Swiftでミュータブルな要素を使わず、配列からDictionaryに変換する。(Swift)

main.swift

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// Your code here!
 
 
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keyStrSet
[3: "3", 1: "1", 2: "2", 4: "4"]
keyValueSwapLast
["b": 2, "a": 4, "c": 3]
keyValueSwapFirst
["b": 2, "a": 1, "c": 3]

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