Information is present in the screenshot and below. Based on that need help in solving the code for this problem in python. The time complexity has to be as less as possible (nlogn or n at best, no n^2). Apply greedy algorithm to the problem. Make sure both test cases return correct answers.Output FormatThe output consists of a single integer n, which is the minimum margin in milliseconds that would make it such that at least R% of the button presses would be graded as Perfects. If no such margin exists, print "It's impossible!" (without quotes).Sample Input 05 405 8714 -122 27125 62846 -1Sample Output 0249Explanation 0A 40% accuracy means that the two most accurate notes must be considered perfect. The error margin of the first note (5, 87) is |87 - 5| = 82 and the error margin of the third note (22, 271) is |271 - 22| = 249. Other notes would have higher margins, and the second and fifth notes are both Misses, therefore the minimum margin such that 40% of the notes may be considered perfect is the error margin of the third note, 249.Sample Input 16 6211 25128 26166 -173 -180 66686 929Sample Output 1843Explanation 1A 62% accuracy means that out of six notes, the four most accurate notes must be considered perfect. Two notes are Misses, the third and fourth notes. This means that the highest error margin among the other four notes will be the minimum error margin such that 62% of the six notes would be considered Perfect. The sixth note has the highest error margin of |929 - 86| = 843.The actual code""" n - number of notes r - target accuracy date times contains: t_i (actual time in ms start of the chart) p_i (actual time the player pressed the button in ms)"""def solve(n,r,times): # compute for and return answer here def main(): n, r = list(map(int,input().strip().split(" "))) times = [list(map(int,input().strip().split(" "))) for i in range(n)] print(solve(n,r,times))if __name__ == "__main__": main() In 1987, often credited as the first rhythm game PaRappa the Rapper introduced the core mechanic of rhythmgames, repeating a preprogrammed pattern within an allowable amount of time. A decade later, Beatmaniawould introduce more modern mechanics, like scoring based on how accurate one's button presses are to theactual time they need to be pressed, which would become a staple mechanic among all classic rhythm games.When a note appears on screen in a rhythm game, players would need to press the button that correspondsto the note at a specific time. This is usually indicated by the note slowly approaching a note bar. The buttonpress is then graded depending on how close to the bar the note is when the button is pressed, whichcorresponds to how many milliseconds the button press is off from perfect timing. If the button press is withinn milliseconds of the note hitting the note bar, where n is a small time limit, the button press is given aPerfect grade. Suppose it is within m milliseconds, where m is greater than n but is still within an allowablelimit. In that case, the button press is considered Good. Outside of m, then the button press is considered amiss. This is repeated for all the notes in a chart; a chart corresponds to a level or a song that contains a set ofnotes.Consider the following image:The white bar is the note bar, while the red rectangle is the note. Imagine this red rectangle has beenapproaching the note bar from the top of the screen. The note is currently right on top of the note bar. If theplayer presses the button now, it is considered a Perfect. However, it would still be considered a perfect if thebutton is pressed while the red rectangle (the note) is within the green area (the Perfect area). If the button ispressed while the note is outside the Perfect area, but within the blue area (the good area), then the buttonpress is given a grade of Good. Finally, if the button is pressed while the note is outside the Perfect and Goodareas, then the button press is a Miss. With the advent of Al, a more friendly rhythm game is now being developed, which takes your performancefrom the previous chart you played and uses it to adjust its Perfect and Good timing windows. This friendlyrhythm game adjusts its Perfect window such that R% of your button presses from the previous played chartwill be considered perfect.Your task is to write a program that would calculate the minimum timing margin n in milliseconds that wouldmake it such that this property holds, given the actual times in milliseconds players pressed thecorresponding button to the notes in a chart.Input FormatThe first line of the input contains a two space-separated integers N and R, which indicates the number ofnotes in the chart and the target accuracy rate.N lines follow, each containing a pair of space-separated integers t; and p₁, where t; is the actual time inmilliseconds from the start of the chart the ith button should be pressed, and p; is the actual time the playerpressed the ith button in milliseconds from the start of the chart.Note that if a button press is graded a "Miss", then it's p; value would be -1.Constraints1 ≤ N≤ 1050≤R≤ 1000 ≤ti, Pi≤ 10¹2 V pi = -1 for all 1 ≤ i ≤ Nti < ti+1 for all 1 < i < N(Pi -1^ Pi+1 # −1) ⇒ Pi < Pi+1 for all 1 < i < N‡

To solve this problem using a greedy algorithm, we can start by sorting the notes by the absolute…

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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Information is present in the screenshot and below. Based on that need help in solving the code for this problem in python. The time complexity has to be as less as possible (nlogn or n at best, no n^2). Apply greedy algorithm to the problem. Make sure both test cases return correct answers.

