[Java][АПС] - Company(Hash)

import java.util.Scanner;

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

    // Each MapEntry object is a pair consisting of a key (a Comparable
    // object) and a value (an arbitrary object).
    K key;
    E value;

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

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

    public String toString () {
        return key + " = " + value + "\n";
    }
}


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

    // An object of class OBHT is an open-bucket hash table, containing entries
    // of class MapEntry.
    private MapEntry<K,E>[] buckets;

    // buckets[b] is null if bucket b has never been occupied.
    // buckets[b] is former if bucket b is formerly-occupied
    // by an entry that has since been deleted (and not yet replaced).

    static final int NONE = -1; // ... distinct from any bucket index.

    private static final MapEntry former = new MapEntry(null, null);
    // This guarantees that, for any genuine entry e,
    // e.key.equals(former.key) returns false.

    private int occupancy = 0;
    // ... number of occupied or formerly-occupied buckets in this OBHT.

    @SuppressWarnings("unchecked")
	public OBHT (int m) {
    // Construct an empty OBHT with m buckets.
        buckets = (MapEntry<K,E>[]) new MapEntry[m];
    }


    private int hash (K key) {
    // Translate key to an index of the array buckets.
        return Math.abs(key.hashCode()) % buckets.length;
    }

    public MapEntry<K,E> getAtIndex(int index){
    	return buckets[index];
    }
    public int search (K targetKey) {
    // Find which if any bucket of this OBHT is occupied by an entry whose key
    // is equal to targetKey. Return the index of that bucket.
        int b = hash(targetKey); int n_search=0;
        for (;;) {
            MapEntry<K,E> oldEntry = buckets[b];
            if (oldEntry == null)
                return NONE;
            else if (targetKey.equals(oldEntry.key))
                return b;
            else
            {
                b = (b + 1) % buckets.length;
                n_search++;
      	        if(n_search==buckets.length)
                    return NONE;

            }
        }
    }


    public void insert (K key, E val) {
    // Insert the entry <key, val> into this OBHT.
        MapEntry<K,E> newEntry = new MapEntry<K,E>(key, val);
        int b = hash(key); int n_search=0;
        for (;;) {
            MapEntry<K,E> oldEntry = buckets[b];
            if (oldEntry == null) {
                if (++occupancy == buckets.length) {
                    System.out.println("Hash tabelata e polna!!!");
                }
                buckets[b] = newEntry;
                return;
            }
            else if (oldEntry == former
                    || key.equals(oldEntry.key)) {
                buckets[b] = newEntry;
                return;
            }
            else
            {
                b = (b + 1) % buckets.length;
                n_search++;
      	        if(n_search==buckets.length)
                    return;

            }
        }
    }


    @SuppressWarnings("unchecked")
	public void delete (K key) {
    // Delete the entry (if any) whose key is equal to key from this OBHT.
        int b = hash(key); int n_search=0;
        for (;;) {
            MapEntry<K,E> oldEntry = buckets[b];

            if (oldEntry == null)
                return;
            else if (key.equals(oldEntry.key)) {
                buckets[b] = former;//(MapEntry<K,E>)former;
                return;
            }
            else{
                b = (b + 1) % buckets.length;
                n_search++;
      	        if(n_search==buckets.length)
                    return;

            }
        }
    }


    public String toString () {
    	String temp = "";
    	for (int i = 0; i < buckets.length; i++) {
    	    if (buckets[i] == null)
    	        temp += "\n";
    	    else if (buckets[i] == former)
    	        temp += "former\n";
    	    else
    	        temp += buckets[i] + "\n";
    	}
    	return temp;
    }


    public OBHT<K,E> clone () {
    	OBHT<K,E> copy = new OBHT<K,E>(buckets.length);
    	for (int i = 0; i < buckets.length; i++) {
    	    MapEntry<K,E> e = buckets[i];
    	    if (e != null && e != former)
    	        copy.buckets[i] = new MapEntry<K,E>(e.key, e.value);
    	    else
    	        copy.buckets[i] = e;
    	}
    	return copy;
    }
}
public class Company{

	public static void main(String [] args) {
		Scanner input = new Scanner(System.in);
		int n = input.nextInt();
		input.nextLine();

		OBHT<String,Integer> hashtable = new OBHT<String,Integer>(n*2+1);
		for(int i=0;i<n;i++) {
			String [] line = input.nextLine().split(" ");
			String employee = line[0];
			String manager = line[1];

			int index = hashtable.search(manager);

			if(index>=0) {
				MapEntry<String,Integer> me = hashtable.getAtIndex(index);
				if(!me.key.equals(employee)) {
					int broj = me.value;
					++broj;
					hashtable.insert(manager, broj);
				}
				else {}
			}else {
				hashtable.insert(manager, 1);
			}
		}
		System.out.println(hashtable.toString());
	}
}