摘要：
Consider this sequence {1, 2, 3, . . . , N}, as a initial sequence of first N natural numbers. You canearrange this sequence in many ways. There will b... 阅读全文
摘要：
Children are always sweet but they can sometimes make you feel bitter. In this problem, you will seehow Tintin, a five year’s old boy, creates trouble ... 阅读全文
摘要：
An integer is divisible by 3 if the sum of its digits is also divisible by 3. For example, 3702 is divisibleby 3 and 12(3+7+0+2) is also divisible by ... 阅读全文