
    Write a function that determines if a delivery route's identifier number is one less than twice its reverse value, which helps identify optimal bidirectional route pairings for fleet efficiency. For example, if route 241 is being analyzed, the function should check if 241 is one less than twice 142.
    

    
def rev(num):
    rev_num = 0
    while num > 0:
        rev_num = rev_num * 10 + num % 10
        num = num // 10
    return rev_num

def check(n):
    """
    Write a function that determines if a delivery route's identifier number is one less than twice its reverse value, which helps identify optimal bidirectional route pairings for fleet efficiency. For example, if route 241 is being analyzed, the function should check if 241 is one less than twice 142.
    

    """
def rev(num):
    rev_num = 0
    while num > 0:
        rev_num = rev_num * 10 + num % 10
        num = num // 10
    return rev_num

def check(n):
    """
    Write a function that determines if a delivery route's identifier number is one less than twice its reverse value, which helps identify optimal bidirectional route pairings for fleet efficiency. For example, if route 241 is being analyzed, the function should check if 241 is one less than twice 142.
    

    """
    return 2 * rev(n) == n + 1