Output Format

The output consists of a single integer n, which is the minimum margin in milliseconds that would make it such that at least R% of the button presses would be graded as Perfects. If no such margin exists, print "It's impossible!" (without quotes).

Sample Input 0
5 40
5 87
14 -1
22 271
25 628
46 -1

Sample Output 0
249

Explanation 0
A 40% accuracy means that the two most accurate notes must be considered perfect. The error margin of the first note (5, 87) is |87 - 5| = 82 and the error margin of the third note (22, 271) is |271 - 22| = 249. Other notes would have higher margins, and the second and fifth notes are both Misses, therefore the minimum margin such that 40% of the notes may be considered perfect is the error margin of the third note, 249.

Sample Input 1
6 62
11 251
28 261
66 -1
73 -1
80 666
86 929

Sample Output 1
843

Explanation 1
A 62% accuracy means that out of six notes, the four most accurate notes must be considered perfect. Two notes are Misses, the third and fourth notes. This means that the highest error margin among the other four notes will be the minimum error margin such that 62% of the six notes would be considered Perfect. The sixth note has the highest error margin of |929 - 86| = 843.

The actual code

"""
n - number of notes
r - target accuracy date
times contains:
t_i (actual time in ms start of the chart)
p_i (actual time the player pressed the button in ms)
"""
def solve(n,r,times):
# compute for and return answer here

def main():
n, r = list(map(int,input().strip().split(" ")))
times = [list(map(int,input().strip().split(" "))) for i in range(n)]

print(solve(n,r,times))

if __name__ == "__main__":
main()

In 1987, often credited as the first rhythm game PaRappa the Rapper introduced the core mechanic of rhythm
games, repeating a preprogrammed pattern within an allowable amount of time. A decade later, Beatmania
would introduce more modern mechanics, like scoring based on how accurate one's button presses are to the
actual time they need to be pressed, which would become a staple mechanic among all classic rhythm games.
When a note appears on screen in a rhythm game, players would need to press the button that corresponds
to the note at a specific time. This is usually indicated by the note slowly approaching a note bar. The button
press is then graded depending on how close to the bar the note is when the button is pressed, which
corresponds to how many milliseconds the button press is off from perfect timing. If the button press is within
n milliseconds of the note hitting the note bar, where n is a small time limit, the button press is given a
Perfect grade. Suppose it is within m milliseconds, where m is greater than n but is still within an allowable
limit. In that case, the button press is considered Good. Outside of m, then the button press is considered a
miss. This is repeated for all the notes in a chart; a chart corresponds to a level or a song that contains a set of
notes.
Consider the following image:
The white bar is the note bar, while the red rectangle is the note. Imagine this red rectangle has been
approaching the note bar from the top of the screen. The note is currently right on top of the note bar. If the
player presses the button now, it is considered a Perfect. However, it would still be considered a perfect if the
button is pressed while the red rectangle (the note) is within the green area (the Perfect area). If the button is
pressed while the note is outside the Perfect area, but within the blue area (the good area), then the button
press is given a grade of Good. Finally, if the button is pressed while the note is outside the Perfect and Good
areas, then the button press is a Miss.

With the advent of Al, a more friendly rhythm game is now being developed, which takes your performance
from the previous chart you played and uses it to adjust its Perfect and Good timing windows. This friendly
rhythm game adjusts its Perfect window such that R% of your button presses from the previous played chart
will be considered perfect.
Your task is to write a program that would calculate the minimum timing margin n in milliseconds that would
make it such that this property holds, given the actual times in milliseconds players pressed the
corresponding button to the notes in a chart.
Input Format
The first line of the input contains a two space-separated integers N and R, which indicates the number of
notes in the chart and the target accuracy rate.
N lines follow, each containing a pair of space-separated integers t; and p₁, where t; is the actual time in
milliseconds from the start of the chart the ith button should be pressed, and p; is the actual time the player
pressed the ith button in milliseconds from the start of the chart.
Note that if a button press is graded a "Miss", then it's p; value would be -1.
Constraints
1 ≤ N≤ 105
0≤R≤ 100
0 ≤ti, Pi≤ 10¹2 V pi = -1 for all 1 ≤ i ≤ N
ti < ti+1 for all 1 < i < N
(Pi -1^ Pi+1 # −1) ⇒ Pi < Pi+1 for all 1 < i < N
‡

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