[Java] Task ‘gift1‘: Greedy Gift Givers

/* Use the slash-star style comments or the system won't see your
   identification information */
/*
ID: lincans1
LANG: JAVA
TASK: gift1
*/
import java.io.*;
import java.util.*;

class gift1 {
    
    
	public static void main (String [] args) throws IOException {
    
    
	 // Use BufferedReader rather than RandomAccessFile; it's much faster
	 BufferedReader f = new BufferedReader(new FileReader("gift1.in"));
	 PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("gift1.out")));

	 // to keep the money of group member
	 Map<String, Integer> map = new LinkedHashMap<>();
	 int NP = Integer.parseInt(f.readLine());
	 for (int i = 0; i < NP; i++) {
    
    
		 String name = f.readLine();
		 map.put(name, 0);
	 }
	 String giver = null;
	 while ((giver = f.readLine()) != null) {
    
    
		 StringTokenizer st = new StringTokenizer(f.readLine());
		 int money = Integer.parseInt(st.nextToken());
		 int NG    = Integer.parseInt(st.nextToken());
		 if (NG == 0) continue;
		 for (int i = 0; i < NG; i++) {
    
    
			 String receiver = f.readLine();
			 map.put(receiver, map.get(receiver) + money / NG);
		 }
		 map.put(giver, map.get(giver) + money % NG - money);
	 }
	 for (String name : map.keySet()) {
    
    
		 out.println(name + " " + map.get(name));
	 }
	 out.close();
	}
}