摘要： Dreams of finding lost treasure almost came true recently. A new machine called 'The Revealer' has been invented and it has been used to detect gold w 阅读全文

摘要： In 'MonkeyLand', there is a traditional game called "Bamboo Climbing". The rules of the game are as follows: 1) There are N monkeys who play this game 阅读全文

摘要： 标题：神奇算式 由4个不同的数字，组成的一个乘法算式，它们的乘积仍然由这4个数字组成。 比如： 210 x 6 = 1260 8 x 473 = 378427 x 81 = 2187 都符合要求。 如果满足乘法交换律的算式算作同一种情况，那么，包含上边已列出的3种情况，一共有多少种满足要求的算式。 阅读全文