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문제02_1874_스택_수열.kt
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문제02_1874_스택_수열.kt
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package ryute.topic01.sub04
import java.io.BufferedWriter
import java.io.OutputStreamWriter
import java.util.*
private fun main() {
solution01()
}
/*** 정답 코드 ***/
private fun solution01() {
val bw = BufferedWriter(OutputStreamWriter(System.out))
val sb = StringBuilder()
val n = readLine()!!.toInt()
val s = Stack<Int>()
var lastStacked = 0
for(i in 1..n) {
val target = readLine()!!.toInt()
if (target > lastStacked) {
for (item in (lastStacked + 1)..target) {
s.push(item)
sb.append("+\n")
}
lastStacked = target
s.pop()
sb.append("-\n")
} else {
if(s.pop() == target) {
sb.append("-\n")
} else {
sb.clear()
sb.append("NO")
break
}
}
}
bw.write(sb.toString())
bw.flush()
bw.close()
}