摘要： 4981: Collatz Conjecture 题目描述 In 1978 AD the great Sir Isaac Newton, whilst proving that P is a strict superset of N P, defined the Beta Alpha Pi Zeta 阅读全文

摘要： 4990: Lemonade Trade 题目描述 The lunch break just started! Your mother gave you one litre of pink lemonade. You do not like pink lemonade and want blue l 阅读全文