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reniz-shah 2024-08-08 10:16:15 +05:30
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strings/string_is_valid_number.py
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@ -2,8 +2,6 @@
Solution By: Reniz Shah
Topic: Deterministic Finite Automaton (DFA)
Given a string s, return whether s is a valid number or not
Input: s = -90E3
Output: True
Leetcode link: https://leetcode.com/problems/valid-number/description/
"""
@ -53,100 +51,6 @@ state_machine: dict[State, dict[CharType, State]] = {
State.EXP_NUMBER: {CharType.NUMERIC: State.EXP_NUMBER},
}
from enum import Enum
from typing import Dict
class CharType(Enum):
NUMERIC = "NUMERIC"
SIGN = "SIGN"
EXPONENT = "EXPONENT"
DECIMAL = "DECIMAL"
class State(Enum):
INITIAL = "INITIAL"
SIGNED = "SIGNED"
WHOLE = "WHOLE"
FRACTIONAL = "FRACTIONAL"
FRACTION = "FRACTION"
EXPONENTIAL = "EXPONENTIAL"
EXP_SIGN = "EXP_SIGN"
EXP_NUMBER = "EXP_NUMBER"
state_machine: Dict[State, Dict[CharType, State]] = {
State.INITIAL: {
CharType.NUMERIC: State.WHOLE,
CharType.SIGN: State.SIGNED,
CharType.DECIMAL: State.FRACTIONAL,
},
State.SIGNED: {CharType.NUMERIC: State.WHOLE, CharType.DECIMAL: State.FRACTIONAL},
State.WHOLE: {
CharType.NUMERIC: State.WHOLE,
CharType.DECIMAL: State.FRACTION,
CharType.EXPONENT: State.EXPONENTIAL,
},
State.FRACTIONAL: {CharType.NUMERIC: State.FRACTION},
State.FRACTION: {
CharType.NUMERIC: State.FRACTION,
CharType.EXPONENT: State.EXPONENTIAL,
},
State.EXPONENTIAL: {
CharType.NUMERIC: State.EXP_NUMBER,
CharType.SIGN: State.EXP_SIGN,
},
State.EXP_SIGN: {CharType.NUMERIC: State.EXP_NUMBER},
State.EXP_NUMBER: {CharType.NUMERIC: State.EXP_NUMBER},
}
from enum import Enum
from typing import Dict
class CharType(Enum):
NUMERIC = "NUMERIC"
SIGN = "SIGN"
EXPONENT = "EXPONENT"
DECIMAL = "DECIMAL"
class State(Enum):
INITIAL = "INITIAL"
SIGNED = "SIGNED"
WHOLE = "WHOLE"
FRACTIONAL = "FRACTIONAL"
FRACTION = "FRACTION"
EXPONENTIAL = "EXPONENTIAL"
EXP_SIGN = "EXP_SIGN"
EXP_NUMBER = "EXP_NUMBER"
state_machine: Dict[State, Dict[CharType, State]] = {
State.INITIAL: {
CharType.NUMERIC: State.WHOLE,
CharType.SIGN: State.SIGNED,
CharType.DECIMAL: State.FRACTIONAL,
},
State.SIGNED: {CharType.NUMERIC: State.WHOLE, CharType.DECIMAL: State.FRACTIONAL},
State.WHOLE: {
CharType.NUMERIC: State.WHOLE,
CharType.DECIMAL: State.FRACTION,
CharType.EXPONENT: State.EXPONENTIAL,
},
State.FRACTIONAL: {CharType.NUMERIC: State.FRACTION},
State.FRACTION: {
CharType.NUMERIC: State.FRACTION,
CharType.EXPONENT: State.EXPONENTIAL,
},
State.EXPONENTIAL: {
CharType.NUMERIC: State.EXP_NUMBER,
CharType.SIGN: State.EXP_SIGN,
},
State.EXP_SIGN: {CharType.NUMERIC: State.EXP_NUMBER},
State.EXP_NUMBER: {CharType.NUMERIC: State.EXP_NUMBER},
}
def classify_char(char: str) -> CharType | None:
"""
@ -179,9 +83,6 @@ def classify_char(char: str) -> CharType | None:
>>> classify_char('0')
<CharType.NUMERIC: 'NUMERIC'>
>>> classify_char('01')
'decimal'
>>> classify_char('r')
"""
if len(char) != 1:
return None
@ -199,15 +100,12 @@ def classify_char(char: str) -> CharType | None:
def is_valid_number(number_string: str) -> bool:
"""
This function checks if the input string represents a valid number.
It uses a finite state machine to parse the input string,
transitioning between states based on the character type.
The function returns True if the input string represents a valid number,
and False otherwise.
A valid number is defined as a string that can be parsed into an
integer, decimal, or exponent.
>>> is_valid_number("2")
True
>>> is_valid_number("0089")