feat: add cpp solution to lc problem: No.706 (doocs#802)

No.0706.Design HashMap/README.md

* Add cpp solution
* Add cpp solution
* Added Solution file

Author: Dhoni77

solution/0700-0799/0706.Design HashMap/README.md

@@ -168,10 +168,37 @@ class MyHashMap {
  */
 ```
 
-### **...**
+### **C++**
 
-```
+```cpp
+class MyHashMap {
+public:
+ int hash[1000010];
+    
+    MyHashMap() {
+        memset(hash, -1, sizeof hash);
+    }
+    
+    void put(int key, int value) {
+        hash[key] = value;
+    }
+    
+    int get(int key) {
+        return hash[key];
+    }
+    
+    void remove(int key) {
+        hash[key] = -1;
+    }
+};
 
+/**
+ * Your MyHashMap object will be instantiated and called as such:
+ * MyHashMap* obj = new MyHashMap();
+ * obj->put(key,value);
+ * int param_2 = obj->get(key);
+ * obj->remove(key);
+ */
 ```
 
 <!-- tabs:end -->

solution/0700-0799/0706.Design HashMap/README_EN.md

@@ -156,10 +156,37 @@ class MyHashMap {
  */
 ```
 
-### **...**
+### **C++**
 
-```
+```cpp
+class MyHashMap {
+public:
+ int hash[1000010];
+    
+    MyHashMap() {
+        memset(hash, -1, sizeof hash);
+    }
+    
+    void put(int key, int value) {
+        hash[key] = value;
+    }
+    
+    int get(int key) {
+        return hash[key];
+    }
+    
+    void remove(int key) {
+        hash[key] = -1;
+    }
+};
 
+/**
+ * Your MyHashMap object will be instantiated and called as such:
+ * MyHashMap* obj = new MyHashMap();
+ * obj->put(key,value);
+ * int param_2 = obj->get(key);
+ * obj->remove(key);
+ */
 ```
 
 <!-- tabs:end -->

solution/0700-0799/0706.Design HashMap/Solution.cpp

@@ -0,0 +1,28 @@
+class MyHashMap {
+public:
+ int hash[1000010];
+    
+    MyHashMap() {
+        memset(hash, -1, sizeof hash);
+    }
+    
+    void put(int key, int value) {
+        hash[key] = value;
+    }
+    
+    int get(int key) {
+        return hash[key];
+    }
+    
+    void remove(int key) {
+        hash[key] = -1;
+    }
+};
+
+/**
+ * Your MyHashMap object will be instantiated and called as such:
+ * MyHashMap* obj = new MyHashMap();
+ * obj->put(key,value);
+ * int param_2 = obj->get(key);
+ * obj->remove(key);
+ */