stack_using_two_queues #10002
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stack_using_two_queues #10002
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algorithms-keeper
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added
tests are failing
This was referenced Oct 8, 2023
cclauss
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Oct 8, 2023
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| """ Implementing stack using two arrays""" | ||
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| class Stack(Generic[T]): # Stack class to implement stack operations |
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Suggested change
| """ Implementing stack using two arrays""" | |
| class Stack(Generic[T]): # Stack class to implement stack operations | |
| class Stack(Generic[T]): | |
| """ Implement a stack using two queues""" | |
| class Stack(Generic[T]): # Stack class to implement stack operations | ||
| def __init__(self) -> None: | ||
| self.insert_queue = deque() # First Queue to be used for inserting | ||
| self.suffle_queue = deque() # Second Queue to be used for suffling |
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OPTIONAL: Should Stack be a dataclass?
| self.suffle_queue = deque() # Second Queue to be used for suffling | ||
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| def push(self, item: int) -> None: | ||
| self.insert_queue.append(item) # Add items into the Queue |
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The code already says what the comment repeats.
Suggested change
| self.insert_queue.append(item) # Add items into the Queue | |
| self.insert_queue.append(item) |
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| self.insert_queue.append( | ||
| self.suffle_queue.popleft() | ||
| ) # Popping the elements |
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Let's not wrap lines just to make room for a comment.
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| self.insert_queue.append( | |
| self.suffle_queue.popleft() | |
| ) # Popping the elements | |
| # Popping the elements | |
| self.insert_queue.append(self.suffle_queue.popleft()) |
| self.insert_queue, self.suffle_queue = self.suffle_queue, self.insert_queue | ||
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| def pop(self) -> int: | ||
| if not (self.suffle_queue): # if the stack is empty |
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| if not (self.suffle_queue): # if the stack is empty | |
| if not self.suffle_queue: # if the stack is empty |
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| def printing(self) -> None: | ||
| print(self.suffle_queue) | ||
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| def size(self) -> int: | ||
| return len(self.suffle_queue) |
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These magic methods will allow us to just print(stack) and len(stack).
Suggested change
| def printing(self) -> None: | |
| print(self.suffle_queue) | |
| def size(self) -> int: | |
| return len(self.suffle_queue) | |
| def __str__(self) -> str: | |
| return tuple(self.suffle_queue) | |
| def __len__(self) -> int: | |
| return len(self.suffle_queue) |
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| def test_stack() -> None: | ||
| s = Stack() # Creating a stack in S |
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Single-letter variable names makes code look like it was written in the 1970's.
Suggested change
| s = Stack() # Creating a stack in S | |
| stack = Stack() # Create a empty stack |
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Fixed in data_structures/stacks/stack_using_two_queues.py |
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Describe your change:
Added the code for the implementation of stack using two queues
Fixes:#9987
Checklist: