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Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | English | Home Page | Category: Computing | 1638 Views, 17304 Search Bots | 159 Words
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Hi, here's your problem today. This problem was recently asked by Google:
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You are given a hash table where the key is a course code, and the value is a list of all the course codes that are prerequisites for the key. Return a valid ordering in which we can complete the courses. If no such ordering exists, return NULL.
Example:
This input should return the order that we need to take these courses:
['CSC100', 'CSC200', 'CSCS300']
Here's your starting point:
Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | English | Home Page | Cateogry: Computing | 1638 Views, 17304 Search Bots | 159 Words By the way, check out our NEW project AlgoPro (http://algopro.com) for over 60+ video coding sessions with ex-Google/ex-Facebook engineers.
You are given a hash table where the key is a course code, and the value is a list of all the course codes that are prerequisites for the key. Return a valid ordering in which we can complete the courses. If no such ordering exists, return NULL.
Example:
{
'CSC300': ['CSC100', 'CSC200'],
'CSC200': ['CSC100'],
'CSC100': []
}
This input should return the order that we need to take these courses:
['CSC100', 'CSC200', 'CSCS300']
Here's your starting point:
def courses_to_take(course_to_prereqs):
# Fill this in.
courses = {
'CSC300': ['CSC100', 'CSC200'],
'CSC200': ['CSC100'],
'CSC100': []
}
print courses_to_take(courses)
# ['CSC100', 'CSC200', 'CSC300']
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