Решение задач с помощью уравнений

#include <iostream>

#include <cstring>

#include <algorithm>

#include <cmath>

using namespace std;

int d[10001];

int main ()

{

      string s[100001];

            for (int i = 0; i < 3;  ++i)

            {

                  getline(cin, s[i]);

                  int sum = 0;

                  for (int j = 0; j < s[i].size(); ++j)

                  {

                        if (s[i][j] == '.')

                        {

                              sum++;

                        }

                  }

                  if (sum == 0)

                  {

                        for (int j = 0; j < s[i].size(); ++j)

                        {

                              if (s[i][j] >= 97  && s[i][j] <= 122)

                              s[i][j] -= 32;

                        }

                  }

                  if (i == 2)

                  {

                        cin >> d[i];

                        d[i] *= 2; 

                  }

            }

            for (int i = 3; i < 20;++i)

            {

                  getline(cin , s[i]);

                  cin >> d[i];

                  d[i] *= 2;

            }

            for (int i = 0; i < 3; ++i)

            {

                  if  (i == 0)

                  {

                        cout << "\n" << s[i];

                  }

                  else{

                        cout << "\n" << "\n" << s[i];

                  }

                  if (i == 2)

                  {

                        cout << d[i];

                  }

            }

            for (int i = 3; i < 20;++i)

            {

                  cout <<  s[i];

                  cout <<  d[i];

            }

}