Tasks Details
elementary
1.
ParkingBill
Given two strings representing times of entry and exit from a car parking lot, find the cost of the ticket according to the given billing rules.
Task Score
100%
Correctness
100%
Performance
Not assessed
You parked your car in a parking lot and want to compute the total cost of the ticket. The billing rules are as follows:
- The entrance fee of the car parking lot is 2;
- The first full or partial hour costs 3;
- Each successive full or partial hour (after the first) costs 4.
You entered the car parking lot at time E and left at time L. In this task, times are represented as strings in the format "HH:MM" (where "HH" is a two-digit number between 0 and 23, which stands for hours, and "MM" is a two-digit number between 0 and 59, which stands for minutes).
Write a function:
class Solution { public int solution(String E, String L); }
that, given strings E and L specifying points in time in the format "HH:MM", returns the total cost of the parking bill from your entry at time E to your exit at time L. You can assume that E describes a time before L on the same day.
For example, given "10:00" and "13:21" your function should return 17, because the entrance fee equals 2, the first hour costs 3 and there are two more full hours and part of a further hour, so the total cost is 2 + 3 + (3 * 4) = 17. Given "09:42" and "11:42" your function should return 9, because the entrance fee equals 2, the first hour costs 3 and the second hour costs 4, so the total cost is 2 + 3 + 4 = 9.
Assume that:
- strings E and L follow the format "HH:MM" strictly;
- string E describes a time before L on the same day.
In your solution, focus on correctness. The performance of your solution will not be the focus of the assessment.
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
Solution
Programming language used Java 21
Time spent on task 28 minutes
Notes
not defined yet
Code: 15:12:31 UTC,
java,
autosave
Code: 15:22:31 UTC,
swift4,
autosave
import Foundation
import Glibc
// you can write to stdout for debugging purposes, e.g.
// print("this is a debug message")
public func solution(_ E : inout String, _ L : inout String) -> Int {
let e = E.components(separatedBy: ":").map({ Int($0)! })
let l = L.components(separatedBy: ":").map({ Int($0)! })
return 2 + 3 + (l[0] - e[0] - 1) * 4 + (l[1] > 0 ? 4 : 0)
}
Code: 15:22:59 UTC,
swift4,
verify,
result: Failed
import Foundation
import Glibc
// you can write to stdout for debugging purposes, e.g.
// print("this is a debug message")
public func solution(_ E : inout String, _ L : inout String) -> Int {
let e = E.components(separatedBy: ":").map({ Int($0)! })
let l = L.components(separatedBy: ":").map({ Int($0)! })
return 2 + 3 + (l[0] - e[0] - 1) * 4 + (l[1] > 0 ? 4 : 0)
}
Analysis
Code: 15:23:55 UTC,
swift4,
verify,
result: Failed
import Foundation
import Glibc
// you can write to stdout for debugging purposes, e.g.
// print("this is a debug message")
public func solution(_ E : inout String, _ L : inout String) -> Int {
let e = E.components(separatedBy: ":").map({ Int($0)! })
let l = L.components(separatedBy: ":").map({ Int($0)! })
return 2 + 3 + (l[0] - e[0] - 1) * 4 + (l[1] > 0 ? 4 : 0)
}
Analysis
Code: 15:40:07 UTC,
swift4,
autosave
import Foundation
import Glibc
// you can write to stdout for debugging purposes, e.g.
// print("this is a debug message")
public func solution(_ E : inout String, _ L : inout String) -> Int {
let e = E.components(separatedBy: ":").map({ Int($0)! })
let l = L.components(separatedBy: ":").map({ Int($0)! })
let startHour = e[0]
let startMinute = e[1]
let endHour = l[0]
let endMinute = l[1]
var time = 0
if startHour < endHour {
if startMinute > 0 {
time += 60 - startMinute
} else {
time += 60
}
time += (endHour - startHour - 1) * 60 + endMinute
} else {
time += endMinute
}
if time == 0 {
return 2
} else if time <= 60 {
return 5
} else {
return 2 + 3 + ((time - 60) / 60) * 4 + (time % 60 > 0 ? 4 : 0)
}
}
Code: 15:40:07 UTC,
swift4,
verify,
result: Passed
import Foundation
import Glibc
// you can write to stdout for debugging purposes, e.g.
// print("this is a debug message")
public func solution(_ E : inout String, _ L : inout String) -> Int {
let e = E.components(separatedBy: ":").map({ Int($0)! })
let l = L.components(separatedBy: ":").map({ Int($0)! })
let startHour = e[0]
let startMinute = e[1]
let endHour = l[0]
let endMinute = l[1]
var time = 0
if startHour < endHour {
if startMinute > 0 {
time += 60 - startMinute
} else {
time += 60
}
time += (endHour - startHour - 1) * 60 + endMinute
} else {
time += endMinute
}
if time == 0 {
return 2
} else if time <= 60 {
return 5
} else {
return 2 + 3 + ((time - 60) / 60) * 4 + (time % 60 > 0 ? 4 : 0)
}
}
Analysis
Code: 15:40:15 UTC,
swift4,
verify,
result: Passed
import Foundation
import Glibc
// you can write to stdout for debugging purposes, e.g.
// print("this is a debug message")
public func solution(_ E : inout String, _ L : inout String) -> Int {
let e = E.components(separatedBy: ":").map({ Int($0)! })
let l = L.components(separatedBy: ":").map({ Int($0)! })
let startHour = e[0]
let startMinute = e[1]
let endHour = l[0]
let endMinute = l[1]
var time = 0
if startHour < endHour {
if startMinute > 0 {
time += 60 - startMinute
} else {
time += 60
}
time += (endHour - startHour - 1) * 60 + endMinute
} else {
time += endMinute
}
if time == 0 {
return 2
} else if time <= 60 {
return 5
} else {
return 2 + 3 + ((time - 60) / 60) * 4 + (time % 60 > 0 ? 4 : 0)
}
}
Analysis
Code: 15:40:21 UTC,
swift4,
final,
score:
100
import Foundation
import Glibc
// you can write to stdout for debugging purposes, e.g.
// print("this is a debug message")
public func solution(_ E : inout String, _ L : inout String) -> Int {
let e = E.components(separatedBy: ":").map({ Int($0)! })
let l = L.components(separatedBy: ":").map({ Int($0)! })
let startHour = e[0]
let startMinute = e[1]
let endHour = l[0]
let endMinute = l[1]
var time = 0
if startHour < endHour {
if startMinute > 0 {
time += 60 - startMinute
} else {
time += 60
}
time += (endHour - startHour - 1) * 60 + endMinute
} else {
time += endMinute
}
if time == 0 {
return 2
} else if time <= 60 {
return 5
} else {
return 2 + 3 + ((time - 60) / 60) * 4 + (time % 60 > 0 ? 4 : 0)
}
}Analysis summary
The solution obtained perfect score.
Analysis
expand all
Correctness tests
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0.008 s
OK
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0.008 s
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2.
0.008 s
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3.
0.008 s
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3.
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0.008 s
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2.
0.008 s
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0.008 s
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0.008 s
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2.
0.008 s
OK
3.
0.008 s
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1.
0.008 s
OK
2.
0.008 s
OK
3.
0.008 s
OK