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packet_scanners_part_two.py
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packet_scanners_part_two.py
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"""
--- Part Two ---
Now, you need to pass through the firewall without being caught - easier said
than done.
You can't control the speed of the packet, but you can delay it any number of
picoseconds. For each picosecond you delay the packet before beginning your
trip, all security scanners move one step. You're not in the firewall during
this time; you don't enter layer 0 until you stop delaying the packet.
In the example above, if you delay 10 picoseconds (picoseconds 0 - 9), you won't
get caught:
State after delaying:
0 1 2 3 4 5 6
[ ] [S] ... ... [ ] ... [ ]
[ ] [ ] [ ] [ ]
[S] [S] [S]
[ ] [ ]
Picosecond 10:
0 1 2 3 4 5 6
( ) [S] ... ... [ ] ... [ ]
[ ] [ ] [ ] [ ]
[S] [S] [S]
[ ] [ ]
0 1 2 3 4 5 6
( ) [ ] ... ... [ ] ... [ ]
[S] [S] [S] [S]
[ ] [ ] [ ]
[ ] [ ]
Picosecond 11:
0 1 2 3 4 5 6
[ ] ( ) ... ... [ ] ... [ ]
[S] [S] [S] [S]
[ ] [ ] [ ]
[ ] [ ]
0 1 2 3 4 5 6
[S] (S) ... ... [S] ... [S]
[ ] [ ] [ ] [ ]
[ ] [ ] [ ]
[ ] [ ]
Picosecond 12:
0 1 2 3 4 5 6
[S] [S] (.) ... [S] ... [S]
[ ] [ ] [ ] [ ]
[ ] [ ] [ ]
[ ] [ ]
0 1 2 3 4 5 6
[ ] [ ] (.) ... [ ] ... [ ]
[S] [S] [S] [S]
[ ] [ ] [ ]
[ ] [ ]
Picosecond 13:
0 1 2 3 4 5 6
[ ] [ ] ... (.) [ ] ... [ ]
[S] [S] [S] [S]
[ ] [ ] [ ]
[ ] [ ]
0 1 2 3 4 5 6
[ ] [S] ... (.) [ ] ... [ ]
[ ] [ ] [ ] [ ]
[S] [S] [S]
[ ] [ ]
Picosecond 14:
0 1 2 3 4 5 6
[ ] [S] ... ... ( ) ... [ ]
[ ] [ ] [ ] [ ]
[S] [S] [S]
[ ] [ ]
0 1 2 3 4 5 6
[ ] [ ] ... ... ( ) ... [ ]
[S] [S] [ ] [ ]
[ ] [ ] [ ]
[S] [S]
Picosecond 15:
0 1 2 3 4 5 6
[ ] [ ] ... ... [ ] (.) [ ]
[S] [S] [ ] [ ]
[ ] [ ] [ ]
[S] [S]
0 1 2 3 4 5 6
[S] [S] ... ... [ ] (.) [ ]
[ ] [ ] [ ] [ ]
[ ] [S] [S]
[ ] [ ]
Picosecond 16:
0 1 2 3 4 5 6
[S] [S] ... ... [ ] ... ( )
[ ] [ ] [ ] [ ]
[ ] [S] [S]
[ ] [ ]
0 1 2 3 4 5 6
[ ] [ ] ... ... [ ] ... ( )
[S] [S] [S] [S]
[ ] [ ] [ ]
[ ] [ ]
Because all smaller delays would get you caught, the fewest number of
picoseconds you would need to delay to get through safely is 10.
What is the fewest number of picoseconds that you need to delay the packet to
pass through the firewall without being caught?
"""
from copy import deepcopy
from utils.scanners import load_scanners, move_scanners
def main():
start_layers = load_scanners()
delay = 0
while True:
delay += 1
caught = False
start_layers = move_scanners(start_layers)
layers = deepcopy(start_layers)
for k in range(0, len(layers)):
if layers[k]['s'] == 0:
caught = True
break
layers = move_scanners(layers)
if not caught:
print(delay)
break
if __name__ == '__main__':
main()