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DIY: Valid Parenthesis String

Sumit Rawal answered on September 8, 2023 Popularity 5/10 Helpfulness 1/10

answer DIY: Valid Parenthesis String

DIY: Valid Parenthesis String

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object ValidParenthesisString {
  def main(args: Array[String]): Unit = {
    val input = "(*))"
    val isValid = checkValidString(input)
    
    if (isValid)
      println(s"$input is a valid parenthesis string.")
    else
      println(s"$input is not a valid parenthesis string.")
  }

  def checkValidString(s: String): Boolean = {
    var low = 0 // Minimum possible open parentheses count.
    var high = 0 // Maximum possible open parentheses count.

    for (char <- s) {
      // Lower bound can be decreased by '*', but not below 0.
      if (char == '(') {
        low += 1
        high += 1
      } else if (char == ')') {
        low = Math.max(low - 1, 0)
        high -= 1
      } else { // Asterisk '*'
        low = Math.max(low - 1, 0) // Treat '*' as '('.
        high += 1 // Treat '*' as ')'.
      }

      // If at any point high goes negative, it means too many ')' characters.
      if (high < 0) return false
    }

    // The string is valid if and only if low is 0.
    low == 0
  }
}

Popularity 5/10 Helpfulness 1/10 Language scala

Source: chat.openai.com

Tags: scala string

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Contributed on Sep 08 2023

Sumit Rawal

0 Answers Avg Quality 2/10

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