问题

Complete the following python code:
from typing import List


def separate_paren_groups(paren_string: str) -> List[str]:
""" Input to this function is a string containing multiple groups of nested parentheses. Your goal is to
separate those group into separate strings and return the list of those.
Separate groups are balanced (each open brace is properly closed) and not nested within each other
Ignore any spaces in the input string.
>>> separate_paren_groups('( ) (( )) (( )( ))')
['()', '(())', '(()())']
"""

答案

模型 模型答案 测试结果
金声玉亮2.0 Certainly! Here is a complete implementation of the `separate_paren_groups` function:

```python
from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
"""
Input to this function is a string containing multiple groups of nested parentheses.
Your goal is to separate those groups into separate strings and return the list of those.
Separate groups are balanced (each open brace is properly closed) and not nested within each other.
Ignore any spaces in the input string.

>>> separate_paren_groups('( ) (( )) (( )( ))')
['()', '(())', '(()())']
"""
# Remove spaces from the input string
paren_string = paren_string.replace(" ", "")

result = []
balance = 0
start = 0

for i, char in enumerate(paren_string):
if char == '(':
if balance == 0:
start = i
balance += 1
elif char == ')':
balance -= 1
if balance == 0:
result.append(paren_string[start:i+1])

return result

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

This implementation removes any spaces from the input string and then iterates through the string to identify and extract balanced parenthesis groups. The `balance` variable keeps track of the nesting level of parentheses, and the `start` variable marks the beginning of a new group when the balance is zero. When `balance` returns to zero, a complete group is found and added to the result list.

You can run this code to test it with the provided test case or add more test cases to verify its correctness.
passed
deepseekr1

To solve this problem, we need to separate a string containing multiple groups of nested parentheses into individual balanced groups. Each group should be balanced (each opening parenthesis has a corresponding closing parenthesis) and not nested within another group. We also need to ignore any spaces in the input string.

### Approach
1. **Clean the Input String**: Remove all spaces from the input string to focus only on the parentheses.
2. **Track Balance of Parentheses**: Use a balance counter to keep track of the number of open parentheses that have not been closed yet. This helps in identifying when a group starts and ends.
3. **Identify Groups**: Iterate through the cleaned string. Each time the balance counter returns to zero after closing a parenthesis, it indicates the end of a balanced group. Capture this group and reset the start index for the next group.

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

def separate_paren_groups(paren_string: str) -> List[str]:
cleaned = paren_string.replace(" ", "")
result = []
current_start = 0
balance = 0
for i, char in enumerate(cleaned):
if char == '(':
if balance == 0:
current_start = i
balance += 1
else:
balance -= 1
if balance == 0:
result.append(cleaned[current_start:i+1])
return result
```

### Explanation
1. **Cleaning the Input**: The input string is processed to remove all spaces, resulting in a string that contains only parentheses.
2. **Tracking Balance**: As we iterate through the cleaned string, we maintain a balance counter. This counter increments on encountering an opening parenthesis '(' and decrements on encountering a closing parenthesis ')'.
3. **Capturing Groups**: Whenever the balance counter returns to zero, it signifies the end of a balanced group. The substring from the start index (where the group began) to the current index (inclusive) is added to the result list. This process continues until all characters are processed, ensuring all top-level groups are captured.

This approach efficiently splits the input into balanced groups using a single pass through the string, resulting in an optimal solution with linear time complexity.
passed
gpto1 Certainly! Here's the complete Python function that fulfills the requirements as stated in the docstring:

```python
from typing import List


def separate_paren_groups(paren_string: str) -> List[str]:
""" Input to this function is a string containing multiple groups of nested parentheses. Your goal is to
separate those group into separate strings and return the list of those.
Separate groups are balanced (each open brace is properly closed) and not nested within each other
Ignore any spaces in the input string.
>>> separate_paren_groups('( ) (( )) (( )( ))')
['()', '(())', '(()())']
"""
# Remove spaces from the input string
paren_string = paren_string.replace(' ', '')
groups = []
idx = 0
n = len(paren_string)
while idx < n:
if paren_string[idx] == '(':
start_idx = idx
balance = 0
while idx < n:
if paren_string[idx] == '(':
balance += 1
elif paren_string[idx] == ')':
balance -= 1
idx += 1
if balance == 0:
break
group = paren_string[start_idx:idx]
groups.append(group)
else:
idx += 1 # Move to the next character if current is not '('
return groups
```

**Explanation:**

- **Remove Spaces**: We start by removing all spaces from the input string using `paren_string.replace(' ', '')` to ensure we're only dealing with parentheses.

