Python: Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones of same length

Last update on April 16 2025 13:04:28 (UTC/GMT +8 hours)

Consecutive Zero-One Checker

Write a Python program to check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones of same length in a given string. Return True/False.

Sample Solution-1:

Python Code:

# Define a function 'test' that checks if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in a string 'str1'.
def test(str1):
    # Use a 'while' loop to repeatedly find and replace '01' with an empty string in 'str1'.
    while '01' in str1:
        str1 = str1.replace('01', '')
    
    # Check if the length of the modified 'str1' is equal to 0 and return the result.
    return len(str1) == 0

# Define the input string 'str1'.
str1 = "01010101"

# Print the original sequence.
print("Original sequence:", str1)

# Print the result of the 'test' function for 'str1'.
print("Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:")
print(test(str1))

# Repeat the same process for other test cases.
str1 = "00"
print("\nOriginal sequence:", str1)
print("Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:")
print(test(str1))
str1 = "000111000111"
print("\nOriginal sequence:", str1)
print("Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:")
print(test(str1))
str1 = "00011100011"
print("\nOriginal sequence:", str1)
print("Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:")
print(test(str1))

Sample Output:

Original sequence: 01010101
Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:
True

Original sequence: 00
Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:
False

Original sequence: 000111000111
Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:
True

Original sequence: 00011100011
Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:
False

Flowchart:

Sample Solution-2:

Python Code:

# Define a function 'test' that checks if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in a string 'str1'.
def test(str1):
    # Initialize an empty list 'temp' to store '0's.
    temp = []
    
    # Iterate through each character 'x' in the input string 'str1'.
    for x in str1:
        # If 'x' is '0', append '0' to the 'temp' list.
        if x == '0':
            temp.append('0')
        else:
            # If 'x' is not '0', remove the last element from 'temp'.
            temp.pop()
    
    # Check if 'temp' is empty (all '0's were matched by '1's) and return the result.
    return not temp

# Define the input string 'str1'.
str1 = "01010101"

# Print the original sequence.
print("Original sequence:", str1)

# Print the result of the 'test' function for 'str1'.
print("Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:")
print(test(str1))

# Repeat the same process for other test cases.
str1 = "00"
print("\nOriginal sequence:", str1)
print("Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:")
print(test(str1))
str1 = "000111000111"
print("\nOriginal sequence:", str1)
print("Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:")
print(test(str1))
str1 = "00011100011"
print("\nOriginal sequence:", str1)
print("Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:")
print(test(str1))

Sample Output:

Original sequence: 01010101
Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:
True

Original sequence: 00
Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:
False

Original sequence: 000111000111
Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:
True

Original sequence: 00011100011
Check if every consecutive sequence of zeroes is followed by a consecutive sequence of ones in the said string:
False

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python function to count the number of alternating zero-one sequences in a binary string.
Write a Python program to determine if a binary string has equal numbers of zeroes and ones.
Write a Python function to check if a binary string has at most one consecutive sequence of zeroes.
Write a Python program to find the longest consecutive sequence of zeroes in a binary string.

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