1 import java.util.ArrayList; 2 import java.util.List; 3 import java.util.Scanner; 4  5 public class Main { 6  7     public static void main(String[] args) { 8          9         Scanner sc=new Scanner(System.in);10         11         List<Record> list=new ArrayList<Record>();12         while(true){13             14             int a=sc.nextInt();15             int b=sc.nextInt();16             17             if(a==0 && b==0){18                 for(int i=0;i<list.size();i++){19                     Record t=list.get(i);20                     System.out.println(t.region+" "+t.count);21                 }22                 return;23             }else{24                 int t=list.indexOf(new Record(a));25                 if(t!=-1){26                     list.get(t).count+=b;27                 }else{28                     list.add(new Record(a,b));29                 }30             }31         }32     }33     34     static class Record{35         int region;36         int count;37         public Record(int region) {38             this.region = region;39         }40         public Record(int region, int count) {41             this.region = region;42             this.count = count;43         }44         @Override45         public boolean equals(Object obj) {46             Record t=(Record)obj;47             return this.region==t.region;48         }49     }50     51 }