def is_breces_sequence_correct(s: str):
"""
checks the correctness of the breces sequence
of parentheses and square brackets () []
>>> is_breces_sequence_correct("(([()]))[]")
True
>>> is_breces_sequence_correct("([)]")
False
>>> is_breces_sequence_correct("(")
False
>>> is_breces_sequence_correct("]")
False
"""
for brace in s:
if brace not in "()[]":
continue
if brace in "([":
stack.push(brace)
else:
assert brace in ")]", "Closing braces expected: " + str(brace)
if stack.is_empty():
return False
left = stack.pop()
assert left in "([", "Opening braces expected: " + str(brace)
if left == "(":
right = ")"
elif left == "[":
right = "]"
if right != brace:
return False
return stack.is_empty()
def is_braces_sequences_correct(s):
"""
Проверяет корректность скобочной последовательности из куглых и квадратных скобок.
>>> is_braces_sequences_correct('(([()]))[]')
True
>>> is_braces_sequences_correct('[(])')
False
>>> is_braces_sequences_correct('(')
False
>>> is_braces_sequences_correct(']')
False
"""
braces = '()[]'
for brace in s:
if brace not in braces:
continue
if brace in '([':
stack.push(brace)
else:
assert brace in ')]', 'Oups! I expect close brace: ' + str(brace)
if stack.is_empty():
return False
left = stack.pop()
assert left in '([', 'Oups! I expect open brace: ' + str(brace)
if left == "(":
right = ")"
if left == "[":
right = "]"
if right != brace:
return False
return stack.is_empty()
def is_braces_sequenct_correct(seq: str) -> bool:
"""
Check correctness of braces sequence in statement
>>> is_braces_sequenct_correct('() (())')
True
>>> is_braces_sequenct_correct('()[()]')
True
>>> is_braces_sequenct_correct(')')
False
>>> is_braces_sequenct_correct('[()')
False
>>> is_braces_sequenct_correct('[()])')
False
"""
correspondent = dict(zip('([{', ')]}'))
for brace in seq:
if brace in '([{':
stack.push(brace)
continue
elif brace in ')]}':
if stack.is_empty():
return False
left = stack.pop()
if correspondent[left] != brace:
return False
return stack.is_empty()
def main(fichier):
s=stack.create()
ind_char=stack.create()
ind_ligne=stack.create()
nb_ligne=0
in_channel = open(fichier, 'r')
chaine="debut"
while(chaine != ''):
chaine=in_channel.readline()
nb_ligne=nb_ligne+1
for i in range(len(chaine)):
if(chaine[i]=="(" or chaine[i]=="[" or chaine[i]=="{") :
stack.push(chaine[i],s)
stack.push(i,ind_char)
stack.push(nb_ligne,ind_ligne)
elif(chaine[i]==")" or chaine[i]=="]" or chaine[i]=="}"):
if(not (stack.is_empty(s))):
if (stack.top(s)==getOpening(chaine[i])):
stack.pop(s)
else:
print("Closed parenthese",chaine[i]," at line ",nb_ligne," char ",i," don't match the open parenthese ",stack.top(s)," at line ",stack.top(ind_ligne)," char ",stack.top(ind_char))
else:
print("No open parenthese matching parenthese ",chaine[i]," at line ",nb_ligne," char ",i)
chaine=in_channel.readline()
if(not stack.is_empty(s)):
print("Parenthese ",stack.top(s)," at line ",stack.top(nb_ligne)," char ",stack.top(nb_char)," has no matching closed parenthese.")
def minimum_bracket_reversals(input_string):
"""
Calculate the number of reversals to fix the brackets
Args:
input_string(string): Strings to be used for bracket reversal calculation
Returns:
int: Number of breacket reversals needed
"""
if len(input_string) % 2 == 1:
return -1
stack = Stack()
count = 0
for bracket in input_string:
if stack.is_empty():
stack.push(bracket)
else:
top = stack.top()
if top != bracket:
if top == "{":
stack.pop()
stack.push(bracket)
while not stack.is_empty():
first = stack.pop()
second = stack.pop()
if first == "}" and second == "}":
count += 1
elif first == '{' and second == '}':
count += 2
elif first == '{' and second == '{':
count += 1
return count
def is_braces_sequence_correct(seq: str) -> bool:
"""
Check correctness of braces sequence in statement
>>> is_braces_sequence_correct("()(())")
True
>>> is_braces_sequence_correct("()[()]")
True
>>> is_braces_sequence_correct(")")
False
>>> is_braces_sequence_correct("[()")
False
>>> is_braces_sequence_correct("[(])")
False
"""
correspondent = dict(zip("([{", ")]}"))
for brace in seq:
if brace in "([{":
stack.push(brace)
continue
elif brace in ")]}":
if stack.is_empty():
return False
left = stack.pop()
if correspondent[left] != brace:
return False
return stack.is_empty()
def is_braces_sequence_correct(s: str):
"""Проверяет является ли корректной скобочная последовательность,
содержащая скобки вида: () [].
