class Solution {
public:
    vector<int> exchange(vector<int>& nums) {
        int i=0,j=nums.size()-1;
        while(i<j)
        {
            while(i<j&&nums[i]%2==1) i++;
            while(i<j&&
 
nums[j]%2==0) j--;
            swap(nums[i],nums[j]);
            i++;j--; 
        }
        return nums;
    }
};

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