// you can also use includes, for example:

// #include <algorithm>

int get_height(tree * T) {

    if (T->l == NULL && T->r == NULL)

        return 0;

    int hl = 0;

    int hr = 0;

    if (T->l != NULL)

        hl = get_height(T->l);

    if (T->r != NULL)

        hr = get_height(T->r);

    return max(hl, hr) + 1;

}

int solution(tree * T) {

    // write your code in C++98

    return get_height(T);

}