2019年10月8日

鸽巢原理

摘要： 2012 USAMO Problems/Problem 2 ProblemA circle is divided into 432 congruent arcs by 432 points. The points are colored in four colors such that some 1 阅读全文

posted @ 2019-10-08 17:50 Eufisky 阅读(196) 评论(0) 推荐(0) 编辑

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