#include <iostream>
#include <algorithm>
 
typedef struct {
  std::string name;
  std::string surname;
  int test;
} StudentsType;
 
 
int main () {
  StudentsType student[3] = {
    {name: "Иван", surname: "Иванов", test: 3},
    {name: "Петр", surname: "Петров", test: 2},      
    {name: "Степан", surname: "Степанов", test: 4}      
  };
  std::cout << "\nДо сортировки:" << std::endl;
  for(const auto &i:student) std::cout << i.surname << " " << i.name << " : " << i.test << std::endl;  
  std::sort(std::begin(student),std::end(student),[&](StudentsType &one, StudentsType &two) {
    return one.test>two.test;    
  });    
  std::cout << "\nПосле сортировки:" << std::endl;
  for(const auto &i:student) std::cout << i.surname << " " << i.name << " : " << i.test << std::endl;    
  return 0;        
}

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