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import Sign.AND | |
import Sign.OR | |
import java.util.* | |
val keyWords = arrayOf('(', ')', '!', '&', '|') | |
fun main(args: Array<String>) { | |
val expressionSource = Scanner(System.`in`).next() | |
class Expression(var isNegative: Boolean) { | |
val nameBuilder = StringBuilder() | |
val name get() = nameBuilder.toString() | |
val subExpressions = mutableListOf<Expression>() | |
val signs = mutableListOf<Sign>() | |
var value = false | |
fun eval(): Boolean = if (name.isNotEmpty()) { | |
value | |
} else { | |
val expressionsQueue: Queue<Expression> = subExpressions.mapTo(ArrayDeque(mutableListOf())) { it } | |
var currentResult = expressionsQueue.remove().eval() | |
signs.forEach { sign -> | |
currentResult = when (sign) { | |
OR -> currentResult or expressionsQueue.remove().eval() | |
AND -> currentResult and expressionsQueue.remove().eval() | |
} | |
} | |
if (isNegative) | |
!currentResult | |
else | |
currentResult | |
} | |
override fun toString(): String = (if (isNegative) "!" else "") + if (name.isNotEmpty()) { | |
name | |
} else { | |
val expressionsQueue: Queue<Expression> = subExpressions.mapTo(ArrayDeque(mutableListOf())) { it } | |
val builder = StringBuilder("(") | |
builder.append(expressionsQueue.remove()) | |
signs.forEach { sign -> | |
builder.append(sign.toString()) | |
builder.append(expressionsQueue.remove()) | |
} | |
builder.append(")") | |
builder.toString() | |
} | |
} | |
val expressionsStack = Stack<Expression>() | |
expressionsStack.push(Expression(isNegative = false)) | |
fun currentExpression() = expressionsStack.last() | |
val variables = mutableMapOf<String, Expression>() | |
var isNextExpressionWillBeNegative = false | |
expressionSource.forEach { char -> | |
fun open() { | |
expressionsStack.push(Expression(isNextExpressionWillBeNegative)) | |
isNextExpressionWillBeNegative = false | |
} | |
if (char in keyWords) { | |
if (currentExpression().nameBuilder.isNotEmpty()) { | |
val terminatedExpression = expressionsStack.pop() | |
if (terminatedExpression.name !in variables) { | |
variables[terminatedExpression.name] = terminatedExpression | |
} | |
val variable = variables[terminatedExpression.name]!! | |
if (terminatedExpression.isNegative) { | |
terminatedExpression.isNegative = false | |
val negativeExpression = Expression(isNegative = true) | |
negativeExpression.subExpressions.add(variable) | |
currentExpression().subExpressions.add(negativeExpression) | |
} else { | |
currentExpression().subExpressions.add(variable) | |
} | |
} | |
when (char) { | |
'(' -> open() | |
')' -> { | |
val terminatedExpression = expressionsStack.pop() | |
currentExpression().subExpressions.add(terminatedExpression) | |
} | |
'!' -> isNextExpressionWillBeNegative = true | |
'&' -> currentExpression().signs.add(AND) | |
'|' -> currentExpression().signs.add(OR) | |
} | |
} else { | |
if (currentExpression().nameBuilder.isEmpty()) { | |
open() | |
} | |
currentExpression().nameBuilder.append(char) | |
} | |
} | |
val expression = expressionsStack.pop() | |
var isAnswerFound = false | |
fun setValuesOrPrint(variablesTail: List<Expression>) { | |
if (isAnswerFound) return | |
if (variablesTail.isEmpty()) { | |
val result = expression.eval() | |
if (result) { | |
variables.values.forEach { variable -> | |
println("${variable.name} = ${variable.value}") | |
} | |
isAnswerFound = true | |
} | |
} else { | |
variablesTail.first().value = false | |
setValuesOrPrint(variablesTail.drop(1)) | |
variablesTail.first().value = true | |
setValuesOrPrint(variablesTail.drop(1)) | |
} | |
} | |
setValuesOrPrint(variables.values.toList()) | |
if (!isAnswerFound) { | |
println("OMG") | |
} | |
} | |
enum class Sign { | |
OR, AND; | |
override fun toString() = when (this) { | |
OR -> "|" | |
AND -> "&" | |
} | |
} |
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