Fraction to recurring Decimal

Given integers representing the numerator and denominator of a fraction, return the fraction in string format.

If the fractional part was 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) ".

Analyse:use Hash to store the fractional and its corresponding position at result. If The fractional has occurred, the result is recurring; If The fractional is 0, return to current result.

Runtime:0ms.

1 classSolution {2  Public:3     stringFractiontodecimal (intNumerator,intdenominator) {4         if(!numerator)return "0";5         6         stringresult;7unordered_map<int,int>um;8         if(Numerator <0^ Denominator <0) Result + ='-';9         Long Long intNu = numerator, de =denominator;TenNu =abs (NU); OneDe =abs (DE); A          -Result + = To_string (Nu/de); -         Long Long intFractional = nu%de; the         if(!fractional)returnresult; -Result + ="."; -          -          while(fractional) { +             //find if the fractional is in UM -             if(Um.find (fractional)! =Um.end ()) { +Result.insert (Um[fractional],"("); AResult + =")"; at                 returnresult; -             } -              -             //Push the fractional and its position in result into UM -Um[fractional] =result.length (); -              inFractional *=Ten; -Result + = to_string (Fractional/de); toFractional%=de; +         } -         returnresult; the     } *};

Fraction to recurring Decimal