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Problem 1004
反射N次回到起点,在反射的N次过程中还能不能再次经过起点?
13110581086
| 2015-09-05 20:08:17
Author
也就是经过起点 >=2次
admin
| 2015-09-05 20:08:52
# 1
光线反射N次后首次回到起点
13110581086
| 2015-09-05 20:09:19
# 2
哦哦
rt
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