Problem:
Score : 200 points

Problem Statement

There are some animals in a garden. Each of them is a crane with two legs or a turtle with four legs.

Takahashi says: "there are X animals in total in the garden, and they have Y legs in total." Determine whether there is a combination of numbers of cranes and turtles in which this statement is correct.

Constraints

1 \leq X \leq 100

1 \leq Y \leq 100

All values in input are integers.

Input

Input is given from Standard Input in the following format:

X Y

Output

If there is a combination of numbers of cranes and turtles in which the statement is correct, print Yes; otherwise, print No.

Sample Input 1

3 8

Sample Output 1

Yes

The statement "there are 3 animals in total in the garden, and they have 8 legs in total" is correct if there are two cranes and one turtle. Thus, there is a combination of numbers of cranes and turtles in which the statement is correct.

Sample Input 2

2 100

Sample Output 2

No

There is no combination of numbers of cranes and turtles in which this statement is correct.

Sample Input 3

1 2

Sample Output 3

Yes

We also consider the case in which there are only cranes or only turtles.

Solution in Java (OpenJDK 11.0.6) (judge verdict: Wrong Answer)


import java.util.Map.Entry;
import java.util.*;
import java.math.*;
import org.w3c.dom.css.Counter;
  
public class Main{
    public static void main(final String[] args){
 
        final Scanner sc = new Scanner(System.in);
        int headSum =sc.nextInt();
        int footSum =sc.nextInt();
        int turu;
        int kame;
        //全部亀
        int kameFoot = headSum * 4;
        if(kameFoot > footSum){
            if((footSum-kameFoot)%2 ==0||(footSum-kameFoot)/2 <=headSum){
                System.out.println("Yes");
            }else{
                System.out.println("No");
            }
        }else{
            System.out.println("No");
        }

       }
    }
        /*  int N =sc.nextInt();
        int K =sc.nextInt();
        Map<Integer,Integer> numMap = new HashMap<>();
        Map<Integer,Integer> newMap = new HashMap<>();
        Map<Integer,Integer> hogeMap = new HashMap<>();
        if(N>41){

        }
        for(int i =1;i<=N;i++){
            numMap.put(i, sc.nextInt());
            newMap.put(i,0);
            hogeMap.put(i,0);
        }
        for(int i= 0;i<K;i++){
            //newMap =  numMap;

            for(int i2= 1; i2<=N;i2++){

                    for(int i4 =0 ;i4 <=numMap.get(i2)&&i4+i2<=N;i4++){
                        newMap.replace(i2+i4, newMap.get(i2+i4)+1);
                        if(i4<i2&&i4 != 0){
                            newMap.replace(i2-i4, newMap.get(i2-i4)+1);
                        }
                    }
   /*                  for(int i4 =1 ;i4<i2&&i4<=numMap.get(i2);i4++){
                        newMap.replace(i2-i4, newMap.get(i2-i4)+1);
                    } */