题解 | #合并表记录#
合并表记录
https://www.nowcoder.com/practice/de044e89123f4a7482bd2b214a685201
import java.util.*; // 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 in = new Scanner(System.in); HashMap<Integer, Integer> map = new HashMap<>(); int m=in.nextInt(); while (m!=0) { // 注意 while 处理多个 case int a = in.nextInt(); int b = in.nextInt(); if (map.containsKey(a)) { map.replace(a, b + map.get(a)); }else{ map.put(a,b); } m--; } TreeMap<Integer, Integer> sortedMap = new TreeMap<>(map); for (Map.Entry<Integer, Integer> entry : sortedMap.entrySet()) { System.out.println(entry.getKey() + " " + entry.getValue()); } in.close(); } }