created solution for problem68

Author: dampdigits

problem68/Solution.java

@@ -0,0 +1,10 @@
+class Solution {
+    public int singleNumber(int[] nums) {
+        int ans = nums[0];
+
+        for (int i = 1; i < nums.length; i++)
+            ans ^= nums[i];
+
+        return ans;
+    }
+}