class Solution {public:    string fractionToDecimal(int numerator, int denominator) {        int sign1 = numerator >= 0 ? 1 : -1;        int sign2 = denominator >= 0 ? 1 : -1;        long long num = (long long)numerator;        long long den = (long long)denominator;        num = abs(num);        den = abs(den);        long long d = num / den;        long long rem = num % den;        unordered_map<long long, int> rec;        string ans = to_string(d);        if (sign1 * sign2 == -1 && (d > 0 || rem > 0)) ans = "-" + ans;        if (rem == 0) return ans;        ans = ans + ".";        string r = "";        for (int pos = 0; rem != 0; pos++) {            if (rec.find(rem) != rec.end()) {                r.insert(rec[rem], "(");                r = r + ")";                return ans + r;            }            rec[rem] = pos;            r = r + to_string((rem * 10) / den);            rem = (rem * 10) % den;        }        return ans + r;    }};