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View Code? Open in Web Editor NEWSource Code for the Book Classic Computer Science Problems in Swift
License: Apache License 2.0
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Bug in eight queens algorithm?
A direct copy of the algorithm found in https://github.com/davecom/ClassicComputerScienceProblemsInSwift/blob/master/Classic%20Computer%20Science%20Problems%20in%20Swift.playground/Pages/Chapter%203.xcplaygroundpage/Contents.swift can give results that violate the same row constraint (if the format is "column: row"). For example:
"[2: 3, 5: 4, 7: 5, 4: 6, 8: 8, 1: 1, 3: 8, 6: 2]"
8:8 and 3:8 are in the same row, which is a violation. Another example:
"[5: 2, 7: 6, 8: 1, 1: 1, 4: 7, 2: 3, 6: 4, 3: 5]"
8:1 and 1:1 are violating the same row constraint
Missing same column check
Two queens in the same column is also a constraint, so the following line needs to be added to generate a correct result:
if q1c == q2c { return false } // columns same?
could use swift random (swift 4.2)
Line 145 and line 155 could be updated to use Float.random(in: 0 ... 1)
Port to Swift 4
Chapter 2 - Cannot find type 'PriorityQueue' in scope
When executing Chapter 2 on swift playground with xcode, I get the following error message
Cannot find type 'PriorityQueue' in scope
on line (according to chapter 2.2.5 A* search)
var frontier: PriorityQueue<Node<StateType>> = PriorityQueue<Node<StateType>>(ascending: true, startingValues: [Node(state: initialState, parent: nil, cost: 0, heuristic: heuristicFn(initialState))])
Swift 5.7 and Xcode Version 13.4.1 (13F100)
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