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Original file line number Diff line number Diff line change 2626| [ 22] ( https://adventofcode.com/2020/day/22 ) | Crab Combat| [ py] ( /day22/main.py ) |
2727| [ 23] ( https://adventofcode.com/2020/day/23 ) | Crab Cups| [ py] ( /day23/main.py ) |
2828| [ 24] ( https://adventofcode.com/2020/day/24 ) | Lobby Layout| [ py] ( /day24/main.py ) |
29- | [ 25] ( https://adventofcode.com/2020/day/25 ) | Combo Breaker| [ py] ( /day25/main.py ) , [ alt ] ( /day25/alt.py ) |
29+ | [ 25] ( https://adventofcode.com/2020/day/25 ) | Combo Breaker| [ py] ( /day25/main.py ) |
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Original file line number Diff line number Diff line change 11with open ("input.txt" ) as f :
2- public_key_card , public_key_door = [int (x . strip () ) for x in f ]
2+ pub1 , pub2 = [int (x ) for x in f ]
33
4- def calc_loop_size (public_key ):
5- subject_number = 7
6- n = 1
7- i = 0
8- while True :
9- n = (n * subject_number ) % 20201227
10- if n == public_key :
11- return i + 1
12- i += 1
4+ n = 1
5+ loop_size = 0
6+ while n != pub2 :
7+ n = (n * 7 ) % 20201227
8+ loop_size += 1
139
14- def calc_encryption_key (subject_number , loop_size ):
15- n = 1
16- for i in range (loop_size ):
17- n = (n * subject_number ) % 20201227
18- return n
19-
20- loop_size = calc_loop_size (public_key_card )
21- enc_key = calc_encryption_key (public_key_door , loop_size )
22- print (enc_key )
10+ print (pow (pub1 , loop_size , 20201227 ))
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