FIND LENGTH OF LIST x = np.array([5, 7, 8, 7, 2, 17, 2, 9, 4, 11, 12, 9, 6]) y= np.array([99, 86, 87, 88, 111, 86, 103, 87, 94, 78, 77, 85, 8 6}) GREATE DATA FRAME RESHAPE ARANGE RANDOM

#include <iostream>

#include <regex>

#include <fstream>

#include <string>

using namespace std;

int main() {

   ifstream fin("f");

   string s = "", _temp;

   while (getline(fin, _temp))

       s += _temp;

   fin.close();

   ofstream fout("g");

   try {

       regex re("[a-z]");

       sregex_iterator next(s.begin(), s.end(), re);

       sregex_iterator end;

       while (next != end) {

           smatch match = *next;

           fout << match.str();

           next++;

       }

   }

   catch (regex_error& e) {

       cout << "smth went wrong.";

   }

   fout.close();

}