ClassSaleVectorSetSearch

#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <list>
#include <cmath>
#include <algorithm>
#include <map>
#include <set>

using namespace std;

class Sale {
    std::string m_town, m_product = "";
    double m_price = 0.0;
    int m_quantity = 0;
public:
    Sale();
    Sale(std::string &town, std::string &product, double &price, int &quantity) {
        m_town = town;
        m_product = product;
        m_price = price;
        m_quantity = quantity;
    }

    std::string getTownName() const {
        return m_town;
    }

    double sumProduct() {
        return m_price * m_quantity;
    }

    bool operator< (const Sale &right) const {
        return m_town < right.m_town;
    }

    bool operator== (const Sale &right) const {
        return this->m_town == right.m_town;
    }
};


int main() {
    int numCities = 0;
    std::string town = "";
    std::string product = "";
    double price = 0.0;
    int quantity = 0;
    std::vector<Sale> saleV;
    std::set<Sale> saleS;
    cout.setf(ios::fixed);
    cout.precision(2);

    cin.setf(ios::fixed);
    cin.precision(2);

    cin >> numCities;

    while(std::cin >> town && std::cin >> product && std::cin >> price && std::cin >> quantity && numCities != 0) {
        Sale s(town, product, price, quantity);

        saleV.push_back(s);
        saleS.insert(s);

        --numCities;
        if(numCities == 0) {
            break;
        }
    }

    double sum = 0.0;

    //sort(saleV.begin(), saleV.end());

    for(auto it = saleS.begin(); it != saleS.end(); ++it) {
        std::string temp = it->getTownName();
        std::vector<Sale>::iterator iter = saleV.begin();
        sum = 0.0;
        while((iter = std::find(iter, saleV.end(), *it)) != saleV.end())
        {
            sum += iter->sumProduct();
            iter++;
        }
        cout << it->getTownName() << " -> " << sum;
        cout << endl;
    }

    return 0;
}