Custom Hash Map

struct custom_hash {
    static int splitmix(int x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }
    size_t operator()(int x) const {
        static const int FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix(x + FIXED_RANDOM);
    }
};

unordered_map < int , int , custom_hash > Hash;