>>> is_braces_sequence_correct("(([()]))[]")
True
>>> is_braces_sequence_correct("([)]")
False
>>> is_braces_sequence_correct("(")
False
>>> is_braces_sequence_correct("]")
False
"""
for brace in s:
if brace not in "[]()":
continue
if brace in "[(":
stack.push(brace)
else:
assert brace in ")]", "Ожидалась закрывющая скобка, получена: " + str(
brace)
if stack.is_empty():
return False
left = stack.pop()
assert left in "([" "Ожидалась открывающая скобка, получена: " + str(
brace)
if left == "(":
right = ")"
else:
right = "]"
if brace != right:
return False
return stack.is_empty()
def solve_puzzle(red, green, blue):
"""
Takes in three stacks and then sorts them based on ball color.
First it checks each ball in the red can. If the ball is green it
goes in green, if the ball is red or blue it goes in blue. Then it
looks at the blue can. If the ball is red it goes in the red, if it
is blue it goes in the green. Lastly all the blue balls in the green
can move back to the blue can and the stacks of balls will be sorted.
The function also tracks the amount of moves the sorting process takes
and returns it.
Pre-Conditions: It is assumed that all balls will begin in the red can and
that the green and blue cans are empty.
:param red: Red Can
:param green: Green Can
:param blue: Blue Can
:return: moves
"""
moves = 0
stack_list = [red, green, blue]
while stack.is_empty(red) != True:
top_val = stack.top(red)
if top_val == "R" or top_val == "B":
stack.pop(red)
stack.push(blue, top_val)
animate.animate_move(stack_list, 0, 2)
else:
stack.pop(red)
stack.push(green, top_val)
animate.animate_move(stack_list, 0, 1)
moves += 1
while stack.is_empty(blue) != True:
top_val = stack.top(blue)
if top_val == "R":
stack.pop(blue)
stack.push(red, top_val)
animate.animate_move(stack_list, 2, 0)
else:
stack.pop(blue)
stack.push(green, top_val)
animate.animate_move(stack_list, 2, 1)
moves += 1
while stack.top(green) != "G":
top_val = stack.top(green)
stack.pop(green)
stack.push(blue, top_val)
animate.animate_move(stack_list, 1, 2)
moves += 1
return moves
def ic(x: str):
stack.clear()
if x == '':
return False
for brace in x:
if brace in '()':
if brace in '(':
stack.push(brace)
else:
if stack.is_empty():
return False
left = stack.pop()
if left == '(':
right = ')'
if brace != right:
return False
return stack.is_empty()
def verif_parentheses(chaine):
s=stack.create()
for i in range(len(chaine)):
"""
print(s)
"""
if(chaine[i]=="(" or chaine[i]=="[" or chaine[i]=="{") :
stack.push(chaine[i],s)
elif(chaine[i]==")" or chaine[i]=="]" or chaine[i]=="}"):
if(not (stack.is_empty(s)) and stack.top(s)==getOpening(chaine[i])):
stack.pop(s)
else:
return -1
if(stack.is_empty(s)):
return 1
else:
return 0
def remove(s):
if stack.is_empty(s[0]): # check is there are no states in the stack
if s[3]: # check if there is a reason to search deeper
s[1] += 1 # increase search depth
s[3] = False # meanwhile there is no evidence to need to search deeper
#print(s[1]) # print what level we finished searching
return s[2] # return the initial state
else:
return 0
return stack.remove(s[0]) # if there are items in the stack ...
def stack_list(list, stack):
'''
(list,Stack)--> NoneType
Adds each element of the list to the stack.
Removes the top element from the stack. If the element is a non-list, it prints it. If the element is a list, it stores each of its elements on the stack.
Continue the previous step until the stack is empty. Check for an empty stack, rather than causing an exception to be raised!
'''
for i in list:
stack.push(i)
while not stack.is_empty():
first = stack.pop()
if not isinstance(first, list):
print(first)
else:
stack_list(first, stack)
import stack
string = "Mr Owl Ate My Metal Worm"
reversed_string = ""
#WITH STACK CLASS
stack = stack.Stack()
for char in string:
stack.push(char)
while not stack.is_empty():
reversed_string += stack.pop()
print(reversed_string)
string = "mroW lateM yM etA lwO rM"
reversed_string = ""
# WITHOUT STACK CLASS
for x in range(len(string)):
reversed_string += string[-1]
string = string[0:-1]
print(reversed_string)
new_queue = q.create()
for j in range(0, 3):
val = i * 3 + j
print("Enqueueing value : " + str(val))
q.enqueue(new_queue, val)
print("Pushing the queue containing those past 3 values onto the stack!\n")
s.push(stack, new_queue)
print("\nPopping the stack!\n")
# empty the stack
while not s.is_empty(stack):
print("Popping a queue!")
current_popped_queue = s.pop(stack)
while not q.is_empty(current_popped_queue):
print("De-queued value from popped queue: " +
str(q.dequeue(current_popped_queue)))
print() # Aesthetic
print("***********************************************")
##################################################################################
#
# A stack that pushes stacks! ###################################################
def is_empty(s):
return stack.is_empty(
s[0]) and not s[3] # stack is empty and try next level is false