题目网址: http://www.puzzleup.com/2016/
http://www.puzzleup.com/2016/puzzle/?20
答题时限: 12月９日７ＰＭ－比赛结束
加分时限: 12月９日７ＰＭ－12月14日６：５９ＰＭ
答对可得基本分１００分。答案可上传５次，每改１次答案从基本分扣２０分。
比赛期间内可随时上传答案，加分时限内答对第ｎ天加（６－ｎ）分
另依题目的难易有额外加分（如有８０％的人这题答错，答对者加８０分）
◆EXPRESSION
Using the 10 digits (0,1,2,3,4,5,6,7,8,9), four arithmetic operations
("+","-", "x", " /"), exponentiation ("^"), factorial ("!"), decimal point
("."), and one pair of parentheses exactly one time, form an expression with
maximum possible result.
Example:
(2.3/1-0+4x65)^789!
Notes:
- Order of operations: 1.(Factorial), 2.(Exponent), 3.(Multiplication and
Division), 4.(Addition and Subtraction). Expressions inside the parentheses
should be evaluated first.
- The signs "+", and "-" can be used only for addition and subtraction
operations (not for assigning positive or negative values to the numbers).
- The decimal point should be between two digits.
- Operations having undefined results (like division to zero) are not allowed.
使用所有数字 (0,1,2,3,4,5,6,7,8,9)、四则运算 (加 "+", 减 "-", 乘 "x", 除 "/")
、指数 ("^")、阶乘 ("!")、小数点 (".")、以及一对小括号各恰好一次，
做出一个结果最大的式子。
例子:
(2.3/1-0+4x65)^789!
注意:
* 计算顺序为: 1. 阶乘, 2. 指数, 3. 乘除, 4. 加减。括号内的式子先算。
* "+" 和 "-" 仅可用来表示加和减，不可表示正数或负数。
* 小数点必须在两个数字之间。
* 不允许式子有未定义的结果 (例如除以零等)。