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  1. // challenge 303 Easy Ricochet
  2. // https://w...content-available-to-author-only...t.com/r/dailyprogrammer/comments/5vb1wf/20170221_challenge_303_easy_ricochet/
  3.  
  4. package challenge._303_easy
  5. import java.util.*
  6.  
  7. fun readString(): String? {
  8.     val line: String? = readLine()
  9.     if (line == null) return null
  10.     return line.trim()
  11. }
  12.  
  13. fun readWords(): List<String>? {
  14.     val s: String? = readString()
  15.     if (s == null) return null
  16.     val pat: Regex = Regex("\\s+")
  17.     return s.split(pat)
  18. }
  19.  
  20. fun readInts(): List<Int>? {
  21.     val words: List<String>? = readWords()
  22.     if (words == null) return null
  23.     var lst: ArrayList<Int> = ArrayList()
  24.     for (word in words) {
  25.         try {
  26.             var v: Int = word.toInt()
  27.             lst.add(v)
  28.         }
  29.         catch(nfe: NumberFormatException) {
  30.             return null
  31.         }
  32.     }
  33.     return lst
  34. }
  35.  
  36. enum class Corner {
  37.     UR, LR, LL, UL
  38. }
  39.  
  40. data class Result(val corner: Corner, val distance: Int, val bounces: Int, val time: Int)
  41.  
  42. class Game(H: Int, W: Int, V: Int) {
  43.     val H: Int = H + 1
  44.     val W: Int = W + 1
  45.     val V: Int = V
  46.     fun run(): Result {
  47.         var x = 0
  48.         var y = 0
  49.         var dx = 1
  50.         var dy = 1
  51.         var bounces = 0
  52.         var distance = 0
  53.         while (true) {
  54.             var bounced = false
  55.             if (x + dx < 0 || x + dx >= W) {
  56.                 dx = -dx
  57.                 bounced = true
  58.             }
  59.             if (y + dy < 0 || y + dy >= H) {
  60.                 dy = -dy
  61.                 bounced = true
  62.             }
  63.             if (bounced) bounces++
  64.             x += dx
  65.             y += dy
  66.             distance++
  67.             if (x == W-1 && y == H-1) {
  68.                 return Result(Corner.LR, distance, bounces, distance / V)
  69.             } else if (x == W-1 && y == 0) {
  70.                 return Result(Corner.UR, distance, bounces, distance / V)
  71.             } else if (x == 0 && y == H-1) {
  72.                 return Result(Corner.LL, distance, bounces, distance / V)
  73.             } else if (x == 0 && y == 0) {
  74.                 return Result(Corner.UL, distance, bounces, distance / V)
  75.             }
  76.         }
  77.     }
  78. }
  79.  
  80. fun main(args: Array<String>) {
  81.     while (true) {
  82.         val HWV = readInts()
  83.         if (HWV == null || HWV.size == 0) {
  84.             println("done.")
  85.             break
  86.         }
  87.         val H = HWV[0]
  88.         val W = HWV[1]
  89.         val V = HWV[2]
  90.         if (H<1 || W<1 || V<1) {
  91.             println("done.")
  92.             break
  93.         }
  94.         val game = Game(H, W, V)
  95.         val r = game.run()
  96.         println("${r.corner} ${r.bounces} ${r.time}")
  97.     }
  98. }
Success #stdin #stdout 0.1s 4382720KB
comments ()
stdin
copy 
8 3 1
15 4 2
0 0 0
stdout
copy 
LL 9 24
UR 17 30
done.
https://ideone.com/GzdhI0
DailyProgrammer challenge 303 Easy Ricochet
language:
Kotlin (kotlin 1.3.21)
created:
8 years ago
visibility:
public

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