- **Initialize Variables**: We set up an empty list `groups` to store the separated groups, and variables `idx` to traverse the string and `n` for the string length.

- **Main Loop**: We iterate through `paren_string` using `while idx < n:`. Whenever we encounter an opening parenthesis `'('`, we:

- Set `start_idx` to the current index to remember where this group starts.
- Initialize `balance = 0` to keep track of the balance between opening and closing parentheses.
- Enter a nested `while` loop to process the current group.
- Increase `balance` by 1 for every `'('` and decrease by 1 for every `')'`.
- Move `idx` forward.
- Break the loop when `balance` returns to 0, meaning we've found a complete, balanced group.
- Extract the group using slicing `paren_string[start_idx:idx]` and append it to `groups`.

- **Skip Non-parenthesis Characters**: If the current character is not `'('`, we simply increment `idx` to move to the next character.

**Example Usage:**

```python
print(separate_paren_groups('( ) (( )) (( )( ))'))
# Output: ['()', '(())', '(()())']
```

This function should work correctly for any input string that satisfies the conditions specified in the docstring.
passed
GPT-4o Sure, here's the complete implementation of the `separate_paren_groups` function:

```python
from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
""" Input to this function is a string containing multiple groups of nested parentheses. Your goal is to
separate those group into separate strings and return the list of those.
Separate groups are balanced (each open brace is properly closed) and not nested within each other
Ignore any spaces in the input string.
>>> separate_paren_groups('( ) (( )) (( )( ))')
['()', '(())', '(()())']
"""
paren_string = paren_string.replace(' ', '') # Remove all spaces from the input string
result = []
balance = 0
current_group = []

for char in paren_string:
current_group.append(char)
if char == '(':
balance += 1
elif char == ')':
balance -= 1

# When balance is zero, we have a complete group
if balance == 0 and current_group:
result.append(''.join(current_group))
current_group = []

return result

# Example usage and test
if __name__ == "__main__":
print(separate_paren_groups('( ) (( )) (( )( ))')) # Output should be ['()', '(())', '(()())']
```

This function processes the input string to remove any spaces, then iterates through each character to build groups of balanced parentheses. When a balanced group is detected (i.e., the balance counter returns to zero), it appends the group to the result list and starts a new group.
passed
llama3.1-70B-Instruct

Here is the completed Python code:

```python
from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
"""
Input to this function is a string containing multiple groups of nested parentheses.
Your goal is to separate those group into separate strings and return the list of those.
Separate groups are balanced (each open brace is properly closed) and not nested within each other
Ignore any spaces in the input string.

>>> separate_paren_groups('( ) (( )) (( )( ))')
['()', '(())', '(()())']
"""
# Remove spaces from the input string
paren_string = paren_string.replace(' ', '')

# Initialize an empty list to store the separated groups
groups = []

# Initialize an empty string to build the current group
current_group = ''

# Initialize a counter to keep track of the nesting level
nesting_level = 0

# Iterate over each character in the input string
for char in paren_string:
# If the character is an open parenthesis, increment the nesting level
if char == '(':
nesting_level += 1
# If the character is a close parenthesis, decrement the nesting level
elif char == ')':
nesting_level -= 1

# Add the character to the current group
current_group += char

# If the nesting level is 0, it means we've reached the end of a group
if nesting_level == 0:
# Add the current group to the list of groups
groups.append(current_group)
# Reset the current group
current_group = ''

# Return the list of separated groups
return groups
```

This code uses a simple state machine approach to separate the groups of parentheses. It keeps track of the nesting level of the parentheses and uses that to determine when a group is complete. The `current_group` variable is used to build the current group of parentheses, and the `groups` list is used to store the completed groups.
passed
llama3.1-405B-Instruct

from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
"""
This function separates groups of nested parentheses in a given string into separate strings.

