[ADS] Password

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;

class MapEntry<K extends Comparable<K>,E> implements Comparable<K> {

    K key;
    E value;

    public MapEntry (K key, E val) {
        this.key = key;
        this.value = val;
    }

    public int compareTo (K that) {
        @SuppressWarnings("unchecked")
        MapEntry<K,E> other = (MapEntry<K,E>) that;
        return this.key.compareTo(other.key);
    }

    public String toString () {
        return "(" + key + "," + value + ")";
    }
}

class SLLNode<E> {
    protected E element;
    protected SLLNode<E> succ;

    public SLLNode(E elem, SLLNode<E> succ) {
        this.element = elem;
        this.succ = succ;
    }

    @Override
    public String toString() {
        return element.toString();
    }
}

class CBHT<K extends Comparable<K>, E> {

    private SLLNode<MapEntry<K,E>>[] buckets;

    @SuppressWarnings("unchecked")
    public CBHT(int m) {
        buckets = (SLLNode<MapEntry<K,E>>[]) new SLLNode[m];
    }

    private int hash(K key) {
        return Math.abs(key.hashCode()) % buckets.length;
    }

    public SLLNode<MapEntry<K,E>> search(K targetKey) {
        int b = hash(targetKey);
        for (SLLNode<MapEntry<K,E>> curr = buckets[b]; curr != null; curr = curr.succ) {
            if (targetKey.equals(((MapEntry<K, E>) curr.element).key))
                return curr;
        }
        return null;
    }

    public void insert(K key, E val) {      // Insert the entry <key, val> into this CBHT.
        MapEntry<K, E> newEntry = new MapEntry<K, E>(key, val);
        int b = hash(key);
        for (SLLNode<MapEntry<K,E>> curr = buckets[b]; curr != null; curr = curr.succ) {
            if (key.equals(((MapEntry<K, E>) curr.element).key)) {
                curr.element = newEntry;
                return;
            }
        }
        buckets[b] = new SLLNode<MapEntry<K,E>>(newEntry, buckets[b]);
    }

    public void delete(K key) {
        int b = hash(key);
        for (SLLNode<MapEntry<K,E>> pred = null, curr = buckets[b]; curr != null; pred = curr, curr = curr.succ) {
            if (key.equals(((MapEntry<K,E>) curr.element).key)) {
                if (pred == null)
                    buckets[b] = curr.succ;
                else
                    pred.succ = curr.succ;
                return;
            }
        }
    }

    public String toString() {
        String temp = "";
        for (int i = 0; i < buckets.length; i++) {
            temp += i + ":";
            for (SLLNode<MapEntry<K,E>> curr = buckets[i]; curr != null; curr = curr.succ) {
                temp += curr.element.toString() + " ";
            }
            temp += "\n";
        }
        return temp;
    }

}

public class Lozinki {
    public static void main (String[] args) throws IOException {
        // CBHT<String,String> tabela;
        // BufferedReader br = new BufferedReader(new InputStreamReader(
        //      System.in));
        // int N = Integer.parseInt(br.readLine());
        // //---Vie odluchete za goleminata na hesh tabelata----
        // tabela = new CBHT<String,String>(???);
        // for(int i=1;i<=N;i++){
        //  String imelozinka = br.readLine();
        //  String[] pom = imelozinka.split(" ");
        //  tabela.insert(pom[0], pom[1]);
        // }

        /*
        *
        * Vashiot kod tuka....
        *
        */

    Scanner scanner = new Scanner(System.in);
    int exists = scanner.nextInt();
    CBHT<String, String> table = new CBHT<String,String>(exists);
    StringBuffer sb = new StringBuffer();
    for(int i = 0 ; i < exists ; i ++){
        String username = scanner.next();
        String password = scanner.next();

        //ana banana
        //pero zdero
        sb.append(String.format("%s %s\n", username,password));
        table.insert(username, password);
    }

    while(scanner.hasNext()){
        String username = scanner.next();
        if(username.equals("KRAJ"))
            break;
        String password = scanner.next();
        SLLNode<MapEntry<String,String>> query = table.search(username);
        if(query!=null &&query.element.value.equals(password)){
            System.out.println("Najaven");
                break;
        }else{
            System.out.println("Nenajaven");
        }


    }
}
}