111 lines
2.7 KiB
Swift
111 lines
2.7 KiB
Swift
/**
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* File: array_hash_map.swift
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* Created Time: 2023-01-16
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* Author: nuomi1 (nuomi1@qq.com)
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*/
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import utils
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/* Hash table based on array implementation */
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class ArrayHashMap {
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private var buckets: [Pair?]
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init() {
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// Initialize an array, containing 100 buckets
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buckets = Array(repeating: nil, count: 100)
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}
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/* Hash function */
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private func hashFunc(key: Int) -> Int {
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let index = key % 100
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return index
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}
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/* Query operation */
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func get(key: Int) -> String? {
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let index = hashFunc(key: key)
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let pair = buckets[index]
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return pair?.val
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}
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/* Add operation */
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func put(key: Int, val: String) {
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let pair = Pair(key: key, val: val)
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let index = hashFunc(key: key)
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buckets[index] = pair
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}
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/* Remove operation */
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func remove(key: Int) {
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let index = hashFunc(key: key)
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// Set to nil, representing removal
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buckets[index] = nil
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}
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/* Get all key-value pairs */
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func pairSet() -> [Pair] {
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buckets.compactMap { $0 }
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}
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/* Get all keys */
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func keySet() -> [Int] {
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buckets.compactMap { $0?.key }
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}
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/* Get all values */
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func valueSet() -> [String] {
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buckets.compactMap { $0?.val }
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}
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/* Print hash table */
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func print() {
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for pair in pairSet() {
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Swift.print("\(pair.key) -> \(pair.val)")
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}
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}
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}
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@main
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enum _ArrayHashMap {
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/* Driver Code */
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static func main() {
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/* Initialize hash table */
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let map = ArrayHashMap()
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/* Add operation */
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// Add key-value pair (key, value) to the hash table
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map.put(key: 12836, val: "Ha")
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map.put(key: 15937, val: "Luo")
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map.put(key: 16750, val: "Suan")
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map.put(key: 13276, val: "Fa")
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map.put(key: 10583, val: "Ya")
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print("\nAfter adding, the hash table is\nKey -> Value")
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map.print()
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/* Query operation */
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// Enter key to the hash table, get value
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let name = map.get(key: 15937)!
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print("\nInput student ID 15937, found name \(name)")
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/* Remove operation */
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// Remove key-value pair (key, value) from the hash table
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map.remove(key: 10583)
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print("\nAfter removing 10583, the hash table is\nKey -> Value")
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map.print()
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/* Traverse hash table */
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print("\nTraverse key-value pairs Key->Value")
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for pair in map.pairSet() {
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print("\(pair.key) -> \(pair.val)")
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}
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print("\nIndividually traverse keys Key")
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for key in map.keySet() {
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print(key)
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}
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print("\nIndividually traverse values Value")
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for val in map.valueSet() {
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print(val)
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}
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}
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}
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