feat: add Observer Pattern

Studio/Studio/BinarySearch.cpp

@@ -0,0 +1 @@
+#include "BinarySearch.h"

Studio/Studio/BinarySearch.h

@@ -0,0 +1,88 @@
+#pragma once
+#include <iostream>
+#include <vector>
+using namespace std;
+
+int binarySearch(vector<int> vec, int target)
+{
+    int left = 0;
+    int right = vec.size() - 1;
+    
+    while (left <= right) {
+        int mid = left + (right - left) / 2;
+
+        if (target < vec[mid]) {
+            right = mid - 1;
+        } else if (target > vec[mid]) {
+            left = mid + 1;
+        } else {
+            return mid;
+        }
+    }
+
+    return -1;
+}
+
+int binarySearch2(vector<int> vec, int target)
+{
+    int left = 0;
+    int right = vec.size();
+
+    while (left < right) {
+        int mid = left + (right - left) / 2;
+
+        if (target < vec[mid]) {
+            right = mid;
+        } else if (target > vec[mid]) {
+            left = mid + 1;
+        } else {
+            return mid;
+        }
+    }
+
+    return -1;
+}
+
+
+int binarySearch3(vector<int>& vec, int left, int right, int target)
+{
+    if (left > right)         // target 在数组左右两侧时的场景
+        return -1;
+
+    int mid = left + (right - left) / 2;
+    if (target < vec[mid]) {
+        return binarySearch3(vec, left, mid -1, target);
+    } else if (target > vec[mid]) {
+        return binarySearch3(vec, mid + 1, right, target);
+    } else {
+        return mid;
+    }
+}
+
+// 毒药版-错误百出版本
+//int binarySearch4(vector<int> vec, int target)
+//{
+//    int mid = vec.size() / 2;
+//
+//    if (target < vec[mid]) {
+//        vector<int> t(vec.begin(), vec.begin() + mid);
+//        return binarySearch4(t, target);
+//    } else if (target > vec[mid]) {
+//        vector<int> t(vec.begin() + mid + 1, vec.end());
+//        return binarySearch4(t, target);
+//    } else {
+//        return mid;
+//    }
+//    return -1;
+//}
+
+int main()
+{
+    vector<int> v = { 0, 3, 5, 6, 7 };
+    int target = 8;
+    cout << "binarySearch:" << binarySearch(v, target) << endl
+        << "binarySearch2:" << binarySearch2(v, target) << endl
+        << "binarySearch3:" << binarySearch3(v, 0, v.size() - 1,  target) << endl;
+
+    return 0;
+}

Studio/Studio/SpecialMembers.h

@@ -89,22 +89,22 @@ A fn() {
     return t;
 }
 
-int main()
-{
-    A a1("a1");                // default constructor
-    A a2(a1);                  // copy constructor
-    A a3 = a1;                 // copy constructor
-    a1 = a3;                   // copy assignment constructor
-    std::cout << "----------------------------\n\n";
-
-    //fn();                    // function returning a A object
-    A a5 = std::move(a1);      // move constructor
-    A a6;                      // default constructor
-    a6 = std::move(a1);        // move assignment constructor
-    std::cout << "Hello World!\n";
-
-    return 0;
-}
+//int main()
+//{
+//    A a1("a1");                // default constructor
+//    A a2(a1);                  // copy constructor
+//    A a3 = a1;                 // copy constructor
+//    a1 = a3;                   // copy assignment constructor
+//    std::cout << "----------------------------\n\n";
+//
+//    //fn();                    // function returning a A object
+//    A a5 = std::move(a1);      // move constructor
+//    A a6;                      // default constructor
+//    a6 = std::move(a1);        // move assignment constructor
+//    std::cout << "Hello World!\n";
+//
+//    return 0;
+//}
 
 /*************************** 运行结果 *******************************
 * no-default-val constructor

Studio/Studio/Studio.vcxproj

@@ -139,12 +139,14 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClCompile Include="BinarySearch.cpp" />
     <ClCompile Include="SharedPtr.cpp" />
     <ClCompile Include="SpecialMembers.cpp" />
     <ClCompile Include="Studio.cpp" />
     <ClCompile Include="UniquePtr.cpp" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="BinarySearch.h" />
     <ClInclude Include="MemoryAlignment.h" />
     <ClInclude Include="SharedPtr.h" />
     <ClInclude Include="SpecialMembers.h" />

Studio/Studio/Studio.vcxproj.filters

@@ -27,6 +27,9 @@
     <ClCompile Include="SpecialMembers.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="BinarySearch.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="MemoryAlignment.h">
@@ -41,5 +44,8 @@
     <ClInclude Include="SpecialMembers.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="BinarySearch.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>