Data Structures

Hand-Rolled Hash Map

Difficulty

Asked at IMC Trading

Theory: Data Structures You Implement, Not Import

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xxxxx xxxxxxx x++ xxxx xxx xx xxxxx xxx xx-xxxxx xxxx xxx, xxx "xxx xxx xxx::xxxxxxxxx_xxx?" xx x xxxxx xxxxxxxxx xxxxxxxx xx xxxxxxx xxxxxx-xxxxxx xxxxx. xxx xxxxxxxx xxxxxxxxx xx xxxxxxxxx xx x xxxx-xxxxx xxxxxx xxxxx: xxxxx xxxxxx xxxxxxxxx, xxxxx xxxxxx xxxxxx x xxxxxxx xx x xxxxxxxxxx xxxxxxxxx xxxx, xxx xxxxxxxxx xxxxx x xxxxxx xxxx xxxxxxx xxxx xxxxxx. xx xxxx-xxxxxxxxxx xxxxx xxxx xxxx xxxxxx xxxx xxxx xx xxxx. xxxxx xxx.

xxxxxxxxx xxxxxxxxxxx xxx xxxx xxxx xxxx xxx xxxxxx:

xxxxxxxxxxx(): xxxxx xxx.
xxxx xxxxxx(xxxx xxxx xxx, xxxx xxxx xxxxx): xxxxxxx, xx xxxxxxxxxx xxx xxxxx xx xxx xxx xxxxxx. xxxxxxx xxxx xx xxx xxx xxx xxx.
xxxx xxxxx(xxxx xxxx xxx): xxxxxxx xxx xxx. xxxxxxx xxxxxxx xx xxxxxxx.
xxx::xxxxxxxx<xxxx xxxx> xxxx(xxxx xxxx xxx) xxxxx: xxx xxxxx, xx xxx::xxxxxxx.
xxx::xxxx_x xxxx() xxxxx: xxxxxx xx xxxx xxxx.

xxxxxxxx xxxxxx (xxxx xx xxx xxxxxxxx, xxx xxx xxxxxx xxxxx xxx xxxxx xx xxxxx xxxxxxxxx):

xxxx xxxxxxxxxx xxxx xxxxxx xxxxxxx xxxx xxxx xxxxxx; xxxxxxxx x xxxxx xx xxx. xxx xxxxxx xx-xxx xxxxx xxx xxx xxxx (xxxxxxxxxx xx xxx xxxxxxxx xxxxxx; xxxxxxxx xxxxxxx xxxx xxx xx xxxxxxxx, xxx xxxxx x xxxxxx-xx).
xxxxxxxxxx xx xxxxx. xxxxxxx xxx xxxx xxxxx xxxxx xxxxx xxxxx xxxxx xxxxx xxxx xxxxxx xxxxxxx xx; xxxxxxx xx xxxx xxxxx xxxxxxx xxxxxxx xxxxx xxxxxxx xxxxxxx xxxxx xxx xxxx.
xxxxxx xx xxxx xxxxxx x.x, xxxxxxxx xxxxxxxx xxxx xxxxxxxxx xxxxx, xx xxxxxxxx xxx xxxxxxxxxxx xxxx xxxxxxx xxxx (xxxxxx xx xxxx xxxxxxxxxx xxx xxxxxxxxx).
xxx::xxxxxxxxx_xxx, xxx::xxx, xxx::xxxxxxxxx_xxx, xxx::xxx xxx xxxxxxx xxx xxxxxx, xx xxx xxxx.

xxxxxxxx

[]{ xxxxxxxxxxx x; xxx::xxxxxx<xxxx xxxx> xxx; xxx.xxxx_xxxx(x.xxxxxx(x, xx)); xxx.xxxx_xxxx(x.xxxxxx(x, xx)); xxx.xxxx_xxxx(x.xxxxxx(-x, xx)); xxx.xxxx_xxxx(x.xxxx(x).xxxxx_xx(-x)); xxx.xxxx_xxxx(x.xxxx(-x).xxxxx_xx(-x)); xxx.xxxx_xxxx(x.xxxx(x).xxxxx_xx(-x)); xxx.xxxx_xxxx((xxxx xxxx)x.xxxx()); xxxxxx xxx; }()
// [x, x, x, xx, xx, -x, x]  (xxxxxx xxxxxx xxxxxxxxxx xxx xxxxxxx xxxxx)

[]{ xxxxxxxxxxx x; xxx (xxxx xxxx x = x; x < xx; ++x) x.xxxxxx(x, x * x); xxx::xxxxxx<xxxx xxxx> xxx; xxx.xxxx_xxxx(x.xxxxx(x)); xxx.xxxx_xxxx(x.xxxxx(x)); xxx.xxxx_xxxx(x.xxxx(x).xxxxx_xx(-x)); xxx.xxxx_xxxx(x.xxxx(x).xxxxx_xx(-x)); xxx.xxxx_xxxx((xxxx xxxx)x.xxxx()); x.xxxxxx(x, xx); xxx.xxxx_xxxx(x.xxxx(x).xxxxx_xx(-x)); xxx.xxxx_xxxx((xxxx xxxx)x.xxxx()); xxxxxx xxx; }()
// [x, x, -x, xx, x, xx, xx]  (xxxxx xx xxxxxxxxxx; xx-xxxxxx xxxxx xxxxx xxxxx)

xxxxxxxxxxx

xxxx xxx xxxxxx xxxx xxx xxxx xxxx xxxx xxxxx (xxxxxxxx xxxx xxxxxxxx).
xxx xxxxxx xxxxx xxxxxxx xx,xxx xxxxxx/xxxxx/xxxx xxxxxxxxxx xxxx x xxxxx xxx xxxxx (xxxxxxx xxxxxxxxx xxxxxxxx, xxxxxxxx xxxxxxx xx xxxxxx), xxxxxx xx xxx,xxx xxxx, xxx x xxxxxxxxxxx xxx xx xxx,xxx xxxxx xxxxxxxxxx xxxx x xxx,xxx-xxx xxxxxxx xxx. x xxxxxx xxxx xxxx x xxxxxx xx xxxxx xxxxx xxxx xxx xxxxxxx xx xxxx xxx; xxx xxxx xxxxx xxxx xx xx xxxx xx xxxxxxxxxxxx.
xxxxxxxx x(x) xxxxxxxxx xxx xxxxxxxxx xx xxx xxxxxx xxxx xxxxxx.

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Language: C++FlatHashMap

#include <cstddef>
#include <cstdint>
#include <optional>
#include <vector>

// ...
// ...
// ...
// ...
// ...
class FlatHashMap {
public:
    FlatHashMap() {
        // ...
    }

    bool insert(long long key, long long value) {
        // ...
        // ...
        (void)key;
        (void)value;
        return false;
    }

    bool erase(long long key) {
        // ...
        (void)key;
        return false;
    }

    std::optional<long long> find(long long key) const {
        // ...
        (void)key;
        return std::nullopt;
    }

    std::size_t size() const {
        // ...
        return 0;
    }
};

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