题解 | #合并表记录#
合并表记录
https://www.nowcoder.com/practice/de044e89123f4a7482bd2b214a685201
import java.io.BufferedInputStream; import java.util.Map; import java.util.Scanner; import java.util.TreeMap; public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); Integer num = in.nextInt(); Map<Integer, Integer> map = new TreeMap<>(); for (int i = 0; i < num; i++) { if (i == 0) { map.put(in.nextInt(), in.nextInt()); } else { Integer one = in.nextInt(); Integer two = in.nextInt(); if (map.containsKey(one)) { map.put(one, map.get(one) + two); } else { map.put(one, two); } } } for (Integer key : map.keySet()) { System.out.println(key + " " + map.get(key)); } } }