题解 | #合并表记录#

这个采用hash表存放数据就好了，每次输入查询是否有存在的key，存在就将value累加到表中，最后输出表。

• java

  import java.util.*;
  public class Main {
   public static void main(String agv[]) {
        Scanner scanner = new Scanner(System.in);
        int tableSize = scanner.nextInt();
        Map<Integer, Integer> table = new HashMap<>(tableSize);
        for (int i = 0; i < tableSize; i++) {
            int key = scanner.nextInt();
            int value = scanner.nextInt();
            if (table.containsKey(key)) {
                table.put(key, table.get(key) + value);
            } else {
                table.put(key, value);
            }
        }
         for (Integer key : table.keySet()) {
            System.out.println( key + " " + table.get(key));
        }
    }
  }