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题目：Given an integer, convert it to a roman numeral.Input is guaranteed to be within the range from 1 to 3999.Subscribe to see which companies asked this question整数转为罗马数字： 参照罗马数字转整数的规则，可在罗马数字与整数之间建立一个映

题目Convert a non-negative integer to its english words representation. Given input is guaranteed tobe less than 231 - 1.For example,123 -> “One Hundred Twenty Three”12345 -> “Twelve Thousand Three Hundr