华为机试（取近似值，合并表，提取不重复整数，字符个数统计）Java实现

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
/**
 * Created by a819 on 2017/9/2.
 */
import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner cin=new Scanner(System.in);
        while (cin.hasNext()){
            float f=cin.nextFloat();
            int z=(int)f;
            if (f-z>=0.5)
                System.out.println(z+1);
            else System.out.println(z);
        }

        
    }
}

1
2
先输入键值对的个数
然后输入成对的index和value值，以空格隔开

1
输出合并后的键值对（多行）

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
/**
 * Created by a819 on 2017/9/2.
 */
import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner cin=new Scanner(System.in);
        //HashMap<Integer,Integer> res=new HashMap<>();
        while(cin.hasNext()){
            TreeMap<Integer,Integer> res=new TreeMap<>();
            int n=cin.nextInt();
            for (int i=0;i<n;i++){
                int key=cin.nextInt();
                int value=cin.nextInt();
                if (res.containsKey(key)){
                    value+=res.get(key);
                    res.put(key,value);
                }
                else
                    res.put(key,value);
            }
            for (int m:res.keySet()){
                System.out.println(m+" "+res.get(m));
            }

        }

    }
}