ds/hashTable.cpp

• View this file on GitHub
• Last update: 2024-11-19 21:59:27+08:00
• Link: https://codeforces.com/blog/entry/62393

Verified with

• test/associative_array.test.cpp
• test/vertex_add_range_contour_sum_on_tree.test.cpp
• test/vertex_get_range_contour_add_on_tree.test.cpp

Code

//source: https://codeforces.com/blog/entry/62393
//#include<ext/pb_ds/assoc_container.hpp>
//#include<ext/pb_ds/tree_policy.hpp>

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

using namespace __gnu_pbds;

//gp_hash_table<ll, int, custom_hash> m({}, {}, {}, {}, {1 << 16});

#line 1 "ds/hashTable.cpp"
//source: https://codeforces.com/blog/entry/62393
//#include<ext/pb_ds/assoc_container.hpp>
//#include<ext/pb_ds/tree_policy.hpp>

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

using namespace __gnu_pbds;

//gp_hash_table<ll, int, custom_hash> m({}, {}, {}, {}, {1 << 16});

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