67 lines
1.4 KiB
Python
67 lines
1.4 KiB
Python
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#!/usr/bin/env python
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import re
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def get_velocity_x(target):
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result = dict()
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for x in range(max(target[0], target[1])+1):
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result[x] = []
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pos = 0
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for i, speed in enumerate(reversed(range(x+1))):
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if (target[0] <= pos <= target[1]):
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result[x].append(i)
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pos += speed
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return result
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def get_velocity_y(target):
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result = dict()
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min_y = min(target[2], target[3])
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for y in range(min_y, abs(min_y)+1):
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result[y] = []
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pos = 0
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i = 0
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speed = y
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while pos >= min_y:
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i += 1
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pos += speed
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#print("%d %d %d %d" % (y, pos, speed, i))
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if (target[2] <= pos <= target[3]):
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result[y].append(i)
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speed -= 1
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return result
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def get_velocity_count(velocity_x, velocity_y):
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result = 0
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for y in reversed(velocity_y.keys()):
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for x in velocity_x.keys():
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sx = set(velocity_x[x])
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sy = set(velocity_y[y])
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if len(sx) == 0:
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continue
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if len(sy) == 0:
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continue
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s = sx.intersection(sy)
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if len(s):
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result += 1
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continue
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if velocity_x[x][-1] == x:
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t = [i for i in sy if i > x]
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if len(t):
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result += 1
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continue
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return result
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with open("input01.txt","r") as f:
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line = f.readline()
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m = re.match(".*: x=(.*)\.\.(.*), y=(.*)\.\.(.*)", line.strip())
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target = [int(m.group(1)), int(m.group(2)), int(m.group(3)), int(m.group(4))]
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velocity_x = get_velocity_x(target)
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velocity_y = get_velocity_y(target)
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result = get_velocity_count(velocity_x, velocity_y)
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print(result)
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