Answer:
#include <iostream>
#include <array>
static std::array<double, 51> nums;
int main()
{
std::array<double, 51> nums;
int for1;
int for2;
for (int i = 0; i < 26; i++)
{
       nums[i] = i;
       for1 = i * i;
       std::cout << for1 << ", ";
       if(i%10==0)
         std::cout << "\n";
}
for (int i = 26; i < 51; i++)
{
       nums[i] = i;
       for2 = i * 3;
       std::cout << for2 << ", ";
       if (i % 10 == 0)
         std::cout << "\n";
}
}
hope i helped :D