Args:
paren_string (str): A string containing multiple groups of nested parentheses.

Returns:
List[str]: A list of strings, each representing a separate group of nested parentheses.
"""

# Remove spaces from the input string
paren_string = paren_string.replace(" ", "")

# Initialize an empty list to store the separate groups
groups = []

# Initialize an empty string to build the current group
current_group = ""

# Initialize a counter to keep track of the balance of parentheses
balance = 0

# Iterate over each character in the input string
for char in paren_string:
# If the character is an opening parenthesis, increment the balance and add it to the current group
if char ==
failed: invalid syntax (<string>, line 42)
DeepSeek-Coder-V2 Here's the completed Python code for the `separate_paren_groups` function:

```python
from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
""" Input to this function is a string containing multiple groups of nested parentheses. Your goal is to
separate those group into separate strings and return the list of those.
Separate groups are balanced (each open brace is properly closed) and not nested within each other
Ignore any spaces in the input string.
>>> separate_paren_groups('( ) (( )) (( )( ))')
['()', '(())', '(()())']
"""
result = []
stack = []
current_group = ""

for char in paren_string:
if char == ' ':
continue
if char == '(':
if stack:
current_group += char
stack.append(char)
elif char == ')':
stack.pop()
if not stack:
current_group += char
result.append(current_group)
current_group = ""
else:
current_group += char

return result

# Example usage:
print(separate_paren_groups('( ) (( )) (( )( ))'))
```

This function works as follows:
1. It initializes an empty list `result` to store the separated groups, an empty list `stack` to keep track of the open parentheses, and an empty string `current_group` to build the current group of parentheses.
2. It iterates through each character in the input string.
3. If the character is a space, it ignores it.
4. If the character is an open parenthesis `(`, it checks if the stack is not empty. If it is not, it means we are inside a group, so it adds the character to `current_group`. It then pushes the character onto the stack.
5. If the character is a close parenthesis `)`, it pops an element from the stack. If the stack becomes empty after popping, it means the current group is complete, so it adds the closing parenthesis to `current_group` and appends `current_group` to `result`. It then resets `current_group` to an empty string. If the stack is not empty, it means we are still inside a group, so it adds the closing parenthesis to `current_group`.
6. Finally, it returns the list of separated groups.
failed:
Qwen2-72B-Instruct Here is a solution using a stack data structure to track the parentheses:

```python
from typing import List


def separate_paren_groups(paren_string: str) -> List[str]:
stack = []
result = []
paren_string = paren_string.replace(' ', '') # remove spaces
for char in paren_string:
if char == '(':
stack.append(char)
elif char == ')' and stack:
group = []
while stack and stack[-1] != '(':
group = [stack.pop()] + group
stack.pop() # remove the '('
group = ''.join(group)
result.append('()' + group + '()' if group else '()')
elif not stack and char == ')':
raise ValueError('Unbalanced parentheses')
if stack:
raise ValueError('Unbalanced parentheses')
return result
```

