public void recur(int level, int param) {   
    // terminator
    if (level > MAX_LEVEL) {
        // process result 
        return;
    }  
    // process current logic
    process(level, param);
    // drill down
    recur( level: level + 1, newParam);
    // restore current status
}

private static int divide_conquer(Problem problem, ) {
    if (problem == NULL) {
        int res = process_last_result();
        return res;
    }  
    subProblems = split_problem(problem);
    res0 = divide_conquer(subProblems[0]);
    res1 = divide_conquer(subProblems[1]);
    // res...
    result = process_result(res0, res1, ...);
    return result;
}