public class StepChallenge
{
    /** Returns the number of steps taken on the given day.
     *  Precondition: 1 <= day <= the number of recorded days
     */
    private int getSteps(int day)
    { /* implementation not shown */ }

    /** Returns the first day on which the total number of steps
     *  from day 1 through that day is at least goal, or -1 if the
     *  total never reaches goal by day numDays.
     *  Precondition: numDays >= 1, goal > 0
     */
    public int dayGoalReached(int goal, int numDays)
    { /* to be implemented in part (a) */ }

    /** Returns the number of non-overlapping occurrences of
     *  target in text.
     *  Precondition: target.length() >= 1
     */
    public static int countWord(String text, String target)
    { /* to be implemented in part (b) */ }
}