Wish karat interview.

他们换成karat了
Course Schedule  /*
You're developing a system for scheduling advising meetings with students in a Computer Science program. Each meeting should be scheduled when a student has completed 50% of their academic program.
Each course at our university has at most one prerequisite that must be taken first. No two courses share a prerequisite. There is only one path through the program.
Write a function that takes a list of (prerequisite, course) pairs, and returns the name of the course that the student will be taking when they are halfway through their program. (If a track has an even number of courses, and therefore has two "middle" courses, you should return the first one.)
Sample input 1: (arbitrarily ordered)
prereqs_courses1 = [
["Foundations of Computer Science", "Operating Systems"],
["Data Structures", "Algorithms"],
["Computer Networks", "Computer Architecture

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"Algorithms", "Foundations of Computer Science"},
        {"Computer Architecture", "Data Structures"},
        {"Software Design", "Computer Networks"}
    };
    String[][] prereqsCourses2 = {
        {"Data Structures", "Algorithms"},
        {"Algorithms", "Foundations of Computer Science"},
        {"Foundations of Computer Science", "Logic"}
    };
    String[][] prereqsCourses3 = {
        {"Data Structures", "Algorithms"}
    };
}

这个是第二题么? 我第一题一次bug free过了, 第二题写完没debug就没时间了, 估计凉了, 正在redo中

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