Data Structures

Trailing Volume Tracker

Difficulty

Asked at The Voleon Group

Theory: Data Structures You Implement, Not Import

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

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Language:

Python 3.12 C++23

run_ops

#include <string_view>
#include <vector>

class TrailingVolume {
public:
    // ...
    explicit TrailingVolume(long long window) {
        // ...
        (void)window;
    }

    // ...
    // ...
    void add(long long ts, long long qty) {
        // ...
        (void)ts;
        (void)qty;
    }

    // ...
    // ...
    long long volume(long long ts) {
        // ...
        (void)ts;
        return -1;
    }
};

// ...
struct Op {
    std::string_view kind;
    long long ts = 0;
    long long qty = 0;
};

// ...
// ...
std::vector<long long> run_ops(long long window, const std::vector<Op>& ops) {
    TrailingVolume tracker(window);
    std::vector<long long> out;
    for (const Op& op : ops) {
        if (op.kind == "add") {
            tracker.add(op.ts, op.qty);
        } else {
            out.push_back(tracker.volume(op.ts));
        }
    }
    return out;
}

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