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DataStructure/Hashmap.hpp

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Last update: 2024-06-22 22:54:12+09:00
Include: #include "DataStructure/Hashmap.hpp"
Link: http://xorshift.di.unimi.it/splitmix64.c
Link: https://codeforces.com/blog/entry/62393?locale=en

Verified with

Verify/verify-yosupo-datastructure/associative_array.test.cpp

Code

#pragma once
#include <ext/pb_ds/assoc_container.hpp>
#include <chrono>

// https://codeforces.com/blog/entry/62393?locale=en
struct custom_hash {
    // http://xorshift.di.unimi.it/splitmix64.c
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }
    uint64_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = std::chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};
template <typename Key, typename Val>
using Hashmap = __gnu_pbds::gp_hash_table<Key, Val, custom_hash>;

#line 2 "DataStructure/Hashmap.hpp"
#include <ext/pb_ds/assoc_container.hpp>
#include <chrono>

// https://codeforces.com/blog/entry/62393?locale=en
struct custom_hash {
    // http://xorshift.di.unimi.it/splitmix64.c
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }
    uint64_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = std::chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};
template <typename Key, typename Val>
using Hashmap = __gnu_pbds::gp_hash_table<Key, Val, custom_hash>;