Prefixes For a list L, the prefix of L of length n is the first n items of L. For example, the prefix of length 3 of the list [1,4,2,8,5,7] is the list [1,4,2]. A list of length n therefore has a total of n+1 prefixes (lengths 0,1,2,3,..., n). Write a function allPrefixes (L:List[int]) -> List[List[int]] that takes in a list and returns a list containing all prefixes of L. For instance, assert allPrefixes ([5,1])== [[], [5], [5,1]] assert allPrefixes ([1,2,3])==[[ ], [1],[1,2], [1,2,3]] assert allPrefixes ([1,2,3,4]) == [[], [1],[1,2],[1,2,3],[1,2,3,4]]

Prefixes For a list L, the prefix of L of length n is the first n items of L. For example, the prefix of length 3 of the list [1,4,2,8,5,7] is the list [1,4,2]. A list of length n therefore has a total of n+1 prefixes (lengths 0,1,2,3,..., n). Write a function allPrefixes (L:List[int]) -> List[List[int]] that takes in a list and returns a list containing all prefixes of L. For instance, assert allPrefixes ([5,1])== [[], [5], [5,1]] assert allPrefixes ([1,2,3])==[[ ], [1],[1,2], [1,2,3]] assert allPrefixes ([1,2,3,4]) == [[], [1],[1,2],[1,2,3],[1,2,3,4]]

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Prefixes
For a list L, the prefix of L of length n is the first n items of L. For example, the prefix of
length 3 of the list [1,4,2, 8,5,7] is the list [1,4,2]. A list of length n therefore has a total of
n+1 prefixes (lengths 0,1,2,3,..., n).
Write a function allPrefixes (L:List[int]) -> List[List[int]] that takes in a list and
returns a list containing all prefixes of L. For instance,
assert allPrefixes ([5,1])== [[], [5], [5,1]]
assert allPrefixes([1,2,3])== [[ ], [1], [1, 2], [1,2,3]]
assert allPrefixes([1,2,3,4])==[[], [1], [1,2],[1,2,3],[1,2,3,4]]

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