Solution Exercice 2

public static int supprime(List<Integer> a, List<Integer> b){
    ListIterator<Integer> ita = a.listIterator();
    ListIterator<Integer> itb = b.listIterator();
    int count = 0;
    while(ita.hasNext() && itb.hasNext()){
        int valeurA = ita.next();
        int valeurB = itb.next();
        if(valeurA < valeurB) itb.previous();
        else if(valeurB < valeurA) ita.previous();
        else{
            itb.remove();
            count++;
        }
    }
    return count;
}