Add solution and test-cases for problem 1262

Author: 0xff-dev

leetcode/1201-1300/1262.Greatest-Sum-Divisible-by-Three/README.md

@@ -1,28 +1,31 @@
 # [1262.Greatest Sum Divisible by Three][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 integer array `nums`, return the **maximum possible sum** of elements of the array such that it is divisible by three.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [3,6,5,1,8]
+Output: 18
+Explanation: Pick numbers 3, 6, 1 and 8 their sum is 18 (maximum sum divisible by 3).
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Greatest Sum Divisible by Three
-```go
+```
+Input: nums = [4]
+Output: 0
+Explanation: Since 4 is not divisible by 3, do not pick any number.
 ```
 
+**Example 3:**
+
+```
+Input: nums = [1,2,3,4,4]
+Output: 12
+Explanation: Pick numbers 1, 3, 4 and 4 their sum is 12 (maximum sum divisible by 3).
+```
 
 ## 结语
 

leetcode/1201-1300/1262.Greatest-Sum-Divisible-by-Three/Solution.go

@@ -1,5 +1,20 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int) int {
+	dp := []int{-1, -1, -1}
+	dp[0] = 0
+
+	for _, num := range nums {
+		t := make([]int, 3)
+		copy(t, dp)
+		for _, i := range t {
+			if i >= 0 {
+				newR := (i + num) % 3
+				if i+num > dp[newR] {
+					dp[newR] = i + num
+				}
+			}
+		}
+	}
+	return dp[0]
 }

leetcode/1201-1300/1262.Greatest-Sum-Divisible-by-Three/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{3, 6, 5, 1, 8}, 18},
+		{"TestCase2", []int{4}, 0},
+		{"TestCase3", []int{1, 2, 3, 4, 4}, 12},
 	}
 
 	//	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() {
 }