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Student Database

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示例

输入
students = {}
solve(students, "Peter")
solve(students, "Eliza")
add_course(students, "Peter", ("Data Structures and Algorithms", 1))
add_course(students, "Peter", ("Introduction to Programming", 1))
add_course(students, "Peter", ("Advanced Course in Programming", 1))
add_course(students, "Eliza", ("Introduction to Programming", 5))
add_course(students, "Eliza", ("Introduction to Computer Science", 4))
summary(students)
期望输出
students 2
most courses completed 3 Peter
best average grade 4.5 Eliza
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