平安科技两道编程题

水深无声 2022-05-08 10:08 224阅读 0赞

# 一、求树的高度 #

import java.util.ArrayList;
    import java.util.Scanner;
     
    public class Main{
        public static void main(String[] args) {
            Scanner in  = new Scanner(System.in);
            ArrayList<String>arr=new ArrayList<>();
            while(in.hasNext()) {
            	arr.add(in.nextLine());
            }
            int n = arr.size()+1;
            if(n<3){
                System.out.println(n);
            }
            else{
                int[] height = new int [n];
                int[] binary = new int[n];
                height[0] = 1;
                int max = 0;
                for(int i = 0;i<n-1;i++){
    	            String[]str=arr.get(i).split("\\s+");
                    int parent = Integer.valueOf(str[0]);
                    int child = Integer.valueOf(str[1]);
                    binary[parent] += 1;
                    if(binary[parent] < 3){
                        height[child] = height[parent]+1;
                    }
                    max = Math.max(max, height[child]);
                }
                System.out.println(max);
            }
        }
    }

# 二、平均成绩降序输出 #

import java.util.*;
    import java.util.Map.Entry;
     
    public class Main {
     
        public static void main(String[] args) {
         
            Scanner sc = new Scanner(System.in);
            HashMap<String,Integer>map=new HashMap<>();
            while(sc.hasNext()) {
            	String[] str=sc.nextLine().split("\\s+");
            	double sum=0;
            	for(int i=1;i!=str.length;i++) {
            		
            		sum+=Integer.valueOf(str[i]);
            	}
            	map.put(str[0], (int) Math.round(sum/(str.length-1)));
            	
            }
        	List<Map.Entry<String, Integer>> list = new ArrayList<Map.Entry<String, Integer>>(map.entrySet());
    		Collections.sort(list, new Comparator<Map.Entry<String, Integer>>() {
    			//降序排序
    			@Override
    			public int compare(Entry<String, Integer> o1, Entry<String, Integer> o2) {
    				//return o1.getValue().compareTo(o2.getValue());
    				return o2.getValue().compareTo(o1.getValue());
    			}
    		});
     
    		for (Map.Entry<String, Integer> mapping : list) {
    			System.out.println(mapping.getKey() + " " + mapping.getValue());
    		}
    
            
        }
    }