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74 lines
1.5 KiB
74 lines
1.5 KiB
/**
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* File: simple_hash.swift
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* Created Time: 2023-07-01
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* Author: nuomi1 (nuomi1@qq.com)
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*/
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/* 加法哈希 */
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func addHash(key: String) -> Int {
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var hash = 0
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let MODULUS = 1_000_000_007
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for c in key {
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for scalar in c.unicodeScalars {
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hash = (hash + Int(scalar.value)) % MODULUS
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}
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}
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return hash
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}
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/* 乘法哈希 */
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func mulHash(key: String) -> Int {
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var hash = 0
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let MODULUS = 1_000_000_007
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for c in key {
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for scalar in c.unicodeScalars {
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hash = (31 * hash + Int(scalar.value)) % MODULUS
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}
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}
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return hash
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}
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/* 异或哈希 */
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func xorHash(key: String) -> Int {
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var hash = 0
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let MODULUS = 1_000_000_007
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for c in key {
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for scalar in c.unicodeScalars {
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hash ^= Int(scalar.value)
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}
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}
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return hash & MODULUS
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}
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/* 旋转哈希 */
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func rotHash(key: String) -> Int {
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var hash = 0
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let MODULUS = 1_000_000_007
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for c in key {
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for scalar in c.unicodeScalars {
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hash = ((hash << 4) ^ (hash >> 28) ^ Int(scalar.value)) % MODULUS
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}
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}
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return hash
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}
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@main
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enum SimpleHash {
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/* Driver Code */
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static func main() {
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let key = "Hello 算法"
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var hash = addHash(key: key)
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print("加法哈希值为 \(hash)")
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hash = mulHash(key: key)
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print("乘法哈希值为 \(hash)")
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hash = xorHash(key: key)
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print("异或哈希值为 \(hash)")
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hash = rotHash(key: key)
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print("旋转哈希值为 \(hash)")
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}
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}
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