I have a program here with a text file below the code. How can I show a output that shows the Unique Idenifiers

main.cpp:

#include <iostream>

#include <map>

#include <iterator>

#include <algorithm>

#include <string>

#include <cstdlib>

#include <fstream>

#include <sstream>

using namespace std;

string toLower(string s) {

string data = s;

std::transform(data.begin(), data.end(), data.begin(), ::tolower);

return data;

}

string trim(string str){

stringstream trimmer;

trimmer << str;

str.clear();

trimmer >> str;

return str;

}

int main()

{

map<string, int> item_count;

string line; // variable used to read a line from file

int lines =0; // variable conatining the number of transactions

ifstream myfile(“../itemdata.txt”);

if (myfile.is_open()) // checking if the file was opened

{

getline(myfile,line); // to ignore the first line which contains number of transactions

while(getline(myfile,line)) //read the file line by line until end of file is reached

{

// now we are processign each line

stringstream ss(line);

int i;

string item;

int count;

// ignore Transactions ID, #of Items

getline(ss, item, ‘,’);

getline(ss, item, ‘,’);

count = atoi(item.c_str());

while (count– && getline(ss, item, ‘,’)) {

item = trim(toLower(item));

// Now the item variable is containing the item name

map<string,int>::iterator itr = item_count.find(item);

if (itr == item_count.end() ) {

// means the element is not present

item_count.insert(pair<string,int>(item,1));

} else {

// increment the count

itr->second = 1 + itr->second;

}

}

}

// now traverse in the array and print entries which have count 1

cout << “unique items: ” << endl;

for( map<string,int>::const_iterator it = item_count.begin(); it != item_count.end(); ++it ) {

if(it->second == 1) {

cout << it->first << endl;

}

}

cout << endl << “Items frequencies: ” << endl;

for( map<string,int>::const_iterator it = item_count.begin(); it != item_count.end(); ++it ) {

cout << it->first << “:” << it->second << endl;

}

myfile.close(); //closing the file

} else{

cout << “Unable to open input file.” << endl;

return 1;

}

return 0;

}

itemdata.txt:
7 \number of transactions
1, 3, gum,bread,fish Transactions ID, #of Items, gum,bread,fish
2, 2, fish,bread
3, 1, juice
4, 3, bread, mangos fish
5, 2, bread,mangos
6, 3, Icecream,bread,fish
7, 1, fish

Please adjust the file location in ifstream myfile(“../itemdata.txt”);  line.. Otherwise program will report that it is unable to find the file.