A set of N billiard balls are set on a one-dimensional table. The table is 1 meter long, set north-south with two pockets at either side. Each ball has zero width and there is no friction so it is moving with a fixed velocity of either northward or southward and bounces back in a perfect elastic collision from other balls it encounter on its way (or drop into one of the pockets). Your job is to keep track of the balls movements. Task Please write a program that gets the initial place, speed and direction of all the balls and gives the position of a specific ball after t seconds. Input The first line contains the number of scenarios. Each one of the other lines in the input contains a scenario: The first number, N, is the number of balls; followed by N pairs of numbers: the distance in centimeters from the south end of the table and the speed (positive speed meaning it moves northward); the last two numbers are the number i of the target ball you should track and the time T in seconds. Output The output is a single number for each line which is the place (distance in centimeters from the south end of the table) of the tracked ball after T seconds. Note: There is no new line character at the end of the result. Sample Input 5 1 50 1 1 1000 1 50 1 1 6 1 60 -2 1 6 2 10 1 95 -1 2 30 2 10 1 95 -1 2 60 Sample Output 100 56 48 65 70

2628

How do I enable activex controls in powerpoint?

709

Explain if-else-if terminology?

1

Why do we use polymorphism?

1017

How many levels of pointers can you have?

1139

Tell me the use of the split function in python?

929

What is retain count?

1

What is a program flowchart and explain how does it help in writing a program?

1232

What is mvc in php?

967

Why is drupal used?

117

Tell me how you define instance variable, global variable and class variable in ruby?

1

What is lumen?

695

What is use of integral promotions in c?

1079

Does python supports interfaces like in java or c#?

815

How are modules used in a python program ?

461