Decompress Run-Length Encoded List LeetCode solution in C++

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class Solution {
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 public:
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  vector<int> decompressRLElist(vector<int> &nums) {
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    vector<int> ans;
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    for (int i = 0; i < nums.size(); i += 2) {
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      int freq = nums[i];
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      int val = nums[i + 1];
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      while (freq--) {
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        ans.push_back(val);
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      }
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    }
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    return ans;
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  }
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};