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class Solution {
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 public:
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  std::vector<int> sortArrayByParity(std::vector<int> &nums) {
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    std::vector<int> result;
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    for (int i : nums) {
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      if (i % 2 == 0) {
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        result.push_back(i);
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      }
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    }
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    for (int j : nums) {
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      if (j % 2 != 0) {
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        result.push_back(j);
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      }
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    }
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    return result;
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  }
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};