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tfaughnantfaughnan
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day17: add solutions
1 parent e443220 commit ddf558f

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lines changed

4 files changed

+196
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‎day17/1.py

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#!/usr/bin/env pypy3
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import itertools
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import sys
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from collections import defaultdict
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WIDTH = 7
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ITERATIONS = 2022
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ROCKS = itertools.cycle((
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((1, 1, 1, 1),
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(0, 0, 0, 0),
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(0, 0, 0, 0),
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(0, 0, 0, 0)),
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((0, 1, 0, 0),
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(1, 1, 1, 0),
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(0, 1, 0, 0),
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(0, 0, 0, 0)),
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((0, 0, 1, 0),
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(0, 0, 1, 0),
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(1, 1, 1, 0),
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(0, 0, 0, 0)),
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((1, 0, 0, 0),
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(1, 0, 0, 0),
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(1, 0, 0, 0),
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(1, 0, 0, 0)),
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((1, 1, 0, 0),
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(1, 1, 0, 0),
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(0, 0, 0, 0),
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(0, 0, 0, 0)),
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))
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ROCK_HEIGHTS = itertools.cycle((1, 3, 3, 4, 2))
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ROCK_WIDTHS = itertools.cycle((4, 3, 3, 1, 2))
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DIRECTIONS = {
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'<': -1,
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'>': 1,
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}
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PUSHES = itertools.cycle(sys.stdin.read().strip())
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def can_push(chamber, rock, rockw, rockh, x, y, dx, dy):
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nx = x + dx
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ny = y + dy
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for r in range(rockh):
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for c in range(rockw):
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if not rock[r][c]:
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continue
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if nx + c not in range(WIDTH):
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return False
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if ny - r < 0:
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return False
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if chamber[nx + c, ny - r]:
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return False
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return True
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def main():
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chamber = defaultdict(int)
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tower_height = -1
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for _ in range(ITERATIONS):
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rock = next(ROCKS)
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rockh = next(ROCK_HEIGHTS)
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rockw = next(ROCK_WIDTHS)
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x = 2
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y = tower_height + 3 + rockh
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atrest = False
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while not atrest:
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dx = DIRECTIONS[next(PUSHES)]
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if can_push(chamber, rock, rockw, rockh, x, y, dx, 0):
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x += dx
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if can_push(chamber, rock, rockw, rockh, x, y, 0, -1):
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y -= 1
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else:
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atrest = True
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for r in range(rockh):
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for c in range(rockw):
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if rock[r][c]:
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chamber[x + c, y - r] = 1
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tower_height = max(tower_height, y)
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print(tower_height + 1)
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if __name__ == '__main__':
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main()

