题解 | #合并表记录#
合并表记录
https://www.nowcoder.com/practice/de044e89123f4a7482bd2b214a685201
import java.util.*; import java.util.stream.Collectors; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int num = Integer.parseInt(scanner.nextLine()); Map<Integer, Integer> map = new HashMap<>(num); for (int i = 0; i < num; i++) { int key = scanner.nextInt(); int value = scanner.nextInt(); if (map.get(key) == null) { map.put(key, value); } else { Integer oldValue = map.get(key); oldValue += value; map.put(key, oldValue); } } List<Integer> sortedList = map.keySet().stream().sorted().collect( Collectors.toList()); for (Integer key : sortedList) { System.out.println(key + " " + map.get(key)); } } }#每日一刷#