But the above solution will generate groups like '()(()())' instead of '(()())'. So, here is a better version that does not include the outermost parentheses when recursing:

```python
from typing import List


def separate_paren_groups(paren_string: str) -> List[str]:
paren_string = paren_string.replace(' ', '')
stack = []
result = []
current_group = ''
for char in paren_string:
if char == '(':
if len(stack) == 0:
if current_group:
result.append(current_group)
current_group = ''
stack.append(char)
elif char == ')':
stack.pop()
current_group += char
if current_group:
result.append(current_group)
if stack:
raise ValueError('Unbalanced parentheses')
return result
```
This solution will return the expected result.
failed:
baichuan4 To complete the Python code for the `separate_paren_groups` function, we can use a stack-based approach to identify and extract balanced parentheses groups. Here's the completed function:

```python
from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
""" Input to this function is a string containing multiple groups of nested parentheses. Your goal is to
separate those groups into separate strings and return the list of those.
Separate groups are balanced (each open brace is properly closed) and not nested within each other.
Ignore any spaces in the input string.
>>> separate_paren_groups('( ) (( )) (( )( ))')
['()', '(())', '(()())']
"""
# Remove spaces from the input string
paren_string = paren_string.replace(" ", "")

# Initialize an empty list to store the extracted groups
groups = []
# Initialize an empty string to store the current group
current_group = ""
# Initialize a stack to keep track of opening parentheses
stack = []

# Iterate through each character in the input string
for char in paren_string:
if char == '(':
# If it's an opening parenthesis, push it onto the stack
stack.append(char)
current_group += char
elif char == ')':
# If it's a closing parenthesis, pop the last opening parenthesis from the stack
if stack:
stack.pop()
current_group += char
# If the stack is empty now, it means we have a balanced group
if not stack:
# Add the current group to the list of groups and reset the current group
groups.append(current_group)
current_group = ""
else:
# If the stack is empty and we encounter a closing parenthesis, it's unbalanced
raise ValueError("Unbalanced parentheses in input string")
else:
# Ignore non-parenthesis characters
continue

# Check if there are any unclosed opening parentheses left
if stack:
raise ValueError("Unbalanced parentheses in input string")

return groups

# Example usage:
print(separate_paren_groups('( ) (( )) (( )( ))')) # Output: ['()', '(())', '(()())']
```

This function works by iterating through each character in the input string. When it encounters an opening parenthesis, it pushes it onto a stack and starts a new group. When it encounters a closing parenthesis, it pops the last opening parenthesis from the stack and continues the current group. If the stack becomes empty, it means the current group is balanced, and the function adds it to the list of groups. If the stack is not empty at the end of the iteration, or if a closing parenthesis is encountered when the stack is empty, the function raises a `ValueError` indicating unbalanced parentheses.
passed
doubao Here's the completed Python code:

```python
from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
groups = []
stack = []
current_group = ""

for char in paren_string.replace(" ", ""):
if char == '(':
stack.append(char)
current_group += char
elif char == ')':
if stack and stack[-1] == '(':
stack.pop()
current_group += char
if not stack:
groups.append(current_group)
current_group = ""
else:
raise ValueError("Unbalanced parentheses")

if stack:
raise ValueError("Unbalanced parentheses")

return groups
```
passed
minimax To complete the function `separate_paren_groups`, we need to parse the input string and keep track of the parentheses groups. We can use a stack to help us with this task. Here's the completed function:

```python
from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
paren_string = paren_string.replace(" ", "") # Remove spaces from the input string
stack = [] # Stack to keep track of the parentheses
groups = [] # List to store the separated groups
current_group = [] # List to store the current group of parentheses

for char in paren_string:
if char == '(':
stack.append(char)
current_group.append(char)
elif char == ')':
if stack:
stack.pop()
current_group.append(char)
if not stack: # If the stack is empty, we've completed a group
groups.append(''.join(current_group))
current_group = []
else:
raise ValueError("Unbalanced parentheses in input string")

if stack:
raise ValueError("Unbalanced parentheses in input string")

return groups

# Example usage:
print(separate_paren_groups('( ) (( )) (( )( ))'))
```

This code will output:

```
['()', '(())', '(()())']
```

The function works by iterating over each character in the input string. When it encounters an opening parenthesis `'('`, it pushes it onto the stack and adds it to the current group. When it encounters a closing parenthesis `')'`, it pops from the stack (if possible) and adds it to the current group. If the stack becomes empty, it means that a group has been completed, so it adds the current group to the list of groups and resets the current group for the next one. If the stack is not empty when the function finishes iterating through the string, or if it encounters a closing parenthesis without a matching opening one, it raises a `ValueError` indicating unbalanced parentheses.
passed
kimi Here's the completed Python code for the function `separate_paren_groups`:

```python
from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
""" Input to this function is a string containing multiple groups of nested parentheses. Your goal is to
separate those group into separate strings and return the list of those.
Separate groups are balanced (each open brace is properly closed) and not nested within each other
Ignore any spaces in the input string.
>>> separate_paren_groups('( ) (( )) (( )( ))')
['()', '(())', '(()())']
"""
# Remove spaces from the input string
paren_string = paren_string.replace(" ", "")

# Initialize variables
stack = [] # Stack to keep track of parentheses
result = [] # List to store the separated groups
current_group = [] # Temporary list to store the current group

for char in paren_string:
if char == '(':
# If an open parenthesis is found, push it to the stack and start a new group
if not stack:
current_group = [char]
else:
current_group.append(char)
stack.append(char)
elif char == ')':
# If a close parenthesis is found, pop from the stack and add to the current group
stack.pop()
current_group.append(char)
# If the stack is empty, we've found a complete group
if not stack:
result.append(''.join(current_group))
current_group = []

return result

# Example usage:
print(separate_paren_groups('( ) (( )) (( )( ))'))
```

