[Solved] Skip last K lines while traversing a file [closed]

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Why not simply put lines into a std::deque and dump one element when its size is greater k ?

#include<iostream>
#include<fstream>
#include<deque>


int main()
{
    std::fstream fs;
    fs.open("output.txt",std::ios::in);
    std::deque<std::string> deq;
    std::string str;
    int k=2;
    while(std::getline(fs,str))
    {
            deq.push_back(str);
            if(deq.size() > k)
            {
              std::cout <<deq.front()<<std::endl;
              deq.pop_front();
            }
    }

}

solved Skip last K lines while traversing a file [closed]