Add solution and test-cases for problem 849

leetcode/801-900/0849.Maximize-Distance-to-Closest-Person/README.md

@@ -1,28 +1,43 @@
 # [849.Maximize Distance to Closest Person][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 representing a row of `seats` where `seats[i] = 1` represents a person sitting in the `ith` seat, and `seats[i] = 0` represents that the `ith` seat is empty **(0-indexed)**.
+
+There is at least one empty seat, and at least one person sitting.
+
+Alex wants to sit in the seat such that the distance between him and the closest person to him is maximized. 
+
+Return that maximum distance to the closest person.
+
+**Example 1:**  
 
-**Example 1:**
+![1](./1.jpg)
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: seats = [1,0,0,0,1,0,1]
+Output: 2
+Explanation: 
+If Alex sits in the second open seat (i.e. seats[2]), then the closest person has distance 2.
+If Alex sits in any other open seat, the closest person has distance 1.
+Thus, the maximum distance to the closest person is 2.
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
-
-### 思路1
-> ...
-Maximize Distance to Closest Person
-```go
 ```
+Input: seats = [1,0,0,0]
+Output: 3
+Explanation: 
+If Alex sits in the last seat (i.e. seats[3]), the closest person is 3 seats away.
+This is the maximum distance possible, so the answer is 3.
+```
+
+**Example 3:**
 
+```
+Input: seats = [0,1]
+Output: 1
+```
 
 ## 结语
 

leetcode/801-900/0849.Maximize-Distance-to-Closest-Person/Solution.go

@@ -1,5 +1,30 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(seats []int) int {
+	ans := 0
+	pre := -1
+	i := 0
+	for ; i < len(seats); i++ {
+		s := seats[i]
+		if s == 0 {
+			continue
+		}
+		if pre == -1 {
+			ans = i
+		} else {
+			diff := i - pre - 1
+			add := 0
+			if diff&1 == 1 {
+				add = 1
+			}
+			diff = diff/2 + add
+			ans = max(ans, diff)
+		}
+		pre = i
+	}
+	if seats[i-1] != 1 {
+		diff := i - pre - 1
+		ans = max(ans, diff)
+	}
+	return ans
 }

leetcode/801-900/0849.Maximize-Distance-to-Closest-Person/Solution_test.go

@@ -10,12 +10,12 @@ 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, 0, 0, 0, 1, 0, 1}, 2},
+		{"TestCase2", []int{1, 0, 0, 0}, 3},
+		{"TestCase3", []int{0, 1}, 1},
 	}
 
 	//	开始测试
@@ -30,10 +30,10 @@ 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() {
 }