Add solution and test-cases for problem 1975

Author: 0xff-dev

leetcode/1901-2000/1975.Maximum-Matrix-Sum/1.png

@@ -1,28 +1,36 @@
 # [1975.Maximum Matrix Sum][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 `n x n` integer `matrix`. You can do the following operation **any** number of times:
+
+- Choose any two **adjacent** elements of `matrix` and **multiply** each of them by ``-1`.
+
+Two elements are considered **adjacent** if and only if they share a **border**.
+
+Your goal is to **maximum** the summation of the matrix's elements. Return the **maximum** sum of the matrix's elements using the operation mentioned above.
 
-**Example 1:**
+**Example 1:**  
+
+![1](./1.png)
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: matrix = [[1,-1],[-1,1]]
+Output: 4
+Explanation: We can follow the following steps to reach sum equals 4:
+- Multiply the 2 elements in the first row by -1.
+- Multiply the 2 elements in the first column by -1.
 ```
 
-## 题意
-> ...
+**Example 2:**  
 
-## 题解
+![2](./2.png)
 
-### 思路1
-> ...
-Maximum Matrix Sum
-```go
 ```
-
+Input: matrix = [[1,2,3],[-1,-2,-3],[1,2,3]]
+Output: 16
+Explanation: We can follow the following step to reach sum equals 16:
+- Multiply the 2 last elements in the second row by -1.
+```
 
 ## 结语
 

leetcode/1901-2000/1975.Maximum-Matrix-Sum/2.png

@@ -1,5 +1,26 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(matrix [][]int) int64 {
+	ans, neg := int64(0), 0
+	_min := int64(100001)
+	zero := 0
+	rows, cols := len(matrix), len(matrix[0])
+	for i := range rows {
+		for j := range cols {
+			cur := int64(matrix[i][j])
+			if cur == 0 {
+				zero++
+			}
+			if cur < 0 {
+				neg++
+				cur = -cur
+			}
+			ans += cur
+			_min = min(_min, cur)
+		}
+	}
+	if neg&1 == 1 && zero == 0 {
+		ans -= 2 * _min
+	}
+	return ans
 }

leetcode/1901-2000/1975.Maximum-Matrix-Sum/README.md

@@ -10,12 +10,11 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		inputs [][]int
+		expect int64
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", [][]int{{1, -1}, {-1, 1}}, 4},
+		{"TestCase2", [][]int{{1, 2, 3}, {-1, 2, 3}, {1, 2, 3}}, 16},
 	}
 
 	//	开始测试
@@ -30,10 +29,10 @@ 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() {
 }