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

bool verificarVectorOrdenado(const vector<int> & v, int fin) {

  if (fin < 1)
    return true;

  if (v[fin] < v[fin - 1])
    return false;

  return verificarVectorOrdenado(v, fin - 1);

}

bool verificarVectorOrdenado(const vector<int> & v) {

  return verificarVectorOrdenado(v, v.size() - 1);

}


int main () {

  vector<int> v1 = {11, 22, 33, 44, 55}, v2 = {77, 66, 88}, v3 = {99};

  if ( verificarVectorOrdenado(v1) )
    cout << "OK" << endl;
  else
    cout << "ERROR" << endl;

  if ( ! verificarVectorOrdenado(v2) )
    cout << "OK" << endl;
  else
    cout << "ERROR" << endl;

  if ( verificarVectorOrdenado(v3) )
    cout << "OK" << endl;
  else
    cout << "ERROR" << endl;


}