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Changed implemention to a Stack instead of a List

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This commit is contained in:
acicchetti 2019-02-14 14:02:17 -05:00
parent 53d3bf9794
commit 4ee707c789
2 changed files with 32 additions and 31 deletions
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62
kotlin/bracket-push/src/main/kotlin/BracketPush.kt
View file

@ -1,32 +1,32 @@
class BracketPush {
companion object {
fun isValid(inpString: String): Boolean{
val stack = mutableListOf<Char>()
val realString = inpString.filter {
(it == '{') or
(it == '[') or
(it == '(') or
(it == ')') or
(it == ']') or
(it == '}') }
for (i in realString){
if ((i == '{') or
(i == '[') or
(i == '(')){
stack.add(0, i)
}
else {
val temp = if (stack.size == 0) {'a'} else {stack.removeAt(0)}
when (temp){
'(' -> if (i != ')') return false
'{' -> if (i != '}') return false
'[' -> if (i != ']') return false
else -> return false
}
}
}
return stack.isEmpty()
}
}
import java.util.Stack
class BracketPush {
companion object {
fun isValid(inpString: String): Boolean{
val stack = Stack<Char>()
val realString = inpString.filter {
(it == '{') or
(it == '[') or
(it == '(') or
(it == ')') or
(it == ']') or
(it == '}') }
for (i in realString){
if ((i == '{') or (i == '[') or (i == '(')){
stack.push(i)
}
else {
val temp = if (stack.size == 0) {'a'} else {stack.pop()}
when (temp){
'(' -> if (i != ')') return false
'{' -> if (i != '}') return false
'[' -> if (i != ']') return false
else -> return false
}
}
}
return stack.isEmpty()
}
}
}

1
kotlin/bracket-push/src/test/kotlin/BracketPushTest.kt
View file

@ -23,6 +23,7 @@ class BracketPushTest(val input: String, val expectedOutput: Boolean) {
arrayOf("([{])", false),
arrayOf("[({]})", false),
arrayOf("(((185 + 223.85) * 15) - 543)/2", true),
arrayOf("b(())[]", true),
arrayOf("\\\\left(\\\\begin{array}{cc} \\\\frac{1}{3} & x\\\\\\\\ \\\\mathrm{e}^{x} &... x^2 \\\\end{array}\\\\right)", true)
)
}