Fraction to Recurring Decimal
描述
Given two integers representing the numerator and denominator of a fraction, return the fraction in string format.
If the fractional part is repeating, enclose the repeating part in parentheses.
For example,
- Given numerator = 1, denominator = 2, return "0.5".
- Given numerator = 2, denominator = 1, return "2".
- Given numerator = 2, denominator = 3, return "0.(6)".
分析
这题的难点是如何找到无限循环的那一段。仔细回想一下人脑进行除法的过程，会发现，当一个余数第二次重复出现时，就说明小数点后开始无限循环了。