67 lines
1.4 KiB
C++
67 lines
1.4 KiB
C++
/**
|
|
* File: simple_hash.cpp
|
|
* Created Time: 2023-06-21
|
|
* Author: krahets (krahets@163.com)
|
|
*/
|
|
|
|
#include "../utils/common.hpp"
|
|
|
|
/* 加法哈希 */
|
|
int addHash(string key) {
|
|
long long hash = 0;
|
|
const int MODULUS = 1000000007;
|
|
for (unsigned char c : key) {
|
|
hash = (hash + (int)c) % MODULUS;
|
|
}
|
|
return (int)hash;
|
|
}
|
|
|
|
/* 乘法哈希 */
|
|
int mulHash(string key) {
|
|
long long hash = 0;
|
|
const int MODULUS = 1000000007;
|
|
for (unsigned char c : key) {
|
|
hash = (31 * hash + (int)c) % MODULUS;
|
|
}
|
|
return (int)hash;
|
|
}
|
|
|
|
/* 异或哈希 */
|
|
int xorHash(string key) {
|
|
int hash = 0;
|
|
const int MODULUS = 1000000007;
|
|
for (unsigned char c : key) {
|
|
hash ^= (int)c;
|
|
}
|
|
return hash & MODULUS;
|
|
}
|
|
|
|
/* 旋转哈希 */
|
|
int rotHash(string key) {
|
|
long long hash = 0;
|
|
const int MODULUS = 1000000007;
|
|
for (unsigned char c : key) {
|
|
hash = ((hash << 4) ^ (hash >> 28) ^ (int)c) % MODULUS;
|
|
}
|
|
return (int)hash;
|
|
}
|
|
|
|
/* Driver Code */
|
|
int main() {
|
|
string key = "Hello dsad3241241dsa算123法";
|
|
|
|
int hash = addHash(key);
|
|
cout << "加法哈希值为 " << hash << endl;
|
|
|
|
hash = mulHash(key);
|
|
cout << "乘法哈希值为 " << hash << endl;
|
|
|
|
hash = xorHash(key);
|
|
cout << "异或哈希值为 " << hash << endl;
|
|
|
|
hash = rotHash(key);
|
|
cout << "旋转哈希值为 " << hash << endl;
|
|
|
|
return 0;
|
|
}
|