‎day17/2.py

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#!/usr/bin/env pypy3
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import itertools
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import sys
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from collections import defaultdict
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WIDTH = 7
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ITERATIONS = 1000000000000
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NUMROCKS = 5
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ROCKS = enumerate(itertools.cycle((
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((1, 1, 1, 1),
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(0, 0, 0, 0),
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(0, 0, 0, 0),
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(0, 0, 0, 0)),
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((0, 1, 0, 0),
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(1, 1, 1, 0),
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(0, 1, 0, 0),
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(0, 0, 0, 0)),
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((0, 0, 1, 0),
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(0, 0, 1, 0),
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(1, 1, 1, 0),
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(0, 0, 0, 0)),
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((1, 0, 0, 0),
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(1, 0, 0, 0),
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(1, 0, 0, 0),
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(1, 0, 0, 0)),
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((1, 1, 0, 0),
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(1, 1, 0, 0),
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(0, 0, 0, 0),
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(0, 0, 0, 0)),
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)))
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ROCK_HEIGHTS = itertools.cycle((1, 3, 3, 4, 2))
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ROCK_WIDTHS = itertools.cycle((4, 3, 3, 1, 2))
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DIRECTIONS = {
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'<': -1,
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'>': 1,
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}
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PUSH_LIST = sys.stdin.read().strip()
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NUMPUSHES = len(PUSH_LIST)
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PUSHES = enumerate(itertools.cycle(PUSH_LIST))
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def can_push(chamber, rock, rockw, rockh, x, y, dx, dy):
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nx = x + dx
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ny = y + dy
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for r in range(rockh):
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for c in range(rockw):
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if not rock[r][c]:
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continue
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if nx + c not in range(WIDTH):
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return False
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if ny - r < 0:
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return False
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if chamber[nx + c, ny - r]:
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return False
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return True
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def main():
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chamber = defaultdict(int)
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tower_height = -1
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history = {}
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period = None
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for numdropped in range(ITERATIONS):
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rock_index, rock = next(ROCKS)
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rockh = next(ROCK_HEIGHTS)
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rockw = next(ROCK_WIDTHS)
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x = 2
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y = tower_height + 3 + rockh
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atrest = False
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while not atrest:
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push_index, push = next(PUSHES)
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dx = DIRECTIONS[push]
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if can_push(chamber, rock, rockw, rockh, x, y, dx, 0):
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x += dx
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if can_push(chamber, rock, rockw, rockh, x, y, 0, -1):
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y -= 1
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else:
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atrest = True
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for r in range(rockh):
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for c in range(rockw):
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if rock[r][c]:
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chamber[x + c, y - r] = 1
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tower_height = max(tower_height, y)
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if period:
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ran_height = next(v for _, v in history.items()
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if v[0] == sim_start + (ITERATIONS - sim_end - 1))[1]
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sim_height = dheight * numsims
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tower_height = ran_height + sim_height
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break
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else:
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skyline = tuple(tower_height - max((y for x, y in chamber
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if chamber[x, y] and x == xx),
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default=0)
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for xx in range(WIDTH))
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key = (rock_index % NUMROCKS, push_index % NUMPUSHES, skyline)
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if key in history:
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sim_start = history[key][0]
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period = numdropped - sim_start
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dheight = tower_height - history[key][1]
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numsims = (ITERATIONS - sim_start) // period
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sim_end = numsims * period + sim_start
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else:
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value = (numdropped, tower_height)
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history[key] = value
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print(tower_height + 1)
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if __name__ == '__main__':
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main()

‎day17/input.txt

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><<<>>><<<><<<>>><<>>>><<<>>>><>>>><<<>>><<<<>>><<>>>><<<>>><<<<>>><<<<>>><<<<>>>><<<<>>>><<<<>><<<<><<<<><<<>>>><<<>><<>>><<<>><<>>><<>>><>><<<>><<<<>>><<>><>>><<<<>>><>><>>><<<<>>>><<<>>><<<><<<<>>><><>>>><<<><<<<>><<<>><<<>>>><><<<><<>>>><<>>>><<<><<>>>><<>><<><<<>><>>>><<<>>>><<<>><>><<<>>>><<<<><<><<<>><<>>>><<<<>><<<<><<<<><<<<><>><<><<>>><>><<<<>>><>>><>>>><<<<>>><><<>><<<<><<<>>><>>><<<><<<<><<<<><<<<>><>>><><><<<<>><>>>><<<<><>><<<<>>><<<>>><<>>>><<<<><>>>><<>><<<<>>>><<>>><<<>>><><<>>>><<<<>><<>>><<<>><><<<<>>>><<<<>>><>>>><<>>>><<<>>><>>>><<<>>>><<><<>>><>>><<<>>><<<>><>>><<<<>><<<><<>>><>>>><<<<>>><<<>>><<<<>>><<<<>><<>><><<<<>><<<>>><<<<><<<<>>>><<<>><<<><>>><<>>>><<<>>>><<>>><<<<>>><<<>>>><<<>><<<<>>><<<<>>><<>>>><<<>>>><>>><<<>>>><<>><>>>><<>>>><<<>>>><<<<><<<><<>><<<>><<<>>>><<>>>><<<<>><>>>><<<<><<<<>><<>><<>><<<<>>><<>><<><>>>><<<>><>><<>><<>><>><<<>><<<<><<<>>>><<<>>>><<<<>><>><<<<><<<>><<<<>>><>>><<<<><<<>><<<<>><<>>>><<<>>>><<<<>><<<>><><<<<>>><>><<><<<<>><<<><<<><<<<>>>><<<<>>>><><>><<<>>>><<<<>><>>><<<<><<>>><<<>>>><<>><<<>>><>>><<><<<>>><<<><<<>>><<<<><<<<>><<><<>><><<<<>><<<<>>>><><<<>>>><<<>><>>>><<>>>><<<<>>>><<<>>><<<<><<>>>><<<><<<>>>><<><<<>>>><><<<><>>>><>>>><<<>>><>><>>>><>><<>>><>>>><<<>>><<>>>><<>>>><<><<<<>>>><<>>><>><<<<>>><<<>>>><<<>>>><<>>><>><>><<<<>>>><<><<><>>>><<>>>><>>><<<<>>>><<<<>>><<><<<><<>>>><<>>><>>><>>><<<><<<>>>><<<>><<>>><><<<<>>><<<<>><<<>>>><<>><<<<><<<><<<<>><<<<>>>><<><<<><<<<>>>><<<<><<<<>>><<<>>>><<<>>><><<<<>>>><<<>><<<<><>><<<><<>>><>>>><<<><<<<>><<<<><<<<>><<>>>><>><<<>>>><<<<><<<>><<<>>>><><<<>><<<><<<<>>>><><<>><<>>><<<<><<<<><<<<><<>>>><<>>>><<><<<<>><<<<>><<<><>><<<<><<<>>>><<<>><>>>><<<<><<<<><<>><<>><<<<>><<<<>><><><<>><<<<>>>><<<>>>><>>><<<>>>><<>>><><><<><>>><<<<>>>><<>>><<<>>>><<<>>>><>><<<<>>>><<<<>>><<>>>><>>><<<<>>>><<<>>>><<<<>><><>><<<>>>><<>><<<>>><>>>><<<>>>><>><<<>>><<<<>><<<>><<<<>>>><>>>><><><<>><<<<>><<<>><<><<<<>><<>>><>><<><<>><<<<>>><>>>><<<>>>><<>>><>>>><<<><<<<>>>><<<><<<><<<>><<>>>><<<><<<<><<<<>>>><<<<>>>><<<><<<<>>><<>>>><<<>><<<>><<>>>><<>><<<>>>><><<<<>><><<<<>><<<>>><<<>>>><<<>>>><<>>><<<>><<<><>><><<<><>>>><<><<<<>>>><>>><<>>><>>>><<<<>>>><<>><<<<>><<<>><><<<<>><<>>>><<>>>><<<>><<<<>>><<><<<<>>><<>>>><<>><<<<>><<><<<><>><>>><>><<<>>><<<<>>><<>>>><<<><<<<><<<<>><<<<>>>><<<<>>><<>><<<><>>>><<<><<>>>><<<>><>>>><<<<>><<<<>><<>>>><<><<<><>>><<<>>><<>>><<>><<<<>>>><<<<>><<<<>><<<>>>><<<<>>><<>>><<<<><<<>>><<<><<>><<<<>><>>><<><<>>><<<<>>>><<<>>><<<>><<<<>>>><<>><<<<>><><<>>>><>><<<>><<<>><<<<>><>><>><<<>>>><<>><<><<>>><<>>>><<<<>>><<>>>><><<<>>