Add C++ solution of problem #2206

Author: Cuda-Chen

2206/solution.cpp

@@ -0,0 +1,18 @@
+class Solution {
+public:
+    bool divideArray(vector<int>& A) {
+        int n = A.size();
+        if(n & 1)
+            return false;
+
+        unordered_map<int, int> m;
+        for(int a : A) {
+            m[a]++;
+        }
+        for(auto [_, v] : m) {
+            if(v & 1)
+                return false;
+        }
+        return true;
+    }
+};