#include <iostream>
#include <vector>
#include <unordered_map>
#include <string>

using namespace std;

int priceCheck(const vector<string>& products,
               const vector<double>& productPrices,
               const vector<string>& productSold,
               const vector<double>& soldPrices) {

    // Step 1: Map product names to correct prices
    unordered_map<string, double> priceMap;
    for (size_t i = 0; i < products.size(); ++i) {
        priceMap[products[i]] = productPrices[i];
    }

    // Step 2: Compare each sold item price with correct price
    int errorCount = 0;
    for (size_t i = 0; i < productSold.size(); ++i) {
        string soldProduct = productSold[i];
        double correctPrice = priceMap[soldProduct];
        if (abs(correctPrice - soldPrices[i]) > 1e-6) {
            ++errorCount;
        }
    }

    return errorCount;
}
int main() {
    vector<string> products = {"eggs", "milk", "cheese"};
    vector<double> productPrices = {2.89, 3.29, 5.79};
    vector<string> productSold = {"eggs", "eggs", "cheese", "milk"};
    vector<double> soldPrices = {2.89, 2.99, 5.97, 3.29};

    int errors = priceCheck(products, productPrices, productSold, soldPrices);
    cout << "Number of pricing errors: " << errors << endl;

    return 0;
}