#!/usr/bin/env python3
from pathlib import Path


def part_1(input):
    last_number = int(input[0])
    result = 0
    for line in input:
        if last_number < int(line):
            result += 1
        last_number = int(line)
    print("Part 1 result:", result)


def part_2(input):
    sums = list()
    for i in range(len(input) - 2):
        sums.append(int(input[i]))
        sums[i] += int(input[i + 1])
        sums[i] += int(input[i + 2])
    last_number = sums[0]
    result = 0
    for number in sums:
        if last_number < number:
            result += 1
        last_number = number
    print("Part 2 result:", result)


def alt_solution(input, num_summands):
    result = 0
    for i in range(len(input) - num_summands):
        if int(input[i]) < int(input[i + num_summands]):
            result += 1
    print("Alternative result:", result, ", summands =", num_summands)


input = list()
p = Path(__file__).with_name('input.txt')
with open(p) as f:
    input = f.readlines()

part_1(input)
part_2(input)
alt_solution(input, 1)
alt_solution(input, 3)