来点益智题给群友换换脑子，小学奥数难度吧，非常 intuitive
An eccentric billionaire has bought a group of islands somewhere in the Pacific, and is using them to raise (and thus preserve) some colonies of rare animal species. He has fenced each of these islands, dividing them into separate regions surrounded by fences, each of which houses exactly one of the species (all different). Each fence consists of sections that run between two fenceposts; any fencepost can be a terminus of any number of sections. The fences on each individual island are connected together. The total number of fenceposts on all the islands is 1000, with 1500 sections, enclosing 510 species. How many islands are there?
An eccentric billionaire has bought a group of islands somewhere in the Pacific, and is using them to raise (and thus preserve) some colonies of rare animal species. He has fenced each of these islands, dividing them into separate regions surrounded by fences, each of which houses exactly one of the species (all different). Each fence consists of sections that run between two fenceposts; any fencepost can be a terminus of any number of sections. The fences on each individual island are connected together. The total number of fenceposts on all the islands is 1000, with 1500 sections, enclosing 510 species. How many islands are there?
室友说 jaist 合格発表通知仅通过邮递通知书，不会在官网和 email 发布，也不支持 email 查询
这太他妈典了哈哈哈哈，2021 年日本还有这样的学校
这太他妈典了哈哈哈哈，2021 年日本还有这样的学校