Amazon Interview Question for SDE-3s

Country: United States

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of 0 vote

#include <iostream>
#include <queue>
#include <thread>
#include <atomic>

class TwitterTag 
    unsigned long _last_24hr_count{0};
    std::queue<unsigned int> _per_min_count;
    std::atomic<unsigned int> _last_1min_count{1u};


    void mention()

    void Start()
        while (true)
            if(_per_min_count.size() >= 60*24 /*number of min in 24 hrs*/)
                _last_24hr_count += _last_1min_count;
                auto earliest_count = _per_min_count.front();
                _last_24hr_count -= earliest_count;

    const TwitterTag& instance()
        static TwitterTag _instance;
        static std::thread _thread([this]{Start();});
        return _instance;

    bool istrending()/*if last 24 hour mention is more than 100000, it is trending*/
        return _last_24hr_count>100000ul;

int main()
    return 0;

- Anonymous June 07, 2020 | Flag Reply

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