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  1. Practice
  2. Algorithms
  3. Implementation
  4. Beautiful Days at the Movies
  5. Discussions

Beautiful Days at the Movies

  • giovannict73 + 3 comments

    Beautiful days using beautiful Swift.....

    import Foundation

let input: [Int] = readLine()!.componentsSeparatedByString(" ").map { Int($0) ?? 0 }
let i: Int = input[0]
let j: Int = input[1]
let k: Int = input[2]

var beautifulDays: Int = 0

for integer in i...j {
    var int2reverse: Int = integer
    var reversedNum: Int = 0
    while int2reverse != 0 {
        reversedNum = reversedNum * 10 + int2reverse % 10
        int2reverse = int2reverse / 10
    }
    let absDiff: Int = max(integer, reversedNum) - min(integer, reversedNum)
    if absDiff % k == 0 {
        beautifulDays += 1
    }
}
print(beautifulDays)
    • jadex1 + 1 comment

      what happen to i and j? im still learnig swift.

      • giovannict73 + 1 comment

        what do you mean ?

        • jadex1 + 1 comment

          I see that i, and j are set by the input string. I also see that beautiful days is an int and set to zero. where I get lost is the for integer in i...j. int2reverse and reversedNum don't look like they get set to me. Where do they get their values from? I don't understand how the input value of i and j get into the for integer in i..j{}

          • giovannict73 + 0 comments

            for item in items {} is how for cycle is intended for Swift. The block {} will be executed items.count times and 'item' variable will assume each value of 'items' per iteration. In my code I used 'integer' as variable. According to that, int2reverse is initialized with 'integer' that is an int value equals to 'i' at first iteration, i+1, ... j in the last iteration.

    • sendsons + 1 comment

      So here does not support Swift 3 yet? I've used componentsSeparated(by:), and get a error :(

      • giovannict73 + 0 comments

        unfortunately Swift 3 here is not supported yet.

    • rafaelkgobara + 0 comments

      Nice solution!

      What do you think about using tuple here?

      let params = readLine()!.components(separatedBy: " ").map{ Int($0)! }
let (i, j, k) = (params[0], params[1], params[2])