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#!/usr/bin/env python3
import aoc20
import functools
import sys
def pt1(_in):
jolts = [int(n.strip()) for n in _in]
jolts.append(max(jolts)+3)
jolts = sorted(jolts)
jolt = 0
diffs = [0, 0, 0]
for j in jolts:
diffs[j-jolt-1] += 1
jolt = j
return diffs[0] * diffs[2]
def pt2(_in):
jolts = [int(n.strip()) for n in _in]
jolts.append(max(jolts)+3)
jolts = sorted(jolts)
jolts.insert(0, 0)
jolt = 0
reach = {}
for i in range(len(jolts)):
reachable = []
j = i+1
while j < len(jolts) and jolts[j] - jolts[i] <= 3:
reachable.append(jolts[j])
j += 1
reach[jolts[i]] = tuple(reachable)
@functools.cache
def ways(start, dest):
if start == dest:
return 1
return sum(ways(child, dest) for child in reach[start])
return ways(jolts[0], jolts[-1])
if __name__ == "__main__":
input = aoc20.read_input(sys.argv[1:], 10)
print(pt1(input))
print(pt2(input))
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