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Update infix to postfix #3817

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Merged
realDuYuanChao merged 4 commits into from
Nov 1, 2020
Merged

Update infix to postfix #3817

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71464a4
add test to infix_to_postfix_conversion
realDuYuanChao Oct 29, 2020
226ba28
fixed pre-commit error
realDuYuanChao Oct 29, 2020
6c919f2
fixed build error
realDuYuanChao Oct 29, 2020
41bd5bd
updating DIRECTORY.md
Oct 29, 2020
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fixed build error
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@realDuYuanChao
realDuYuanChao committed Oct 29, 2020
commit 6c919f299e8c710496ef43a86178bfef28701975
22 changes: 0 additions & 22 deletions data_structures/stacks/__init__.py
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Original file line number Diff line number Diff line change
@@ -1,22 +0,0 @@
class Stack:
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def __init__(self):
self.stack = []
self.top = 0

def is_empty(self):
return self.top == 0

def push(self, item):
if self.top < len(self.stack):
self.stack[self.top] = item
else:
self.stack.append(item)

self.top += 1

def pop(self):
if self.is_empty():
return None
else:
self.top -= 1
return self.stack[self.top]
4 changes: 2 additions & 2 deletions data_structures/stacks/infix_to_postfix_conversion.py
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Expand Up @@ -4,8 +4,8 @@
https://en.wikipedia.org/wiki/Shunting-yard_algorithm
"""

from stacks.balanced_parentheses import balanced_parentheses
from stacks.stack import Stack
from .balanced_parentheses import balanced_parentheses
from .stack import Stack


def precedence(char: str) -> int:
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