><<>><<<<><<<<>><<>>>><<<<>>>><>>><>>><<<>><><<<>>><<<<>>><>>>><<<>><<<<><<<>>><<<<>>>><<<>>>><<<<>>><<<>><<<<>>><<<>>>><<<<>>>><>>><<<<><><<><<><<>>>><>>>><<<>>><<><><><<<<><<<<>>><<<>>>><<<<>>>><>>><<>>><<>><<<>>>><<><<>><<>>><<<><<<><<<>>>><>><>>><>>>><<<<>>><>><<<><>>>><<<>>>><<<><<<<>>><<<<><<>>><>>>><><<><<<<>>><>>><>><<>>><<<>>>><<<>>>><<<<><<<>>><<<<><<<>>>><<<>>>><>>><<>>>><<>>><<<<><>>><<<><<>><>>><>><<>><<>><<<>>>><<<<>><<<>>><<<<>>>><<>><>>><>>><<<>><<<><<>><>><><<<>>>><<<><<>><<<>>><<<<>><<<>>>><<<<>><>>>><>><<<><>>>><<<<><<<><>>>><<<>>>><><>>><><>>><<<>>>><<>>><<>><<>><>><>>>><<<>>>><><>>><<<<>>><<<>><<><>><<<<>>><<>>>><<<>>><<<>>><<<><<<>><<<<>>><><>>>><<>><<<>>><<<<>><<<>><><<<>>><<<><>>>><><<>><<<><<<>>><<<>>><<>>>><<<>>><<<<>>>><<>>>><<>>><<<<>><>>>><<>>>><><<>><><<<<>><<>>><<>>><<<><<>>><<<>><<<>>>><<>>><>>>><<<><<<><<>>>><><<<<>>><<>>><<<<>>>><<<>>><<<<>>>><<<<>><<>><<>>><<<>>><<<><<<<>>>><<>><<<><<<<>><<<<>>>><<><<<<><>><><<<>><<><<<>>>><<><<<><>>>><<<>>>><<<<><<>>><<<>>><<>>><<><<<<><>>><<>><<<<><<<>><<><><<<><<<><><>>><<><>>>><<><<<><<<<>>>><><<>>>><<><<><<<>>><<<<>><<<><<<>>><<<>>>><<<<>>><<>>>><<<><<<<>><<<<><<<>>>><<<>>>><<<>>>><<<>><<>>>><>><<<><<>>><<<<>>>><><<<<>>><<>><<>><<<<>><<<<><<<<>><<<<>><<<<>>><<>>>><<<<>>>><<<<>>><<<><><<<<>>><<<>>><<>><<><<<>>>><<>><<<><>><<<<>>><<<<><<<<><<><>><<>>><<<><<><<<<>>><<<>>><<<<>><<<<>>>><>>>><><<>><<>><>><<<><<>>>><<<>><<<><<>><<><<<<>>><<>>><<<<>>>><>><<>>>><<<>>><>><<<<>>><<<<>>>><<<>>><<>>><<<<><<<><>>><>><<<>>>><><<<>><<><>><<<><<<>><<>>>><<>>>><<<>><<<>>>><>>><><>>><<<>>>><<<>>><<<><<<<>><<<<><><<<><<><<<<>><><<<<>>><<<>><<<<>>>><<<>>>><<<>>><<<>>><<>>>><<>>>><<<>>>><<<>>><<<>><>>><>>><<<>>>><<>>>><<><>>>><<<><<<>>>><<><<<>><<>><<<<><<<<>>>><<<<><>>><<<<>>>><<<>>>><><<><<<>>>><<<><<>><<>>>><>>><>>>><<>>><<>><<>>><>>><<<>>>><<<>>><<<<>>><<<>>>><<<<>><><<>>>><<<<><>>><<><<<>>>><>>>><<>>>><<<><<><<<<>>>><>>><<<>>>><<<>><><<>>><<<><<>><><<<>>><<<<><<><<<>>><<>>><>>>><>>><<>>><>><><<<<>>>><<<<>>>><><<<<><<<<><<<<>>>><<<<>>><<<<><<<>><<>>>><<><<<>>><<><<<>><>>><<<<>>><<><<>>><<<><<><<<>><<<<><<>>><><<>><><><<<><<>>><<>>>><<<<>>><<<>><<<<><<>>>><>>>><<<<><<<<>>>><<>>><<<<>>><<>>><<<>>><>>><<<>>>><<<>><<><<<<><>>>><<>><<>>>><<<>>><<<>>><>>><<<<>><<<<>><<><<<<>>><<>>>><>>>><>>><<<<>>>><><<<>>>><<<<>>>><<<>>>><<<>>>><<<<><<<>>>><<<>>><<<<>>>><<<><>>><><>>>><<<<>><<>>><<<><<<<><<>><<<<>><><<><<<>>><<<<>><<<>>>><<<>>>><<>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‎day17/sample.txt

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>>><<><>><<<>><>>><<<>>><<<><<<>><>><<>>

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