This function works by iterating over each character in the input string, ignoring spaces. It uses a stack to keep track of open parentheses and builds groups as it encounters closing parentheses. When a group is completed (i.e., the stack is empty), it is added to the result list.
passed
wenxinyiyan To solve this problem, we can use a stack to keep track of the opening parentheses and their corresponding indices in the string. Whenever we encounter a closing parenthesis, we can pop the corresponding opening parenthesis from the stack and extract the substring between them to form a separate group. Here's the completed code for the `separate_paren_groups` function:


```python
from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
result = []
stack = []
start_index = 0
paren_string = paren_string.replace(' ', '') # Ignore spaces in the input string

for i, char in enumerate(paren_string):
if char == '(':
stack.append(i)
elif char == ')':
start = stack.pop()
group = paren_string[start:i+1]
result.append(group)

return result

# Test the function
print(separate_paren_groups('( ) (( )) (( )( ))')) # Output: ['()', '(())', '(()())']
```
Note that in the code above, we first remove all spaces from the input string using the `replace` method. Then, we iterate over each character in the string. If we encounter an opening parenthesis, we push its index onto the stack. If we encounter a closing parenthesis, we pop the corresponding opening parenthesis index from the stack and extract the substring between them to form a group. Finally, we return the list of groups.
failed:
zhipu To complete the function `separate_paren_groups`, we need to iterate through the input string and keep track of the balance of parentheses. When we encounter a closing parenthesis that balances out all the opening parentheses seen so far, we know we've completed a group. We can then add that group to our result list and continue processing the rest of the string.

Here's the complete code:

```python
from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
""" Input to this function is a string containing multiple groups of nested parentheses. Your goal is to
separate those group into separate strings and return the list of those.
Separate groups are balanced (each open brace is properly closed) and not nested within each other
Ignore any spaces in the input string.
>>> separate_paren_groups('( ) (( )) (( )( ))')
['()', '(())', '(()())']
"""
result = []
current_group = []
balance = 0

for char in paren_string:
if char == ' ':
continue # Ignore spaces
if char == '(':
balance += 1
elif char == ')':
balance -= 1

current_group.append(char)

if balance == 0:
result.append(''.join(current_group))
current_group = []

return result

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

### Explanation:
1. **Initialization**:
- `result`: A list to store the separated groups of parentheses.
- `current_group`: A list to build the current group of parentheses.
- `balance`: An integer to keep track of the balance of parentheses.

2. **Iteration**:
- We iterate through each character in the input string.
- If the character is a space, we ignore it.
- If the character is an opening parenthesis `'('`, we increment the `balance`.
- If the character is a closing parenthesis `')'`, we decrement the `balance`.
- We add the character to `current_group`.

3. **Group Completion**:
- When `balance` becomes zero, it means we have a complete and balanced group of parentheses.
- We join the characters in `current_group` to form a string and add it to `result`.
- We reset `current_group` to start building the next group.

4. **Return**:
- After processing all characters, we return the `result` list containing all separated groups.

### Doctest:
- The `if __name__ == "__main__":` block is used to run the doctest module, which will verify that the function works as expected based on the provided example in the docstring.

This code should correctly separate the groups of nested parentheses in the input string and return them as a list of strings.
passed
gpto1 Certainly! Here's the complete Python function that fulfills the requirements as stated in the docstring:

