#include<iostream>#include<fstream>#include<string>#include<cstdlib>using namespace std;int main(){    fstream inOut("copyOut",fstream::ate|fstream::in|fstream::out);    if(!inOut)    {        cerr<<"Unable to open file!"<<endl;        return EXIT_FAILURE;    }    auto end_mark=inOut.tellg();    inOut.seekg(0,fstream::beg);    size_t cnt=0;    string line;    while(inOut&&inOut.tellg()!=end_mark&&getline(inOut,line))    {        cnt+=line.size()+1;        auto mark=inOut.tellg();        inOut.seekp(0,fstream::end);        inOut<<cnt;        if(mark!=end_mark)            inOut<<" ";        inOut.seekg(mark);    }    inOut.seekp(0,fstream::end);    inOut<<‘\n‘;    return 0;}