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小红最近喜欢和朋友一起玩弹珠,他现在想研究一下弹珠的行走轨迹,以此来提高自己和朋友一起玩弹珠的时候的胜率。
当弹珠撞到墙的时候会发生反弹,方向发生改变,参考下图:
In following contests:
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