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//Погружение
void siftdown(int *a, int i, int n){
	int s = min_child(a, i, n);
	std::cout << "min_child called" << std::endl;
	while((s != 0) && (a[i] > a[s])){
		std::cout << "while loop" << std::endl;
		std::swap(i, s);
		i = s;
		s = min_child(a, i, n);
	}
}

prog.cpp: In function 'void siftdown(int*, int, int)':
prog.cpp:3:27: error: 'min_child' was not declared in this scope
  int s = min_child(a, i, n);
                           ^
prog.cpp:4:2: error: 'cout' is not a member of 'std'
  std::cout << "min_child called" << std::endl;
  ^
prog.cpp:4:37: error: 'endl' is not a member of 'std'
  std::cout << "min_child called" << std::endl;
                                     ^
prog.cpp:6:3: error: 'cout' is not a member of 'std'
   std::cout << "while loop" << std::endl;
   ^
prog.cpp:6:32: error: 'endl' is not a member of 'std'
   std::cout << "while loop" << std::endl;
                                ^
prog.cpp:7:3: error: 'swap' is not a member of 'std'
   std::swap(i, s);
   ^

Standard output is empty