Build Array from Permutation LeetCode solution in C++

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class Solution {
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 public:
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  vector<int> buildArray(vector<int> &nums) {
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    int n = nums.size();
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    vector<int> ans(n);
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    for (int i = 0; i < n; i++) {
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      ans[i] = nums[nums[i]];
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    }
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    return ans;
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  }
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};