Data Structures

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Difficulty

Asked at Citadel Securities, Five Rings

Theory: Data Structures You Implement, Not Import

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Language: C++23SkipList

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

// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
// ...
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class SkipList {
public:
    static constexpr std::size_t kMaxLevel = 16;

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

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

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

    long long size() const { return size_; }

    long long height() const {
        // ...
        return 0;
    }

    long long height_of(long long key) const {
        // ...
        (void)key;
        return 0;
    }

    long long hops(long long key) const {
        // ...
        (void)key;
        return 0;
    }

private:
    struct Node {
        long long key = 0;
        long long value = 0;
        std::vector<Node*> next;
    };

    std::vector<Node*> head_ = std::vector<Node*>(kMaxLevel, nullptr);
    long long size_ = 0;
    long long inserts_ = 0;
};

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