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Add ru version (#1865)
* Add Russian docs site baseline * Add Russian localized codebase * Polish Russian code wording * Update ru code translation. * Update code translation and chapter covers. * Fix pythontutor extraction. * Add README and landing page. * placeholder of profiles * Use figures of English version * Remove chapter paperbook
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65
ru/codes/java/chapter_hashing/simple_hash.java
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65
ru/codes/java/chapter_hashing/simple_hash.java
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/**
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* File: simple_hash.java
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* Created Time: 2023-06-21
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* Author: krahets (krahets@163.com)
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*/
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package chapter_hashing;
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public class simple_hash {
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/* Аддитивное хеширование */
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static int addHash(String key) {
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long hash = 0;
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final int MODULUS = 1000000007;
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for (char c : key.toCharArray()) {
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hash = (hash + (int) c) % MODULUS;
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}
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return (int) hash;
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}
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/* Мультипликативное хеширование */
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static int mulHash(String key) {
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long hash = 0;
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final int MODULUS = 1000000007;
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for (char c : key.toCharArray()) {
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hash = (31 * hash + (int) c) % MODULUS;
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}
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return (int) hash;
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}
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/* XOR-хеширование */
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static int xorHash(String key) {
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int hash = 0;
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final int MODULUS = 1000000007;
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for (char c : key.toCharArray()) {
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hash ^= (int) c;
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}
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return hash & MODULUS;
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}
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/* Хеширование с циклическим сдвигом */
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static int rotHash(String key) {
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long hash = 0;
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final int MODULUS = 1000000007;
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for (char c : key.toCharArray()) {
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hash = ((hash << 4) ^ (hash >> 28) ^ (int) c) % MODULUS;
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}
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return (int) hash;
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}
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public static void main(String[] args) {
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String key = "Hello Algo";
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int hash = addHash(key);
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System.out.println("Хеш-сумма сложением = " + hash);
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hash = mulHash(key);
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System.out.println("Хеш-сумма умножением = " + hash);
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hash = xorHash(key);
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System.out.println("Хеш-сумма XOR = " + hash);
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hash = rotHash(key);
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System.out.println("Хеш-сумма с циклическим сдвигом = " + hash);
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}
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}
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