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  1. import java.util.Stack
  2. import java.util.StringTokenizer
  3.  
  4. fun main() {
  5.     val br = System.`in`.bufferedReader()
  6.     val left = Stack<Char>()
  7.     val right = Stack<Char>()
  8.     val str = br.readLine()
  9.     for (c in str) {
  10.     	left.push(c)
  11.     }
  12.     val m = br.readLine().toInt()
  13.  
  14.     repeat(m) {
  15.         val token = StringTokenizer(br.readLine())
  16.         when (token.nextToken().first()) {
  17.             'L' -> {
  18.                 if (left.isNotEmpty()) {
  19.                     right.push(left.pop())
  20.                 }
  21.             }
  22.             'D' -> {
  23.                 if (right.isNotEmpty()) {
  24.                     left.push(right.pop())
  25.                 }
  26.             }
  27.             'B' -> {
  28.                 if (left.isNotEmpty()) {
  29.                     left.pop()
  30.                 }
  31.             }
  32.             'P' -> {
  33.                 left.push(token.nextToken().first()) 
  34.             }
  35.         }
  36.  
  37.         println("left: $left")
  38.         println("right: $right")
  39.     }
  40.  
  41.     val sb = StringBuilder()
  42.     while (left.isNotEmpty()) {
  43.     	sb.append(left.pop())
  44.     }
  45.     while (right.isNotEmpty()) {
  46.     	sb.append(right.pop())
  47.     }
  48.     println(sb)
  49. }
Success #stdin #stdout 0.09s 40996KB
comments (?)
stdin
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abc
9
L
L
L
L
L
P x
L
B
P y
stdout
copy 
left: [a, b]
right: [c]
left: [a]
right: [c, b]
left: []
right: [c, b, a]
left: []
right: [c, b, a]
left: []
right: [c, b, a]
left: [x]
right: [c, b, a]
left: []
right: [c, b, a, x]
left: []
right: [c, b, a, x]
left: [y]
right: [c, b, a, x]
yxabc
https://ideone.com/vuvIgr
language:
Kotlin (kotlin 1.3.21)
created:
4 days ago
visibility:
public

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