86 lines
1.9 KiB
Python
86 lines
1.9 KiB
Python
import shared
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from scanf import scanf
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from dataclasses import dataclass
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@dataclass
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class Probe:
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x: int
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y: int
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x_vel: int
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y_vel: int
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@dataclass
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class Box:
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x1: int
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x2: int
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y1: int
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y2: int
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@property
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def max_x(self):
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return max(self.x1, self.x2)
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@property
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def min_y(self):
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return min(self.y1, self.y2)
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class TrickShot:
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def __init__(self, target, x_vel, y_vel):
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self.target = target
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self.probe = Probe(0, 0, x_vel, y_vel)
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self.y_max = -9999
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def step(self):
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self.probe.x += self.probe.x_vel
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self.probe.y += self.probe.y_vel
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if self.probe.y > self.y_max:
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self.y_max = self.probe.y
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self.probe.x_vel += towards_zero(self.probe.x_vel)
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self.probe.y_vel -= 1
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def check_in_target(self):
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return (
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self.target.x1 <= self.probe.x <= self.target.x2
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and self.target.y1 <= self.probe.y <= self.target.y2
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)
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def check_out_of_bounds(self):
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return self.probe.y < self.target.min_y or self.probe.x > self.target.max_x
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def towards_zero(value):
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if value > 0:
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return -1
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elif value == 0:
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return 0
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else:
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return 1
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def main():
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with open(shared.get_fname(17), "r") as f:
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target = Box(*scanf("target area: x=%d..%d, y=%d..%d", f.read()))
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hits = []
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for x in range(target.max_x + 1):
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for y in range(target.min_y, -target.min_y):
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t = TrickShot(target, x, y)
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while True:
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t.step()
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if t.check_in_target():
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hits.append((x, y, t.y_max))
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break
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elif t.check_out_of_bounds():
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break
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hits = sorted(hits, key=lambda x: x[-1])
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highest = hits[-1][-1]
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print("highest", highest)
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print("hits", len(hits))
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if __name__ == "__main__":
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main()
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