示例：
​
输入：[3,1,2,4]
输出：[2,4,3,1]
输出 [4,2,3,1]，[2,4,1,3] 和 [4,2,1,3] 也会被接受。
​
​
提示：
​
1 <= A.length <= 5000
0 <= A[i] <= 5000

class Solution {
public:
    vector<int> sortArrayByParity(vector<int>& A) {
        vector<int> res;
        for(auto e: A)
           if(e%2==0) res.push_back(e);
        for(auto e: A)
            if(e%2) res.push_back(e);
        return res;
    }
};