Merge pull request #1387 from 0xff-dev/3432

Add solution and test-cases for problem 3432

Author: 6boris

leetcode/3401-3500/3432.Count-Partitions-with-Even-Sum-Difference/README.md

@@ -1,28 +1,55 @@
 # [3432.Count Partitions with Even Sum Difference][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` of length `n`.
+
+A **partition** is defined as an index `i` where `0 <= i < n - 1`, splitting the array into two **non-empty** subarrays such that:
+
+- Left subarray contains indices `[0, i]`.
+- Right subarray contains indices `[i + 1, n - 1]`.
+
+Return the number of **partitions** where the **difference** between the **sum** of the left and right subarrays is **even**.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [10,10,3,7,6]
+
+Output: 4
+
+Explanation:
+
+The 4 partitions are:
+
+[10], [10, 3, 7, 6] with a sum difference of 10 - 26 = -16, which is even.
+[10, 10], [3, 7, 6] with a sum difference of 20 - 16 = 4, which is even.
+[10, 10, 3], [7, 6] with a sum difference of 23 - 13 = 10, which is even.
+[10, 10, 3, 7], [6] with a sum difference of 30 - 6 = 24, which is even.
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
+```
+Input: nums = [1,2,2]
+
+Output: 0
+
+Explanation:
+
+No partition results in an even sum difference.
+```
+
+**Example 3:**
 
-### 思路1
-> ...
-Count Partitions with Even Sum Difference
-```go
 ```
+Input: nums = [2,4,6,8]
+
+Output: 3
 
+Explanation:
+
+All partitions result in an even sum difference.
+```
 
 ## 结语
 

leetcode/3401-3500/3432.Count-Partitions-with-Even-Sum-Difference/Solution.go

@@ -1,5 +1,16 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int) int {
+	var ret, diff int
+	l := len(nums)
+	for i := 1; i < l; i++ {
+		nums[i] += nums[i-1]
+	}
+	// 1, 2, 3, 4
+	for i := 0; i < l-1; i++ {
+		if diff = nums[l-1] - nums[i] - nums[i]; diff&1 == 0 {
+			ret++
+		}
+	}
+	return ret
 }

leetcode/3401-3500/3432.Count-Partitions-with-Even-Sum-Difference/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{10, 10, 3, 7, 6}, 4},
+		{"TestCase2", []int{1, 2, 2}, 0},
+		{"TestCase3", []int{2, 4, 6, 8}, 3},
 	}
 
 	//	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() {
 }