C++ USING STL INSERT FUNCTION || NO LOOP || 1 LINER
\nclass Solution {\npublic:\n    vector<int> getConcatenation(vector<int>& nums) {\n        nums.insert(nums.end(),nums.begin(),nums.end());\n        return num
```\nclass Solution {\npublic:\n    vector<int> getConcatenation(vector<int>& nums) {\n        nums.insert(nums.end(),nums.begin(),nums.end());\n        return nums;\n    }\n};\n```
['Array', 'C']