Solution.java

class Solution {
    public long makeSimilar(int[] nums, int[] target) {
        Arrays.sort(nums);
        Arrays.sort(target);
        List<Integer> a1 = new ArrayList<>();
        List<Integer> a2 = new ArrayList<>();
        List<Integer> b1 = new ArrayList<>();
        List<Integer> b2 = new ArrayList<>();
        for (int v : nums) {
            if (v % 2 == 0) {
                a1.add(v);
            } else {
                a2.add(v);
            }
        }
        for (int v : target) {
            if (v % 2 == 0) {
                b1.add(v);
            } else {
                b2.add(v);
            }
        }
        long ans = 0;
        for (int i = 0; i < a1.size(); ++i) {
            ans += Math.abs(a1.get(i) - b1.get(i));
        }
        for (int i = 0; i < a2.size(); ++i) {
            ans += Math.abs(a2.get(i) - b2.get(i));
        }
        return ans / 4;
    }
}