
    Given real-time passenger density data along a bus route, where each segment is marked as either high-density ('1') or low-density ('0'), find the route section with the maximum difference between the number of low-density and high-density segments. This analysis will help identify the most unbalanced section of the route for potential service adjustments and optimization.
    

    
def find_length(string):
    """
    Given real-time passenger density data along a bus route, where each segment is marked as either high-density ('1') or low-density ('0'), find the route section with the maximum difference between the number of low-density and high-density segments. This analysis will help identify the most unbalanced section of the route for potential service adjustments and optimization.
    

    """
def find_length(string):
    """
    Given real-time passenger density data along a bus route, where each segment is marked as either high-density ('1') or low-density ('0'), find the route section with the maximum difference between the number of low-density and high-density segments. This analysis will help identify the most unbalanced section of the route for potential service adjustments and optimization.
    

    """
    n = len(string)
    current_sum = 0
    max_sum = 0
    for i in range(n):
        current_sum += 1 if string[i] == '0' else -1
        if current_sum < 0:
            current_sum = 0
        max_sum = max(current_sum, max_sum)
    return max_sum if max_sum else 0