摘要：
Problem DescriptionOverpower often go to the playground with classmates. They play and chat on the playground. One day, there are a lot of stars in the sky. Suddenly, one of Overpower’s classmates ask him: “How many acute triangles whose inner angles are less than 90 degrees (regarding stars as poin 阅读全文
posted @ 2013-09-24 21:06
forevermemory
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