47 lines
975 B
Python
Executable File
47 lines
975 B
Python
Executable File
#!/bin/python
|
|
|
|
import time
|
|
|
|
# Source node: [Destination nodes]
|
|
edges = {}
|
|
|
|
# Returns amount of paths
|
|
def find_all_paths(start, target):
|
|
#print(f"Checking from {start} to {target}")
|
|
if start == target:
|
|
return 1
|
|
|
|
total = 0
|
|
for node in edges[start]:
|
|
if node > target:
|
|
continue
|
|
|
|
total += find_all_paths(node, target)
|
|
|
|
return total
|
|
|
|
with open("input", 'r') as input:
|
|
adapters = [int(i.strip()) for i in input]
|
|
|
|
adapters.sort()
|
|
adapters.insert(0, 0)
|
|
adapters.append(adapters[-1]+3)
|
|
i = 0
|
|
while i < len(adapters)-1:
|
|
source = adapters[i]
|
|
edges[source] = []
|
|
j = i+1
|
|
while j < len(adapters)-1 and adapters[j]-source <= 3:
|
|
edges[source].append(adapters[j])
|
|
j += 1
|
|
i += 1
|
|
|
|
|
|
print(edges)
|
|
|
|
start_time = time.time()
|
|
|
|
print(find_all_paths(adapters[0], adapters[-1]))
|
|
|
|
print(f"Calculation time: {time.time() - start_time}")
|