题号：NC222154
时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
64bit IO Format: %lld
时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
64bit IO Format: %lld
题目描述
There are 
small balls with same weight in horizontal smooth plane. And the volume of these balls can be negligible. All the balls are on the same straight line. There are three possibilities for their initial speed 
which is 
m/s, 
m/s and 
m/s.
The initial speed of means that the ball moves to the left along a straight line, the initial speed of means that the ball is still at first, and the initial speed of means that the initial speed of the ball moves to the right in a straight line.
A fully elastic collision occurs when two balls collide against each other.
Fully elastic collision formula isv_1%2B2m_2v_2%7D%7B%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3Bm_1%2Bm_2%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%7D%5C%5C%20%5C%3B%20%20%5C%5C%20%20v_2%3D%5Cfrac%7B(m_2-m_1)v_2%2B2m_1v_1%7D%7B%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3Bm_1%2Bm_2%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%20%5C%3B%7D%5Cend%7Bmatrix%7D%5Cright.)
Among them,
represent the weight of the two objects that collided. 
represent the speed before the collision.
Don't be worried, this question is not a physics question. You only need to know the exchanging speed at which two objects of exactly the same weight when they collide.
Given the positions and speeds of balls at the beginning, find their positions 
seconds later.
The initial speed of
A fully elastic collision occurs when two balls collide against each other.
Fully elastic collision formula is
Among them,
Don't be worried, this question is not a physics question. You only need to know the exchanging speed at which two objects of exactly the same weight when they collide.
Given the positions and speeds of
输入描述:
There are two integers in the first input line
In nextindicating the initial position and speed of the ball.
It is guaranteed in all input data that all the balls are in different positions at the beginning
输出描述:
There areinteger represents the position of the
示例1
说明
In the first case, assuming the positive direction is the right side, the ballcollide in the
second, and the ball
second, the
ball and the
ball collided. After the collision, the
second, the ball
collided. Since the volume of the ball is negligible, it can be considered that the positions of both balls are at