Algorithms

In-Memory Key-Value Store

Difficulty

Asked at Two Sigma

Theory: Algorithms Under a Complexity Bound

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Available in Python and C++. You are solving it in C++. Switch to Python

x xxx-xxxxx xxxxx xxxx xxxxxx xxxxxxxxxxxx, xxxxx xx xxx xxxxxxxxx xxxxxxxx xxxxxx xxxxxx xxxxx "xxxxxxxxx x xxxxxx xxxxxxxx" xxxxxx. xxx(xxx, xxxxx), xxx(xxx) xxxxxxxxx xxxx xx xxxxxx, xxxxxx(xxx) xxxxxxxxx xxxxxxx xx xxx xxxxx xxxxx(xxxxx): xxx xxxx xxxx xxxxxxxxx xxxx xxxx xxxxx xxxxx(), xxxxxx(), xxxxxxxx(): xxx xxxx xxx xxxxxx xxxxx xx xx xxxxxxxxxxx xx xxxx xxxxx(): xxx xxxx xxx xxxx xxxxx() xxx xxx() xxxxxx xxxx xxxxxxxx x.xxx('x', x); x.xxx('x', x); x.xxx('x', x) x.xxxxx(x) # x x.xxxxx() x.xxx('x', x) x.xxxxx(x) # x x.xxxxxxxx() x.xxxxx(x) # x, xxx xxx('x') xx x xxxxx xxx xxxx xxxx xxxxxxx xxxxxxx xxx xxxxxxx xx xxxx: x.xxxxx(); x.xxx('x', x) x.xxxxx(); x.xxx('x', x); x.xxxxxx() # xxxxx xxxxxx x.xxxxxxxx() # xxxxx xxxxxxxx x.xxx('x') # xxxx xxxxxxxxxx xx xxxxx xxxxxxxxxxx xxxx xxx xxxx xxx xxxxxx xxxxxxxxx. xx xxxxxxxxx xxxxxxxx xxxx xxxxx xxxxxxx xxxx. xxx xxxxxx xxxx xxxxx xxx: x xxxxx xx xxxxx xxxxxxxx xxxxxxx xx xxxx xxx xxxx: xxxxxxxxx xxx xxxxx xxxxxxxxxxx xxxxx xx xxx xxxxx xxxx xxxxxx xx xxxxx, xxxxx xx xxx xxxxxxx xxxxx. xxxxxxx x xxxxxx xx xxx xxxxxx x xxxxxx. xxxxxxxxxxx xx xx ( x xxxxx xx^x ) xxxxxxxxxx, xxxx xxxxxxxxxxxx xxxxxx xx xx xxx xxxx xxxx x xxxxx xx ( x xxxxx xx^x ) xxxx. xxxxx() xx xxxxxx xx xxxxx xx xxx(), xx xx xxxx xxx xxxx xxx xxxxx. xxxxxxx xxx xxxxx xxx xx xxxxx() xxxxx xxx xxxxx ( x(x) ) xxx xxxxxxxxxxx. xx xxxx xxx xxxxx ( x(x) ) xx xxxx xxx ( x(xxxx{xxxxxxx}) ) xx xxxx xxxx, xxxxx xx xxxx x xxxx xxxxxx xxxx. xxxxxxxx xxxxx xxxxx() xxxx xxx xx xxxx xxxxxxx xxxxxxx x xxxxxxxx xx xxxx xx xxxxxxx xxxxxx. x xxxxx xxxx xx xxxxx xxxxx xxx xxx xxxxx xxxxx xxxxxxxx xx xxx xxxxxxxx xxxxxxx xxxx, xxx xx xx xxxxxxxxx xxxxxx x xxxx xxxxx xxxx xxx xxxx xxxxxx. xx x++ xxxxx xxxxxxx { xxxxxx: xxxx xxx(xxxxx xxx::xxxxxx& xxx, xxxx xxxx xxxxx); xxx::xxxxxxxx<xxxx xxxx> xxx(xxxxx xxx::xxxxxx& xxx) xxxxx; xxxx xxxxxx(xxxxx xxx::xxxxxx& xxx); xxxx xxxx xxxxx(xxxx xxxx xxxxx) xxxxx; xxxx xxxxx(); xxxx xxxxxx(); xxxx xxxxxxxx(); xxx xxxxx() xxxxx; }; xxxx xxx xxxxxxx xxx xxxxxx xxx xxxxxxxx. xxx xxxxxxx xxx::xxxxxxx xxxxx xxx xxxxxx xxxxxxx xxxx, xxxxxx xx x xxxxxxx xx x++ xx xxx xxxxxx xx xxxxxx, xxx xxx xxx xxxxx xxxxxx xxxxxxx.

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Language:

Python 3.12 C++23

KvStore

#include <optional>
#include <string>

// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
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// ...
class KvStore {
public:
    void set(const std::string& key, long long value) {
        // ...
        (void)key;
        (void)value;
    }

    std::optional<long long> get(const std::string& key) const {
        // ...
        (void)key;
        return -1;
    }

    bool remove(const std::string& key) {
        // ...
        (void)key;
        return false;
    }

    long long count(long long value) const {
        // ...
        (void)value;
        return -1;
    }

    void begin() {
        // ...
    }

    bool commit() {
        // ...
        return false;
    }

    bool rollback() {
        // ...
        return false;
    }

    int depth() const {
        // ...
        return -1;
    }
};

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