aufgabe2bis4.cpp

#include <cstdlib> 
#include <vector> 
#include <list>
#include <iostream> 
#include <iterator>
#include <algorithm>
#include <map>

int main()
{
  std::list<unsigned int> list1(100);

  for (std::list<unsigned int>::iterator i = list1.begin(); i != list1.end(); 
        ++i) {
    *i = std::rand() % 51;
  }

  std::vector<unsigned int> vec1(100);
  std::copy(list1.begin(), list1.end(), vec1.begin());

/* print vector:
  std::copy(vec1.begin(), vec1.end(), 
            std::ostream_iterator<unsigned int>(std::cout, "\n"));
  std::cout << "-------------------" << "\n";
*/

  std::map<unsigned int,int> ints{};
  for (int i = 0; i <= 50; ++i) {
    ints.insert(std::pair<unsigned int, int>(i, 0));
  }

  for (int i : vec1) {
    ints.at(i) += 1;
  }

  unsigned int numbersCount = 0;
  for (auto it = ints.cbegin(); it != ints.cend(); ++it) {
    if (it->second != 0) ++numbersCount; 
  }

  std::cout << "--------------------------------------" << "\n";
  std::cout << "Number of different list items: " << numbersCount << "\n";
  std::cout << "--------------------------------------" << "\n";

  std::cout << "Numbers from 0 to 50 not in list: " << "\n";
  for (int i = 0; i <= 50; ++i) {
    if (ints[i] == 0) std::cout << i << "\n";
  }

  std::cout << "--------------------------------------" << "\n";

  std::cout << "Frequency of list item:" << "\n";

  for (auto i : ints) {
    if (i.second != 0) {
      std::cout << i.first << " : " << i.second << "\n";
    }
  }



  return 0;
}