static int[] isPowerOf2(int[] nums) {
        int[] poweroftwo = new int[nums.length];
    for(int i = 0; i<nums.length; i++){
        if(nums[i]!=0 && (nums[i]&(nums[i]-1)) == 0)
            poweroftwo[i]=1;
        else poweroftwo[i] = 0;
    }
        return poweroftwo;
    }