#include <iostream>
#include <vector>
using std::vector;

void fun(int n) {
   vector<int> vec;
   for (int i = 0; i < n; ++i) {
      vec.push_back(rand() % 100);
      std::cout << vec.size() << "\t" << vec.capacity() << std::endl;
   }
}

int main() {
   fun(10);
   vector<int> vec(100);
   vec.push_back( rand() % 100 );
   std::cout << vec.size() << "\t" << vec.capacity() << std::endl;

   vector<int> vec2;
   vec2.reserve(100);
   vec2.push_back( rand() % 100 );
   std::cout << vec2.size() << "\t" << vec2.capacity() << std::endl;
   
   return 0;
}