Add solution and test-cases for problem 2429

Author: 0xff-dev

leetcode/2401-2500/2429.Minimize-XOR/README.md

@@ -1,28 +1,36 @@
 # [2429.Minimize XOR][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 two positive integers `num1` and `num2`, find the positive integer `x` such that:
+
+- `x` has the same number of set bits as `num2`, and
+- The value `x XOR num1` is minimal.
+
+Note that `XOR` is the bitwise XOR operation.
+
+Return the integer `x`. The test cases are generated such that `x` is **uniquely determined**.
+
+The number of **set bits** of an integer is the number of `1`'s in its binary representation.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: num1 = 3, num2 = 5
+Output: 3
+Explanation:
+The binary representations of num1 and num2 are 0011 and 0101, respectively.
+The integer 3 has the same number of set bits as num2, and the value 3 XOR 3 = 0 is minimal.
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Minimize XOR
-```go
 ```
-
+Input: num1 = 1, num2 = 12
+Output: 3
+Explanation:
+The binary representations of num1 and num2 are 0001 and 1100, respectively.
+The integer 3 has the same number of set bits as num2, and the value 3 XOR 1 = 2 is minimal.
+```
 
 ## 结语
 

leetcode/2401-2500/2429.Minimize-XOR/Solution.go

@@ -1,5 +1,40 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func countOfOne(x int) int {
+	c := 0
+	for x > 0 {
+		c++
+		x = x & (x - 1)
+	}
+	return c
+}
+
+func Solution(num1 int, num2 int) int {
+	n1, n2 := countOfOne(num1), countOfOne(num2)
+	if n1 == n2 {
+		return num1
+	}
+	if n1 > n2 {
+		diff := n1 - n2
+		mask := 1
+		for i := 0; i < 32 && diff > 0; i++ {
+			if mask&num1 == mask {
+				diff--
+			}
+			mask <<= 1
+		}
+		return num1 & ^(mask - 1)
+	}
+	ans := num1
+	mask := 1
+	diff := n2 - n1
+
+	for i := 0; i < 32 && diff > 0; i++ {
+		if mask&num1 == 0 {
+			ans |= mask
+			diff--
+		}
+		mask <<= 1
+	}
+	return ans
 }

leetcode/2401-2500/2429.Minimize-XOR/Solution_test.go

@@ -10,30 +10,29 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		n1, n2 int
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", 3, 5, 3},
+		{"TestCase2", 1, 12, 3},
 	}
 
 	//	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.n1, c.n2)
 			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.n1, c.n2)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }