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Starry NightIOI 98High up in the night sky, the shining stars appear in clusters of various shapes. Aclusteris a non-empty group of neighbouring stars... 阅读全文
posted @ 2015-11-15 16:49
albertxwz
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Fencing the CowsHal BurchFarmer John wishes to build a fence to contain his cows, but he's a bit short on cash right. Any fence he builds must contain... 阅读全文
posted @ 2015-11-15 16:41
albertxwz
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