82 lines
2.2 KiB
Python
82 lines
2.2 KiB
Python
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from queue import PriorityQueue
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VERBOSE = True
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def verbose(s = "", *args, **kwargs):
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if VERBOSE:
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print(s, *args, **kwargs)
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def get_input(sample = False, part = 1):
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with open(f'sample_p{part}' if sample else 'input', 'r') as f:
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return [[int(c) for c in line.strip()] for line in f.readlines()]
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def in_bounds(coords, grid):
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x, y = coords
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w, h = len(grid[0]), len(grid)
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return x >= 0 and x < w and y >= 0 and y < h
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def result(inp, part = 1):
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if part == 2:
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new_inp = []
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for y in range(5):
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for row in inp:
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new_row = []
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for x in range(5):
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for c in row:
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tba = c + x + y
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if tba > 9:
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tba -= 9
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new_row.append(tba)
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new_inp.append(new_row[:])
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inp = new_inp[:]
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res = 0;
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start = (0, 0)
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end = (len(inp[0]) - 1, len(inp) - 1)
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dists = [[2**30 for _ in range(len(inp[0]))] for _ in range(len(inp))]
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prevs = [[(-1, -1) for _ in range(len(inp[0]))] for _ in range(len(inp))]
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q = PriorityQueue()
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q.put((0, start))
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cur = start
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while cur != end:
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dist, cur = q.get()
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x, y = cur
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verbose(f"looking at {cur = } ({end = })")
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for d in [(x-1, y), (x, y-1), (x+1, y), (x, y+1)]:
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if in_bounds(d, inp):
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x_, y_ = d
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new_dist = dist + inp[y_][x_]
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if dists[y_][x_] > new_dist:
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verbose(f"\tlooking at {d = }")
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prevs[y_][x_] = cur
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dists[y_][x_] = new_dist
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q.put((new_dist, d))
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path = set()
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cur = end
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verbose(f"Creating path from {end = }")
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while cur != (0, 0):
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verbose(f"\tlooking at {cur = }")
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path.add(cur)
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cur = prevs[cur[1]][cur[0]]
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path.add(cur)
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for y, row in enumerate(inp):
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for x, c in enumerate(row):
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verbose((BOLD + str(c) + END) if (x, y) in path else c, end='')
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verbose()
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res = dists[end[0]][end[1]]
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return res
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BOLD = '\033[95m'
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END = '\033[0m'
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if __name__ == "__main__":
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VERBOSE = False
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print(result(get_input(), part = 2))
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