38 lines
841 B
C++
38 lines
841 B
C++
// basic approach: use two loops to generate the first half and the second half
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/*
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class Solution {
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public:
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vector<int> getConcatenation(vector<int>& nums) {
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// use the default constructor
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vector<int> ans;
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int size = nums.size();
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for(int i=0;i<size;i++){
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ans.push_back(nums[i]);
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}
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// do it one more time
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for(int i=0;i<size;i++){
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ans.push_back(nums[i]);
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}
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return ans;
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}
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};
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*/
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// approach 2: use the copy constructor
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class Solution {
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public:
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vector<int> getConcatenation(vector<int>& nums) {
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// use the copy constructor
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vector<int> ans(nums);
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int size = nums.size();
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// copy the second half
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for(int i=0;i<size;i++){
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ans.push_back(nums[i]);
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}
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return ans;
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}
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};
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