Commit a622d65

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day 25

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+23

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Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -26,4 +26,4 @@`
`26`	`26`	`\|[22](https://adventofcode.com/2020/day/22)\|Crab Combat\|[py](/day22/main.py)\|`
`27`	`27`	`\|[23](https://adventofcode.com/2020/day/23)\|Crab Cups\|[py](/day23/main.py)\|`
`28`	`28`	`\|[24](https://adventofcode.com/2020/day/24)\|Lobby Layout\|[py](/day24/main.py)\|`
`29`		`-\|[25](https://adventofcode.com/2020/day/25)\|-\|-\|`
	`29`	`+\|[25](https://adventofcode.com/2020/day/25)\|Combo Breaker\|[py](/day25/main.py)\|`

Lines changed: 22 additions & 0 deletions

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`@@ -0,0 +1,22 @@`
	`1`	`+with open("input.txt") as f:`
	`2`	`+ public_key_card, public_key_door = [int(x.strip()) for x in f]`
	`3`	`+`
	`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`
	`13`	`+`
	`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)`

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