feat(makeTheIntegerZeio): add C# solution

problems/2749-minimum-operations-to-make-the-integer-zero/csharp/Program.cs

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+// LeetCode 2749: Minimum Operations To Make The Integer Zero
+// 難度: Medium
+// 日期: 2025-09-05
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+public class Solution
+{
+    public int MakeTheIntegerZero(int num1, int num2)
+    {
+        for (int k = 1; k <= 60; k++)
+        {
+            long target = (long)num1 - (long)k * num2;
+
+            if (target < 0) continue;
+
+            int bitCount = CountSetBits(target);
+
+            if (bitCount <= k && k <= target)
+            {
+                return k;
+            }
+        }
+
+        return -1;
+    }
+
+    private int CountSetBits(long n)
+    {
+        int count = 0;
+        while (n > 0)
+        {
+            // 方法一
+            // count += (int)(n & 1);
+            // n >>= 1;
+
+            // 方法二
+            count++;
+            n &= n - 1;
+        }
+        return count;
+    }
+}
+
+public class Program
+{
+    public static void Main()
+    {
+        Solution solution = new Solution();
+        TestCase1(solution);
+        TestCase2(solution);
+    }
+
+    static void TestCase1(Solution solution)
+    {
+        int num1 = 3, num2 = -2;
+        int expected = 3;
+        int actual = solution.MakeTheIntegerZero(num1, num2);
+
+        Console.WriteLine("Test 1:");
+        Console.WriteLine($"Input: num1 = {num1}, num2 = {num2}");
+        Console.WriteLine($"Expected: {expected}");
+        Console.WriteLine($"Actual: {actual}");
+        Console.WriteLine($"Result: {(actual == expected ? "PASS" : "FAIL")}");
+        Console.WriteLine();
+    }
+
+    static void TestCase2(Solution solution) 
+    {
+        int num1 = 5, num2 = 7;
+        int expected = -1;
+        int actual = solution.MakeTheIntegerZero(num1, num2);
+        
+        Console.WriteLine("Test 2:");
+        Console.WriteLine($"Input: num1 = {num1}, num2 = {num2}");
+        Console.WriteLine($"Expected: {expected}");
+        Console.WriteLine($"Actual: {actual}");
+        Console.WriteLine($"Result: {(actual == expected ? "PASS" : "FAIL")}");
+        Console.WriteLine();
+    }
+
+}

problems/2749-minimum-operations-to-make-the-integer-zero/csharp/csharp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>