Merge pull request #925 from 0xff-dev/1679

Add solution and test-cases for problem 1679

Author: 6boris

leetcode/1601-1700/1679.Max-Number-of-K-Sum-Pairs/README.md

@@ -1,28 +1,32 @@
 # [1679.Max Number of K-Sum Pairs][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 integer array `nums` and an integer `k`.
+
+In one operation, you can pick two numbers from the array whose sum equals `k` and remove them from the array.
+
+Return the maximum number of operations you can perform on the array.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [1,2,3,4], k = 5
+Output: 2
+Explanation: Starting with nums = [1,2,3,4]:
+- Remove numbers 1 and 4, then nums = [2,3]
+- Remove numbers 2 and 3, then nums = []
+There are no more pairs that sum up to 5, hence a total of 2 operations.
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
-
-### 思路1
-> ...
-Max Number of K-Sum Pairs
-```go
 ```
-
+Input: nums = [3,1,3,4,3], k = 6
+Output: 1
+Explanation: Starting with nums = [3,1,3,4,3]:
+- Remove the first two 3's, then nums = [1,4,3]
+There are no more pairs that sum up to 6, hence a total of 1 operation.
+```
 
 ## 结语
 

leetcode/1601-1700/1679.Max-Number-of-K-Sum-Pairs/Solution.go

@@ -1,5 +1,23 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+import "sort"
+
+func Solution(nums []int, k int) int {
+	sort.Ints(nums)
+	s, e := 0, len(nums)-1
+	ans := 0
+	for s < e {
+		sum := nums[s] + nums[e]
+		if sum == k {
+			ans++
+			s, e = s+1, e-1
+			continue
+		}
+		if sum < k {
+			s++
+		} else {
+			e--
+		}
+	}
+	return ans
 }

leetcode/1601-1700/1679.Max-Number-of-K-Sum-Pairs/Solution_test.go

@@ -10,30 +10,30 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		inputs []int
+		k      int
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{1, 2, 3, 4}, 5, 2},
+		{"TestCase2", []int{3, 1, 3, 4, 3}, 6, 1},
 	}
 
 	//	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.inputs, c.k)
 			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.inputs, c.k)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }