金声玉亮2.0模型评测报告

问题

Complete the following python code:
from typing import List

def below_zero(operations: List[int]) -> bool:
""" You're given a list of deposit and withdrawal operations on a bank account that starts with
zero balance. Your task is to detect if at any point the balance of account fallls below zero, and
at that point function should return True. Otherwise it should return False.
>>> below_zero([1, 2, 3])
False
>>> below_zero([1, 2, -4, 5])
True
"""

答案

模型	模型答案	测试结果
金声玉亮2.0	To complete the `below_zero` function, you need to iterate through the list of operations, adjust the balance accordingly, and check if the balance falls below zero at any point. If it does, the function should return `True`; otherwise, it should return `False` after processing all operations. Here is the complete code: ```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise it should return False. >>> below_zero([1, 2, 3]) False >>> below_zero([1, 2, -4, 5]) True """ balance = 0 for operation in operations: balance += operation if balance < 0: return True return False # Test cases if __name__ == "__main__": import doctest doctest.testmod() ``` This code defines the `below_zero` function, which initializes the balance to zero and then iterates through each operation, updating the balance and checking if it falls below zero. If the balance goes negative at any point, the function returns `True`. If it completes the loop without the balance falling below zero, the function returns `False`. The included doctest cases can be used to verify the correctness of the function.	passed
deepseekr1	To solve this problem, we need to determine if the balance of a bank account ever falls below zero after a series of deposit and withdrawal operations. The account starts with a zero balance, and we need to check the balance after each operation to see if it becomes negative. ### Approach 1. Initialize Balance: Start with an initial balance of zero. 2. Iterate Through Operations: For each operation in the list, update the balance by adding the operation value. 3. Check Balance: After each update, check if the balance is less than zero. If it is, return `True` immediately as the balance has gone negative. 4. Return Result: If all operations are processed without the balance ever going negative, return `False`. This approach ensures that we efficiently check each operation in sequence, immediately returning if the balance ever becomes negative, thus optimizing the solution to exit early when the condition is met. ### Solution Code ```python from typing import List def below_zero(operations: List[int]) -> bool: balance = 0 for op in operations: balance += op if balance < 0: return True return False ``` ### Explanation - Initialization: The balance is initialized to zero. - Loop Through Operations: For each operation in the list, the balance is updated by adding the operation's value. This handles both deposits (positive values) and withdrawals (negative values). - Check for Negative Balance: After each update, the balance is checked. If it ever becomes negative, the function returns `True` immediately, indicating that the account balance fell below zero at some point. - Final Check: If the loop completes without the balance going negative, the function returns `False`, indicating that the balance never fell below zero during all operations. This solution efficiently processes each operation in linear time, O(n), where n is the number of operations, ensuring optimal performance. The early exit strategy minimizes unnecessary computations once the balance goes negative.	passed
gpto1	```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise it should return False. >>> below_zero([1, 2, 3]) False >>> below_zero([1, 2, -4, 5]) True """ balance = 0 for op in operations: balance += op if balance < 0: return True return False ```	passed
GPT-4o	Sure, I'll complete the function for you. Here's the code: ```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise it should return False. >>> below_zero([1, 2, 3]) False >>> below_zero([1, 2, -4, 5]) True """ balance = 0 for operation in operations: balance += operation if balance < 0: return True return False # Example usage: if __name__ == "__main__": import doctest doctest.testmod() ``` This function iterates through each operation in the list, updating the balance accordingly. If at any point the balance falls below zero, it returns `True`. If the loop completes without the balance falling below zero, it returns `False`. The `doctest` module is used to test the examples provided in the docstring.	passed
llama3.1-70B-Instruct	Here is the completed Python code: ```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise it should return False. >>> below_zero([1, 2, 3]) False >>> below_zero([1, 2, -4, 5]) True """ balance = 0 for operation in operations: balance += operation if balance < 0: return True return False ``` Here's an explanation of the code: 1. We initialize a variable `balance` to 0, which represents the initial balance of the account. 2. We iterate through the list of operations using a `for` loop. 3. For each operation, we add it to the `balance` variable. 4. We check if the `balance` is less than 0 after each operation. If it is, we immediately return `True`, indicating that the balance has fallen below zero. 5. If we reach the end of the loop without returning `True`, it means that the balance never fell below zero, so we return `False`. Example use cases: * `below_zero([1, 2, 3])` returns `False` because the balance never falls below zero. * `below_zero([1, 2, -4, 5])` returns `True` because the balance falls below zero after the third operation.	passed
llama3.1-405B-Instruct	Here is the completed Python code: ```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise it should return False. >>> below_zero([1, 2, 3]) False >>> below_zero([1, 2, -4, 5]) True """ balance = 0 for operation in operations: balance += operation if balance < 0: return True return False ``` This code initializes a `balance` variable to 0, then iterates over each operation in the list. For each operation, it adds the operation to the balance. If the balance ever falls below 0,	passed
DeepSeek-Coder-V2	Here's the completed Python code for the `below_zero` function: ```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise it should return False. >>> below_zero([1, 2, 3]) False >>> below_zero([1, 2, -4, 5]) True """ balance = 0 for operation in operations: balance += operation if balance < 0: return True return False ``` This function iterates through the list of operations, updating the balance accordingly. If at any point the balance falls below zero, it returns `True`. If it completes the iteration without the balance going below zero, it returns `False`.	passed
Qwen2-72B-Instruct	Here is how you can complete this python code: ```python from typing import List def below_zero(operations: List[int]) -> bool: balance = 0 for op in operations: balance += op if balance < 0: return True return False ``` This function goes through each operation in the list, updating the balance. If at any point the balance is below zero, it immediately returns True. If it goes through all the operations without the balance going below zero, it returns False.	passed
baichuan4	To complete the Python code for the `below_zero` function, we need to iterate through the list of operations and keep track of the balance. If at any point the balance falls below zero, we should return `True`. If we complete the iteration without the balance falling below zero, we should return `False`. Here's the completed function: ```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise it should return False. >>> below_zero([1, 2, 3]) False >>> below_zero([1, 2, -4, 5]) True """ # Initialize the balance to 0 balance = 0 # Iterate through the operations for operation in operations: # Update the balance with the current operation balance += operation # Check if the balance is below zero if balance < 0: # Return True if the balance is below zero return True # If we reach here, the balance never fell below zero return False # Example usage: print(below_zero([1, 2, 3])) # Output: False print(below_zero([1, 2, -4, 5])) # Output: True ``` This function starts by setting the initial balance to 0. It then iterates through each operation in the `operations` list, adding each operation amount to the balance. If the balance becomes negative at any point, the function immediately returns `True`. If the loop finishes without the balance becoming negative, the function returns `False`, indicating that the balance never fell below zero.	passed
doubao	Here's the completed Python code: ```python from typing import List def below_zero(operations: List[int]) -> bool: balance = 0 for op in operations: balance += op if balance < 0: return True return False ```	passed
minimax	Here's the completed Python code for the function `below_zero`: ```python from typing import List def below_zero(operations: List[int]) -> bool: balance = 0 for operation in operations: balance += operation if balance < 0: return True return False # Example usage: print(below_zero([1, 2, 3])) # Output: False print(below_zero([1, 2, -4, 5])) # Output: True ``` This function iterates through the list of operations, updating the balance with each operation. If at any point the balance falls below zero, it immediately returns `True`. If the loop completes without the balance going below zero, the function returns `False`.	passed
kimi	Certainly! Here's the completed Python code for the `below_zero` function: ```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise it should return False. >>> below_zero([1, 2, 3]) False >>> below_zero([1, 2, -4, 5]) True """ balance = 0 for operation in operations: balance += operation if balance < 0: return True return False # Example usage: # print(below_zero([1, 2, 3])) # Should return False # print(below_zero([1, 2, -4, 5])) # Should return True ``` This function iterates through the list of operations, updating the balance with each operation. If at any point the balance goes below zero, it returns `True`. If the loop finishes without the balance going below zero, it returns `False`.	passed
wenxinyiyan	Here's the completed Python code for the `below_zero` function: ```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise, it should return False. """ balance = 0 for operation in operations: balance += operation if balance < 0: return True return False ``` In this code, we initialize a variable `balance` to keep track of the account balance, which starts at zero. Then, we iterate over each operation in the `operations` list. For each operation, we update the `balance` by adding the operation amount. After each operation, we check if the `balance` has fallen below zero. If it has, we immediately return `True` since we have detected that the balance fell below zero at some point. If we finish iterating over all the operations without the balance falling below zero, we return `False` to indicate that the balance never fell below zero.	passed
zhipu	Here's the complete Python code for the function `below_zero`: ```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise it should return False. >>> below_zero([1, 2, 3]) False >>> below_zero([1, 2, -4, 5]) True """ balance = 0 for operation in operations: balance += operation if balance < 0: return True return False # Example usage: if __name__ == "__main__": import doctest doctest.testmod() ``` ### Explanation: 1. Function Definition: The function `below_zero` takes a list of integers `operations` as input. 2. Initial Balance: We start with a `balance` variable initialized to 0. 3. Loop Through Operations: We iterate through each operation in the `operations` list. - Update Balance: For each operation, we update the `balance` by adding the current operation value. - Check Balance: If at any point the `balance` falls below zero, we immediately return `True`. 4. Return False: If the loop completes without the balance falling below zero, we return `False`. ### Doctest: - The `if __name__ == "__main__":` block is used to run the doctests when the script is executed directly. - `doctest.testmod()` will check the examples provided in the docstring to ensure the function behaves as expected. This code will correctly determine if the balance ever falls below zero during the sequence of operations.	passed
gpto1	```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise it should return False. >>> below_zero([1, 2, 3]) False >>> below_zero([1, 2, -4, 5]) True """ balance = 0 for op in operations: balance += op if balance < 0: return True return False ```	passed
deepseekv3	To complete the function `below_zero`, we need to iterate through the list of operations, keep track of the account balance, and check if the balance ever falls below zero. Here's the implementation: ```python from typing import List def below_zero(operations: List[int]) -> bool: """ You're given a list of deposit and withdrawal operations on a bank account that starts with zero balance. Your task is to detect if at any point the balance of account falls below zero, and at that point function should return True. Otherwise it should return False. >>> below_zero([1, 2, 3]) False >>> below_zero([1, 2, -4, 5]) True """ balance = 0 for operation in operations: balance += operation if balance < 0: return True return False # Test cases print(below_zero([1, 2, 3])) # Output: False print(below_zero([1, 2, -4, 5])) # Output: True ``` ### Explanation: 1. Initialization: Start with a `balance` of 0. 2. Iteration: Loop through each operation in the list. 3. Update Balance: Add the current operation to the balance. 4. Check Condition: If the balance ever becomes negative, return `True`. 5. Completion: If the loop completes without the balance going negative, return `False`. This function efficiently checks if the account balance ever falls below zero by processing each operation in sequence and immediately returning `True` if the condition is met. If the loop finishes without the balance going negative, it returns `False`.	passed

模型

模型答案

测试结果

金声玉亮2.0

To complete the `below_zero` function, you need to iterate through the list of operations, adjust the balance accordingly, and check if the balance falls below zero at any point. If it does, the function should return `True`; otherwise, it should return `False` after processing all operations.

Here is the complete code:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
""" You're given a list of deposit and withdrawal operations on a bank account that starts with
zero balance. Your task is to detect if at any point the balance of account falls below zero, and
at that point function should return True. Otherwise it should return False.
>>> below_zero([1, 2, 3])
False
>>> below_zero([1, 2, -4, 5])
True
"""
balance = 0
for operation in operations:
balance += operation
if balance < 0:
return True
return False

# Test cases
if __name__ == "__main__":
import doctest
doctest.testmod()
```

This code defines the `below_zero` function, which initializes the balance to zero and then iterates through each operation, updating the balance and checking if it falls below zero. If the balance goes negative at any point, the function returns `True`. If it completes the loop without the balance falling below zero, the function returns `False`.

The included doctest cases can be used to verify the correctness of the function.

passed

deepseekr1

To solve this problem, we need to determine if the balance of a bank account ever falls below zero after a series of deposit and withdrawal operations. The account starts with a zero balance, and we need to check the balance after each operation to see if it becomes negative.

### Approach
1. **Initialize Balance**: Start with an initial balance of zero.
2. **Iterate Through Operations**: For each operation in the list, update the balance by adding the operation value.
3. **Check Balance**: After each update, check if the balance is less than zero. If it is, return `True` immediately as the balance has gone negative.
4. **Return Result**: If all operations are processed without the balance ever going negative, return `False`.

This approach ensures that we efficiently check each operation in sequence, immediately returning if the balance ever becomes negative, thus optimizing the solution to exit early when the condition is met.

### Solution Code
```python
from typing import List

def below_zero(operations: List[int]) -> bool:
balance = 0
for op in operations:
balance += op
if balance < 0:
return True
return False
```

### Explanation
- **Initialization**: The balance is initialized to zero.
- **Loop Through Operations**: For each operation in the list, the balance is updated by adding the operation's value. This handles both deposits (positive values) and withdrawals (negative values).
- **Check for Negative Balance**: After each update, the balance is checked. If it ever becomes negative, the function returns `True` immediately, indicating that the account balance fell below zero at some point.
- **Final Check**: If the loop completes without the balance going negative, the function returns `False`, indicating that the balance never fell below zero during all operations.

This solution efficiently processes each operation in linear time, O(n), where n is the number of operations, ensuring optimal performance. The early exit strategy minimizes unnecessary computations once the balance goes negative.

passed

gpto1

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
""" You're given a list of deposit and withdrawal operations on a bank account that starts with
zero balance. Your task is to detect if at any point the balance of account falls below zero, and
at that point function should return True. Otherwise it should return False.
>>> below_zero([1, 2, 3])
False
>>> below_zero([1, 2, -4, 5])
True
"""
balance = 0
for op in operations:
balance += op
if balance < 0:
return True
return False
```

passed

GPT-4o

Sure, I'll complete the function for you. Here's the code:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
""" You're given a list of deposit and withdrawal operations on a bank account that starts with
zero balance. Your task is to detect if at any point the balance of account falls below zero, and
at that point function should return True. Otherwise it should return False.
>>> below_zero([1, 2, 3])
False
>>> below_zero([1, 2, -4, 5])
True
"""
balance = 0
for operation in operations:
balance += operation
if balance < 0:
return True
return False

# Example usage:
if __name__ == "__main__":
import doctest
doctest.testmod()
```

This function iterates through each operation in the list, updating the balance accordingly. If at any point the balance falls below zero, it returns `True`. If the loop completes without the balance falling below zero, it returns `False`. The `doctest` module is used to test the examples provided in the docstring.

passed

llama3.1-70B-Instruct

Here is the completed Python code:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
""" You're given a list of deposit and withdrawal operations on a bank account that starts with
zero balance. Your task is to detect if at any point the balance of account falls below zero, and
at that point function should return True. Otherwise it should return False.
>>> below_zero([1, 2, 3])
False
>>> below_zero([1, 2, -4, 5])
True
"""
balance = 0
for operation in operations:
balance += operation
if balance < 0:
return True
return False
```

Here's an explanation of the code:

1. We initialize a variable `balance` to 0, which represents the initial balance of the account.
2. We iterate through the list of operations using a `for` loop.
3. For each operation, we add it to the `balance` variable.
4. We check if the `balance` is less than 0 after each operation. If it is, we immediately return `True`, indicating that the balance has fallen below zero.
5. If we reach the end of the loop without returning `True`, it means that the balance never fell below zero, so we return `False`.

Example use cases:

* `below_zero([1, 2, 3])` returns `False` because the balance never falls below zero.
* `below_zero([1, 2, -4, 5])` returns `True` because the balance falls below zero after the third operation.

passed

llama3.1-405B-Instruct

passed

DeepSeek-Coder-V2

Here's the completed Python code for the `below_zero` function:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
""" You're given a list of deposit and withdrawal operations on a bank account that starts with
zero balance. Your task is to detect if at any point the balance of account falls below zero, and
at that point function should return True. Otherwise it should return False.
>>> below_zero([1, 2, 3])
False
>>> below_zero([1, 2, -4, 5])
True
"""
balance = 0
for operation in operations:
balance += operation
if balance < 0:
return True
return False
```

This function iterates through the list of operations, updating the balance accordingly. If at any point the balance falls below zero, it returns `True`. If it completes the iteration without the balance going below zero, it returns `False`.

passed

Qwen2-72B-Instruct

Here is how you can complete this python code:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
balance = 0
for op in operations:
balance += op
if balance < 0:
return True
return False
```

This function goes through each operation in the list, updating the balance. If at any point the balance is below zero, it immediately returns True. If it goes through all the operations without the balance going below zero, it returns False.

passed

baichuan4

To complete the Python code for the `below_zero` function, we need to iterate through the list of operations and keep track of the balance. If at any point the balance falls below zero, we should return `True`. If we complete the iteration without the balance falling below zero, we should return `False`. Here's the completed function:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
""" You're given a list of deposit and withdrawal operations on a bank account that starts with
zero balance. Your task is to detect if at any point the balance of account falls below zero, and
at that point function should return True. Otherwise it should return False.
>>> below_zero([1, 2, 3])
False
>>> below_zero([1, 2, -4, 5])
True
"""
# Initialize the balance to 0
balance = 0

# Iterate through the operations
for operation in operations:
# Update the balance with the current operation
balance += operation

# Check if the balance is below zero
if balance < 0:
# Return True if the balance is below zero
return True

# If we reach here, the balance never fell below zero
return False

# Example usage:
print(below_zero([1, 2, 3])) # Output: False
print(below_zero([1, 2, -4, 5])) # Output: True
```

This function starts by setting the initial balance to 0. It then iterates through each operation in the `operations` list, adding each operation amount to the balance. If the balance becomes negative at any point, the function immediately returns `True`. If the loop finishes without the balance becoming negative, the function returns `False`, indicating that the balance never fell below zero.

passed

doubao

Here's the completed Python code:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
balance = 0
for op in operations:
balance += op
if balance < 0:
return True
return False
```

passed

minimax

Here's the completed Python code for the function `below_zero`:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
balance = 0
for operation in operations:
balance += operation
if balance < 0:
return True
return False

# Example usage:
print(below_zero([1, 2, 3])) # Output: False
print(below_zero([1, 2, -4, 5])) # Output: True
```

This function iterates through the list of operations, updating the balance with each operation. If at any point the balance falls below zero, it immediately returns `True`. If the loop completes without the balance going below zero, the function returns `False`.

passed

kimi

Certainly! Here's the completed Python code for the `below_zero` function:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
""" You're given a list of deposit and withdrawal operations on a bank account that starts with
zero balance. Your task is to detect if at any point the balance of account falls below zero, and
at that point function should return True. Otherwise it should return False.
>>> below_zero([1, 2, 3])
False
>>> below_zero([1, 2, -4, 5])
True
"""
balance = 0
for operation in operations:
balance += operation
if balance < 0:
return True
return False

# Example usage:
# print(below_zero([1, 2, 3])) # Should return False
# print(below_zero([1, 2, -4, 5])) # Should return True
```

This function iterates through the list of operations, updating the balance with each operation. If at any point the balance goes below zero, it returns `True`. If the loop finishes without the balance going below zero, it returns `False`.

passed

wenxinyiyan

Here's the completed Python code for the `below_zero` function:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
""" You're given a list of deposit and withdrawal operations on a bank account that starts with
zero balance. Your task is to detect if at any point the balance of account falls below zero, and
at that point function should return True. Otherwise, it should return False.
"""
balance = 0
for operation in operations:
balance += operation
if balance < 0:
return True
return False
```
In this code, we initialize a variable `balance` to keep track of the account balance, which starts at zero. Then, we iterate over each operation in the `operations` list. For each operation, we update the `balance` by adding the operation amount. After each operation, we check if the `balance` has fallen below zero. If it has, we immediately return `True` since we have detected that the balance fell below zero at some point. If we finish iterating over all the operations without the balance falling below zero, we return `False` to indicate that the balance never fell below zero.

passed

zhipu

Here's the complete Python code for the function `below_zero`:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
"""
You're given a list of deposit and withdrawal operations on a bank account that starts with
zero balance. Your task is to detect if at any point the balance of account falls below zero, and
at that point function should return True. Otherwise it should return False.

>>> below_zero([1, 2, 3])
False
>>> below_zero([1, 2, -4, 5])
True
"""
balance = 0
for operation in operations:
balance += operation
if balance < 0:
return True
return False

# Example usage:
if __name__ == "__main__":
import doctest
doctest.testmod()
```

### Explanation:
1. **Function Definition**: The function `below_zero` takes a list of integers `operations` as input.
2. **Initial Balance**: We start with a `balance` variable initialized to 0.
3. **Loop Through Operations**: We iterate through each operation in the `operations` list.
- **Update Balance**: For each operation, we update the `balance` by adding the current operation value.
- **Check Balance**: If at any point the `balance` falls below zero, we immediately return `True`.
4. **Return False**: If the loop completes without the balance falling below zero, we return `False`.

### Doctest:
- The `if __name__ == "__main__":` block is used to run the doctests when the script is executed directly.
- `doctest.testmod()` will check the examples provided in the docstring to ensure the function behaves as expected.

This code will correctly determine if the balance ever falls below zero during the sequence of operations.

passed

gpto1

passed

deepseekv3

To complete the function `below_zero`, we need to iterate through the list of operations, keep track of the account balance, and check if the balance ever falls below zero. Here's the implementation:

```python
from typing import List

def below_zero(operations: List[int]) -> bool:
"""
You're given a list of deposit and withdrawal operations on a bank account that starts with
zero balance. Your task is to detect if at any point the balance of account falls below zero, and
at that point function should return True. Otherwise it should return False.

>>> below_zero([1, 2, 3])
False
>>> below_zero([1, 2, -4, 5])
True
"""
balance = 0
for operation in operations:
balance += operation
if balance < 0:
return True
return False

# Test cases
print(below_zero([1, 2, 3])) # Output: False
print(below_zero([1, 2, -4, 5])) # Output: True
```

### Explanation:
1. **Initialization**: Start with a `balance` of 0.
2. **Iteration**: Loop through each operation in the list.
3. **Update Balance**: Add the current operation to the balance.
4. **Check Condition**: If the balance ever becomes negative, return `True`.
5. **Completion**: If the loop completes without the balance going negative, return `False`.

This function efficiently checks if the account balance ever falls below zero by processing each operation in sequence and immediately returning `True` if the condition is met. If the loop finishes without the balance going negative, it returns `False`.

passed