1 files changed, 79 insertions, 0 deletions
diff --git a/works/solutions/cpp/704.cpp b/works/solutions/cpp/704.cpp
new file mode 100644
index 0000000..b56a01a
--- /dev/null
+++ b/works/solutions/cpp/704.cpp
@@ -0,0 +1,79 @@
+#include <vector>
+#include <memory>
+
+class MyHashSet
+{
+    static const int max = 100;
+
+private:
+    std::unique_ptr<std::vector<int>> data_[max];
+
+public:
+    /** Initialize your data structure here. */
+    MyHashSet()
+    {
+    }
+
+    void add(int key)
+    {
+        const auto index = key % max;
+        auto &ptr = data_[index];
+        if (ptr == nullptr)
+        {
+            ptr.reset(new std::vector<int>());
+        }
+
+        auto &v = *ptr;
+        for (auto d : v)
+        {
+            if (d == key)
+                return;
+        }
+
+        v.push_back(key);
+    }
+
+    void remove(int key)
+    {
+        const auto index = key % max;
+        auto &ptr = data_[index];
+        if (ptr == nullptr)
+            return;
+        auto &v = *ptr;
+        const auto end = v.cend();
+        for (auto iter = v.cbegin(); iter != end; ++iter)
+        {
+            if (*iter == key)
+            {
+                v.erase(iter);
+                return;
+            }
+        }
+    }
+
+    /** Returns true if this set contains the specified element */
+    bool contains(int key)
+    {
+        const auto index = key % max;
+        auto &ptr = data_[index];
+        if (ptr == nullptr)
+            return false;
+
+        const auto &v = *ptr;
+        for (auto d : v)
+        {
+            if (d == key)
+                return true;
+        }
+
+        return false;
+    }
+};
+
+/**
+ * Your MyHashSet object will be instantiated and called as such:
+ * MyHashSet* obj = new MyHashSet();
+ * obj->add(key);
+ * obj->remove(key);
+ * bool param_3 = obj->contains(key);
+ */