题目网址: http://www.puzzleup.com/2018/
http://www.puzzleup.com/2018/puzzle/?2
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◆LETTER COUNT
The letter count of a number is defined as the number of letters in English
spelling of that number. Letters in linking words such as 'and' are not
counted. Find the largest number having these properties:
-Its letter count is same as sum of the letter counts of each of its digits.
-No digit is used more than twice.
-Does not start with zero.
Exampe: 5010
"FIVE THOUSAND TEN" has 15 letters.
"FIVE ZERO ONE ZERO" has 15 letters.
一个数字的字母量定义为其英文拼法的字母数量。用于单字连接词之字母如'and'不算。
试寻满足以下三个条件之最大数字：
-其字母量等同于每个位数字母量之和。
-每位数字出现不超过两次。
-不得以零开头。
范例： 5010
"FIVE THOUSAND TEN" 有十五个字母。
"FIVE ZERO ONE ZERO" 有十五个字母。