day2_part1

.py

import itertools as it

def is_ascending(A):
    for i in range(len(A) - 1):
        if A[i] - A[i + 1] > 0:
            return False
    return True

def is_descending(A):
    for i in range(len(A) - 1):
        if A[i] - A[i+1] < 0:
            return False
    return True

def pairwise(seq):
    """s -> (s0,s1), (s1,s2), (s2,s3), ..."""
    a, b = it.tee(seq)
    next(b, None)
    return zip(a, b)


def substract(left_op, right_op):
    return left_op - right_op

def plus(left_op, right_op):
    return left_op + right_op


def check_unsafe_order(lst):
    # 0 - UNSAFE
    # 1 - SAFE

    p = list(pairwise(lst))
    for x in p:
        if x[0] - x[1] == 0:
            
            return 0

    if is_ascending(lst):
        return 1
    if is_descending(lst):
        return 1
    else:
        # print(lst)
        return 0


def is_safe(lst):
    # true or false
    if check_unsafe_order(lst) == 0:
        return False

    pairs = pairwise(lst)
    for p in pairs:
        if abs(substract(p[0], p[1])) <= 3 and abs(substract(p[0], p[1])) >= 1:
            continue
        else:
            return False
    return True

def safe_report_count():
    safest_result = []
    f = open('examplereport.txt', 'r')
    for l in f.readlines():
        level_line = [int(x) for x in l.split()]
        if is_safe(level_line):
            safest_result.append(True)
    return len(safest_result))



print(safe_report_count())