01. Basic Stack Operators

#include <iostream>
#include <climits>
#include <stack>
#include <string>
#include <vector>
#include <sstream>
using namespace std;

int main()
{
int totalNumbers, popNumbers, searchNumbers;
  cin >> totalNumbers >> popNumbers >> searchNumbers;

  stack<int> buffer;
  for(int i = 0; i < totalNumbers; i++)
    {
      int buf;
      cin >> buf;
      buffer.push(buf);
    }

  for(int i = 0; i < popNumbers; i++)
      buffer.pop();

  if(buffer.size() == 0)
  {
    cout << "0" << endl;
    return 0;
  }

  int smallest = INT_MAX;

  while(buffer.size())
    {
      int top = buffer.top();
      buffer.pop();

      if(top == searchNumbers)
      {
        cout << "true" << endl;
        return 0;
      }

      if(top < smallest)
        smallest = top;
    }

  cout << smallest << endl;
  return 0;
}