April 2018
Intermediate to advanced
224 pages
7h
English
Content preview from Classic Computer Science Problems in SwiftBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 1. Small problems
To get started, we will explore some simple problems that can be solved with no more than a few relatively short functions. Although these problems are small, they will still allow us to explore some interesting problem-solving techniques. Think of them as a good warmup.
1.1. The Fibonacci sequence
The Fibonacci sequence is a series of numbers such that any number, except for the first and second, is the sum of the previous two:
0, 1, 1, 2, 3, 5, 8, 13, 21...
The value of the first Fibonacci number in the series is 0. The value of the fourth Fibonacci number is 2. It follows that to get the value of any Fibonacci number, n, in the series, one can use the formula
fib(n) = fib(n - 1) + fib(n - 2)
1.1.1. A first recursive ...
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