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Answer Posted / vadivel t
Heap memory menager is a person, who is responsible for
dynamic memory allocation. He will maintains a internal
data structure(table) to update the information on free and
allocated memory pools. when memory is allocated using
malloc or calloc, the heap memory manager will update the
table(which tells, no of bytes allocated to a particular
pointer) and returns the base address to the application.
when application calls free() with the pointer to be freed
as a argument, free will look into the table which holds no
of bytes allocated for that pointer. And it will free those
many bytes from the base address. Again the freed memory
shall be added to a free memory pool so that other fellows
who needs memory can utilise it.
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Why pointers are used?
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
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