Advent of Code 2020: Python Solution Day 9
Viper
Posted on December 9, 2020
This challenge is the easiest one I encountered on this season. And I was able to find a working algorithm. Still I am not even on top 7k. I started with copying test example and pasting on day9_test.txt and my input on day9.txt both are at same directory as my notebook is.
Lets share your solution too.
Challenge 1
with open("day9.txt", "r") as fp:
lines = [int(line.rstrip()) for line in fp.readlines()]
# lines
def challenge1(codes, premable):
previous_stack = []
i = 0
start = 0
end = start+premable
curr_index = premable
while curr_index < len(codes)-1:
stack = codes[start:end]
if curr_index > len(stack)-1:
start+=1
end+=1
valid = False
for i in stack[:-1]:
for j in stack[1:]:
#print(codes[curr_index], i, j)
if i+j == codes[curr_index]:
valid = True
break
else:
valid == False
if valid:
break
if valid == False:
return codes[curr_index]
curr_index+=1
# print(stack)
# break
challenge1(lines, 25)
Challenge 2
Used NumPy for taking sum faster.
import numpy as np
def challenge2(codes, invalid_num):
contigous_list = []
for i in range(0, len(codes)-1):
for j in range(1, len(codes)-1):
stack = np.array(codes[i:j])
if np.sum(stack) == invalid_num:
print(stack, stack.min()+stack.max())
# print(stack)
challenge2(lines, challenge1(lines, 25))
I write blogs about Computer Vision projects on my GitHub page q-viper.github.io and if you got some time please share yours too.
💖 💪 🙅 🚩
Viper
Posted on December 9, 2020
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