mirror of
https://github.com/krahets/hello-algo.git
synced 2026-02-04 03:14:09 +08:00
954c45864b
* docs: add Japanese documents (`ja/docs`) * docs: add Japanese documents (`ja/codes`) * docs: add Japanese documents * Remove pythontutor blocks in ja/ * Add an empty at the end of each markdown file. * Add the missing figures (use the English version temporarily). * Add index.md for Japanese version. * Add index.html for Japanese version. * Add missing index.assets * Fix backtracking_algorithm.md for Japanese version. * Add avatar_eltociear.jpg. Fix image links on the Japanese landing page. * Add the Japanese banner. --------- Co-authored-by: krahets <krahets@163.com>
65 lines
1.7 KiB
Java
65 lines
1.7 KiB
Java
/**
|
|
* File: simple_hash.java
|
|
* Created Time: 2023-06-21
|
|
* Author: krahets (krahets@163.com)
|
|
*/
|
|
|
|
package chapter_hashing;
|
|
|
|
public class simple_hash {
|
|
/* 加算ハッシュ */
|
|
static int addHash(String key) {
|
|
long hash = 0;
|
|
final int MODULUS = 1000000007;
|
|
for (char c : key.toCharArray()) {
|
|
hash = (hash + (int) c) % MODULUS;
|
|
}
|
|
return (int) hash;
|
|
}
|
|
|
|
/* 乗算ハッシュ */
|
|
static int mulHash(String key) {
|
|
long hash = 0;
|
|
final int MODULUS = 1000000007;
|
|
for (char c : key.toCharArray()) {
|
|
hash = (31 * hash + (int) c) % MODULUS;
|
|
}
|
|
return (int) hash;
|
|
}
|
|
|
|
/* XORハッシュ */
|
|
static int xorHash(String key) {
|
|
int hash = 0;
|
|
final int MODULUS = 1000000007;
|
|
for (char c : key.toCharArray()) {
|
|
hash ^= (int) c;
|
|
}
|
|
return hash & MODULUS;
|
|
}
|
|
|
|
/* 回転ハッシュ */
|
|
static int rotHash(String key) {
|
|
long hash = 0;
|
|
final int MODULUS = 1000000007;
|
|
for (char c : key.toCharArray()) {
|
|
hash = ((hash << 4) ^ (hash >> 28) ^ (int) c) % MODULUS;
|
|
}
|
|
return (int) hash;
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
String key = "Hello algorithm";
|
|
|
|
int hash = addHash(key);
|
|
System.out.println("加算ハッシュ値は " + hash + " です");
|
|
|
|
hash = mulHash(key);
|
|
System.out.println("乗算ハッシュ値は " + hash + " です");
|
|
|
|
hash = xorHash(key);
|
|
System.out.println("XORハッシュ値は " + hash + " です");
|
|
|
|
hash = rotHash(key);
|
|
System.out.println("回転ハッシュ値は " + hash + " です");
|
|
}
|
|
} |