10D2

#include <iostream>
#include <iomanip>
#include "func_d.h"

using std::cin;
using std::cout;
using std::endl;

int main()
{
  int n, m;
  cin >> n;
  cin >> m;
  MyVector vec;
  read(vec, n);

  char cmd;
  while (m--) {
    cin >> cmd;
    if (cmd == '+') {
      int index, x;
      cin >> index >> x;
      if (index--) insert(vec, x, index);
      else push_back(vec, x);
    } else if (cmd == '-') {
      int index;
      cin >> index;
      if (index--) erase(vec, index);
      else pop_back(vec);
    } else if (cmd == '?') {
      cin >> cmd;
      if (cmd == '+')
        cout << sum(vec);
      else if (cmd == '/') {
        cout << std::setprecision(4) << std::fixed;
        cout << mean(vec);
      } else if (cmd == '<')
        cout << min(vec);
      else if (cmd == '>')
        cout << max(vec);
      else if (cmd == 'D')
        print_size(vec);
      cout << endl;
    }
  }
  del(vec);
}