Add solution and test-cases for problem 1835

leetcode/1801-1900/1835.Find-XOR-Sum-of-All-Pairs-Bitwise-AND/README.md

@@ -1,28 +1,32 @@
 # [1835.Find XOR Sum of All Pairs Bitwise AND][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
+The **XOR sum** of a list is the bitwise `XOR` of all its elements. If the list only contains one element, then its **XOR sum** will be equal to this element.
+
+- For example, the **XOR sum** of `[1,2,3,4]` is equal to `1 XOR 2 XOR 3 XOR 4 = 4`, and the **XOR sum** of `[3]` is equal to `3`.
+
+You are given two **0-indexed** arrays `arr1` and `arr2` that consist only of non-negative integers.
+
+Consider the list containing the result of `arr1[i] AND arr2[j]` (bitwise AND) for every `(i, j)` pair where `0 <= i < arr1.length` and `0 <= j < arr2.length`.
+
+Return the **XOR sum** of the aforementioned list.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: arr1 = [1,2,3], arr2 = [6,5]
+Output: 0
+Explanation: The list = [1 AND 6, 1 AND 5, 2 AND 6, 2 AND 5, 3 AND 6, 3 AND 5] = [0,1,2,0,2,1].
+The XOR sum = 0 XOR 1 XOR 2 XOR 0 XOR 2 XOR 1 = 0.
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Find XOR Sum of All Pairs Bitwise AND
-```go
 ```
-
+Input: arr1 = [12], arr2 = [4]
+Output: 4
+Explanation: The list = [12 AND 4] = [4]. The XOR sum = 4.
+```
 
 ## 结语
 

leetcode/1801-1900/1835.Find-XOR-Sum-of-All-Pairs-Bitwise-AND/Solution.go

@@ -1,5 +1,13 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(arr1 []int, arr2 []int) int {
+	xor2 := 0
+	for _, n := range arr2 {
+		xor2 ^= n
+	}
+	ans := 0
+	for _, n := range arr1 {
+		ans ^= (n & xor2)
+	}
+	return ans
 }

leetcode/1801-1900/1835.Find-XOR-Sum-of-All-Pairs-Bitwise-AND/Solution_test.go

@@ -9,31 +9,30 @@ import (
 func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
-		name   string
-		inputs bool
-		expect bool
+		name       string
+		arr1, arr2 []int
+		expect     int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{1, 2, 3}, []int{6, 5}, 0},
+		{"TestCase2", []int{12}, []int{4}, 4},
 	}
 
 	//	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.arr1, c.arr2)
 			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.arr1, c.arr2)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }