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.

Hard

Return the result of evaluating a given boolean expression, represented as a string.

An expression can either be:

• "t", evaluating to True;
• "f", evaluating to False;
• "!(expr)", evaluating to the logical NOT of the inner expression expr;
• "&(expr1,expr2,...)", evaluating to the logical AND of 2 or more inner expressions expr1, expr2, ...;
• "|(expr1,expr2,...)", evaluating to the logical OR of 2 or more inner expressions expr1, expr2, ...

Example 1:

Input: expression = “!(f)”

Output: true

Example 2:

Input: expression = “|(f,t)”

Output: true

Example 3:

Input: expression = “&(t,f)”

Output: false

Constraints:

• 1 <= expression.length <= 2 * 104
• expression[i] consists of characters in {'(', ')', '&', '|', '!', 't', 'f', ','}.
• expression is a valid expression representing a boolean, as given in the description.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
boolean	parseBoolExpr(String expression)

Methods inherited from class java.lang.Object

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

Constructor Detail

Solution

public Solution()

Method Detail

parseBoolExpr

public boolean parseBoolExpr(String expression)