Package g1101_1200.s1106_parsing_a_boolean_expression

Class Solution

java.lang.Object

g1101_1200.s1106_parsing_a_boolean_expression.Solution

public class Solution
extends Object

1106 - Parsing A Boolean Expression.<p>Hard</p> <p>Return the result of evaluating a given boolean <code>expression</code>, represented as a string.</p> <p>An expression can either be:</p> <ul> <li><code>&quot;t&quot;</code>, evaluating to <code>True</code>;</li> <li><code>&quot;f&quot;</code>, evaluating to <code>False</code>;</li> <li><code>&quot;!(expr)&quot;</code>, evaluating to the logical NOT of the inner expression <code>expr</code>;</li> <li><code>&quot;&(expr1,expr2,...)&quot;</code>, evaluating to the logical AND of 2 or more inner expressions <code>expr1, expr2, ...</code>;</li> <li><code>&quot;|(expr1,expr2,...)&quot;</code>, evaluating to the logical OR of 2 or more inner expressions <code>expr1, expr2, ...</code></li> </ul> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> expression = &ldquo;!(f)&rdquo;</p> <p><strong>Output:</strong> true</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> expression = &ldquo;|(f,t)&rdquo;</p> <p><strong>Output:</strong> true</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> expression = &ldquo;&(t,f)&rdquo;</p> <p><strong>Output:</strong> false</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= expression.length <= 2 * 10⁴</code></li> <li><code>expression[i]</code> consists of characters in <code>{'(', ')', '&', '|', '!', 't', 'f', ','}</code>.</li> <li><code>expression</code> is a valid expression representing a boolean, as given in the description.</li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
boolean	parseBoolExpr(String expression)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

parseBoolExpr

public boolean parseBoolExpr(String expression)