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#include <iostream>
#include <string>
#include <math.h>
 
using namespace std;
 
      string fractionToDecimal(int numerator, int denominator) {
        double res = (double)numerator/denominator;
        string res_s = to_string(res);
        unordered_map<char,int> hashtable;
        int cur = 0;
        while(res_s[cur]!='.'){
            cur++;
        }
        if(cur == res_s.size()) return res_s;
        cur++;
        while(cur < res_s.size()){
            if(hashtable.find(res_s[cur]) == hashtable.end()){
                hashtable[res_s[cur]] = cur;
            }
            else{
                res_s.insert(res_s[cur],"(");
                res_s.insert(cur+1,")");
                res_s.erase(res_s.begin()+cur+2,res_s.end());
                break;
            }
            cur++;
        }
        return res_s;
    }
 
int main() {
	cout << fractionToDecimal(1,5) << endl;
 
	// your code goes here
	return 0;
}

prog.cpp: In function ‘std::string fractionToDecimal(int, int)’:
prog.cpp:9:37: error: ‘to_string’ was not declared in this scope
         string res_s = to_string(res);
                                     ^
prog.cpp:10:9: error: ‘unordered_map’ was not declared in this scope
         unordered_map<char,int> hashtable;
         ^
prog.cpp:10:23: error: expected primary-expression before ‘char’
         unordered_map<char,int> hashtable;
                       ^
prog.cpp:10:23: error: expected ‘;’ before ‘char’
prog.cpp:15:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(cur == res_s.size()) return res_s;
                              ^
prog.cpp:17:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(cur < res_s.size()){
                                ^
prog.cpp:18:16: error: ‘hashtable’ was not declared in this scope
             if(hashtable.find(res_s[cur]) == hashtable.end()){
                ^

Standard output is empty