Spellchecker (S-N)

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

int n;
string rjecnik[1000];

bool provjeri(string s)
{
     for (int i=0; i<n; i++)
         if (s==rjecnik[i])
            return true;
     return false;
}

void spell(string s)
{
     for (int i=0; i<n; i++)
         if (s.substr(0, s.length()-1) == rjecnik[i].substr(0, rjecnik[i].length()-1))
            {
                         cout << rjecnik[i];
                         break;
            }
}

main()
{
      int p = 0;
      string s, k="";

      cin >> n;
      for (int i=0; i<n; i++)
      cin >> rjecnik[i];

      // praznjenje buffera
      fseek(stdin,0,SEEK_END);
      getline(cin, s);
      s = s + " ";

      for(int i=0; i<s.length(); i++)
      if ((s[i]<=122 && s[i]>=97)||(s[i]<=90 && s[i]>=65))
          k = k + s[i];
      else
      {
          if (k!="")
          {
               p++;
               if (provjeri(k)==false)
               {
                  cout << k << " ";
                  spell(k);
                  cout << endl;
               }
          }
          k = "";
      }

      system("PAUSE");
}