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题目 In a village called Byteville, there are houses connected with N-1 roads. For each pair of houses, there is a unique way to get from one to another 阅读全文
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题目 Farmer John has arranged his N (1 ≤ N ≤ 5,000) cows in a row and many of them are facing forward, like good cows. Some of them are facing backward, 阅读全文
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题目 某售货员小T要到若干城镇去推销商品,由于该地区是交通不便的山区，任意两个城镇 之间都只有唯一的可能经过其它城镇的路线。 小T 可以准确地估计出在每个城镇停留的净收 益。这些净收益可能是负数，即推销商品的利润抵不上花费。由于交通不便，小T经过每个 城镇都需要停留，在每个城镇的停留次数与在该地的净 阅读全文
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题目 NEKO#ΦωΦ has just got a new maze game on her PC! The game's main puzzle is a maze, in the forms of a 2×n rectangle grid. NEKO's task is to lead a N 阅读全文