Add C++ solution of problem #2425

Author: Cuda-Chen

2425/solution.cpp

@@ -0,0 +1,18 @@
+// If the size of nums1 is m and the size of nums2 is n, then each number in
+// nums1 is repeated n times and each number in nums2 is repeated m times.
+
+class Solution {
+public:
+    int xorAllNums(vector<int>& A, vector<int>& B) {
+        int ans = 0;
+        if(A.size() % 2 == 1) {
+            for(int b : B)
+                ans ^= b;
+        }
+        if(B.size() % 2 == 1) {
+            for(int a : A)
+                ans ^= a;
+        }
+        return ans;
+    }
+};