Device crossover

public class Solution {

    enum VisitType { NONE, WEB, APP }

    public int solve(int[] A, int[] B) {
        int count = 0;
        int i = 0, j = 0;
        VisitType prev = VisitType.NONE;

        while (i < A.length && j < B.length) {
            if (A[i] < B[j]) {
                if (prev == VisitType.APP)
                    count++;
                prev = VisitType.WEB;
                i++;
            } else {
                if (prev == VisitType.WEB)
                    count++;
                prev = VisitType.APP;
                j++;
            }
        }

        if (i < A.length && prev == VisitType.APP ||
            j < B.length && prev == VisitType.WEB)
            count++;

        return count;
    }
}