1470. Shuffle the Array (inplace)

class Solution {
public:
    vector<int> shuffle(vector<int>& nums, int n) {
        int i=0, j=n, max=10000;
        for(int m=0; m<2*n; m++){
            if(m%2==0) nums[m]= (nums[i++]%max)*max + nums[m];
            else nums[m]= (nums[j++]%max)*max + nums[m];
        }
        for(int i=0; i<2*n;i++){
            nums[i]/=max;
        }
        return nums;
    }
};