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| string Solution::fractionToDecimal(int a, int b) {
bool sign = true;
long long A = a, B = b;
if(1ll * A * B < 0) sign = false;
A = abs(A), B = abs(B);
long long pos = A / B, id = 0;
A = A % B;
if(A == 0) return (sign ? "" : "-") + to_string(pos);
map<pair<int,int>, int> hash;
string prime = "";
while(A) {
A *= 10;
long long rem = A % B;
long long div = A / B;
if(hash.count({rem,div})) {
prime = prime.substr(0,hash[{rem,div}]) + "(" + prime.substr(hash[{rem,div}]) + ")";
A = 0;
} else {
hash[{rem,div}] = id++;
prime.push_back(div | 0b110000);
A = rem;
}
}
return (sign ? "" : "-") + to_string(pos) + "." + prime;
}
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