 
 	//	开始测试
 	for i, c := range cases {
 		t.Run(c.name+" "+strconv.Itoa(i), func(t *testing.T) {
-			got := Solution(c.inputs)
+			got := Solution(c.ranks, c.cars)
 			if !reflect.DeepEqual(got, c.expect) {
-				t.Fatalf("expected: %v, but got: %v, with inputs: %v",
-					c.expect, got, c.inputs)
+				t.Fatalf("expected: %v, but got: %v, with inputs: %v %v",
+					c.expect, got, c.ranks, c.cars)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }