题目相关
题目链接
AtCoder Beginner Contest 170 B题,https://atcoder.jp/contests/abc170/tasks/abc170_b。
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.
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.
Samples1
Sample Input 1
3 8
Sample Output 1
Yes
Explaination
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.
Samples2
Sample Input 2
2 100
Sample Output 2
No
Explaination
There is no combination of numbers of cranes and turtles in which this statement is correct.
Samples3
Sample Input 3
1 2
Sample Output 2
Yes
Explaination
We also consider the case in which there are only cranes or only turtles.
Constraints
- 1 ≤ X ≤ 100
- 1 ≤ Y ≤ 100
- All values in input are integers.
题解报告
题目翻译
其实就是鸡兔同笼问题啦。
在院子里有鹤和乌龟,每个鹤有两条腿,每个乌龟有四条腿。然后告诉我们 X 个动物,Y 条腿。问这样的组合是否合法。如果合法输出 Yes,如果不合法,输出 No。
样例数据分析
略。
题目分析
可以直接解方程,然后判断合法性。
也可以直接判断合法性。
数据规模分析
100 以内的数据,没有什么难度。
AC 参考代码
略。
P.S.
水一篇文章吧。

本文解析AtCoderBeginnerContest170B题,即经典的鸡兔同笼问题。通过给出的动物总数X和腿总数Y,判断是否存在合法的鹤和乌龟数量组合。文章提供了解题思路和样例分析。
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