```python
from typing import List


def separate_paren_groups(paren_string: str) -> List[str]:
""" Input to this function is a string containing multiple groups of nested parentheses. Your goal is to
separate those group into separate strings and return the list of those.
Separate groups are balanced (each open brace is properly closed) and not nested within each other
Ignore any spaces in the input string.
>>> separate_paren_groups('( ) (( )) (( )( ))')
['()', '(())', '(()())']
"""
# Remove spaces from the input string
paren_string = paren_string.replace(' ', '')
groups = []
idx = 0
n = len(paren_string)
while idx < n:
if paren_string[idx] == '(':
start_idx = idx
balance = 0
while idx < n:
if paren_string[idx] == '(':
balance += 1
elif paren_string[idx] == ')':
balance -= 1
idx += 1
if balance == 0:
break
group = paren_string[start_idx:idx]
groups.append(group)
else:
idx += 1 # Move to the next character if current is not '('
return groups
```

**Explanation:**

- **Remove Spaces**: We start by removing all spaces from the input string using `paren_string.replace(' ', '')` to ensure we're only dealing with parentheses.

- **Initialize Variables**: We set up an empty list `groups` to store the separated groups, and variables `idx` to traverse the string and `n` for the string length.

- **Main Loop**: We iterate through `paren_string` using `while idx < n:`. Whenever we encounter an opening parenthesis `'('`, we:

- Set `start_idx` to the current index to remember where this group starts.
- Initialize `balance = 0` to keep track of the balance between opening and closing parentheses.
- Enter a nested `while` loop to process the current group.
- Increase `balance` by 1 for every `'('` and decrease by 1 for every `')'`.
- Move `idx` forward.
- Break the loop when `balance` returns to 0, meaning we've found a complete, balanced group.
- Extract the group using slicing `paren_string[start_idx:idx]` and append it to `groups`.

- **Skip Non-parenthesis Characters**: If the current character is not `'('`, we simply increment `idx` to move to the next character.

**Example Usage:**

```python
print(separate_paren_groups('( ) (( )) (( )( ))'))
# Output: ['()', '(())', '(()())']
```

This function should work correctly for any input string that satisfies the conditions specified in the docstring.
passed
deepseekv3 To complete the `separate_paren_groups` function, we need to parse the input string and separate it into balanced groups of parentheses. Here's how we can achieve this:

1. **Remove spaces**: Since spaces are to be ignored, we first remove all spaces from the input string.
2. **Track parentheses**: We use a stack to keep track of the indices of the opening parentheses.
3. **Separate groups**: As we iterate through the string, we push the index of each opening parenthesis onto the stack. When we encounter a closing parenthesis, we pop the corresponding opening parenthesis from the stack. If the stack becomes empty after popping, we have found a complete balanced group and can add it to our result list.

Here's the completed code:

```python
from typing import List

def separate_paren_groups(paren_string: str) -> List[str]:
"""
Input to this function is a string containing multiple groups of nested parentheses.
Your goal is to separate those group into separate strings and return the list of those.
Separate groups are balanced (each open brace is properly closed) and not nested within each other.
Ignore any spaces in the input string.

>>> separate_paren_groups('( ) (( )) (( )( ))')
['()', '(())', '(()())']
"""
# Remove all spaces from the input string
paren_string = paren_string.replace(" ", "")

stack = []
result = []
start_index = 0

for i, char in enumerate(paren_string):
if char == '(':
stack.append(i)
elif char == ')':
if stack:
start_index = stack.pop()
if not stack:
# We have found a complete balanced group
result.append(paren_string[start_index:i+1])

return result

# Example usage:
print(separate_paren_groups('( ) (( )) (( )( ))')) # Output: ['()', '(())', '(()())']
```

### Explanation:
- **Step 1**: The input string `'( ) (( )) (( )( ))'` is first stripped of spaces, resulting in `'()(())()()'`.
- **Step 2**: As we iterate through the string:
- When we encounter `(`, we push its index onto the stack.
- When we encounter `)`, we pop the last index from the stack, which corresponds to the matching `(`.
- If the stack becomes empty after popping, it means we have found a complete balanced group of parentheses, which we then add to the result list.
- **Step 3**: The result list contains the separated balanced groups of parentheses.

This approach ensures that we correctly separate and return all balanced groups of parentheses in the input string.
passed