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51 lines
1.4 KiB
Python
51 lines
1.4 KiB
Python
2 years ago
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#!/usr/bin/env python3
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import re
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def main():
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board_size = 1000
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content = open('input', 'r').readlines()
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content = list(map(str.strip, content))
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board = [[0 for _ in range(board_size)] for _ in range(board_size)]
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for line in content:
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m = re.match('^(\d+),(\d+) -> (\d+),(\d+)', line)
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x1, y1, x2, y2 = tuple(map(int, m.groups(1)))
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if x1 == x2: # move in y
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if y2 < y1:
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y1, y2 = y2, y1
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assert(y1 < y2)
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print(f'marking from {x1},{y1} to {x2},{y2}')
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for y in range(y1, y2+1):
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board[y][x1] += 1
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elif y1 == y2: # move in x
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if x2 < x1:
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x1, x2 = x2, x1
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print(f'marking from {x1},{y1} to {x2},{y2}')
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assert(x1 < x2)
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for x in range(x1, x2+1):
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board[y1][x] += 1
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else: # move diagonal
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#
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offset_x = x2 - x1
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offset_y = y2 - y1
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if offset_x > 0: x_step = 1
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else: x_step = -1
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if offset_y > 0: y_step = 1
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else: y_step = -1
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for offset in range(abs(x2-x1)+1):
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board[y1+(offset*y_step)][x1+(offset*x_step)] += 1
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print(f'diagonal: going from {x1},{y1} to {x2},{y2} -> ')
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hotspots = 0
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for line in board:
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for cell in line:
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if cell > 1:
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hotspots += 1
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print(hotspots)
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if __name__ == "__main__":
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main()
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