先输入正整数n，（n代表采购商品的种类），再输入n种商品的商品名、生产商、采购日期、采购数量、单价，然后根据输入的日期，统计此时间段内各个生产商的采购总价及采购清单（采购清单按生产商和时间顺序由小到大排列）。
【输入形式】7
PC DELL 20180112 1 10000.00
PC HP 20180918 3 9000.00
DISPLAYER DELL 20180505 2 6000.00
ROUTER HUAWEI 20181130 5 8000.00
PC HUAWEI 20180315 2 8400.00
SERVER DELL 20180228 3 9200.00
DISPLAYER HP 20181011 1 3200.00
20180101 20181130
【输出形式】
PC DELL 20180112 1 10000.00 10000.00
SERVER DELL 20180228 3 9200.00 27600.00
DISPLAYER DELL 20180505 2 6000.00 12000.00
DELL 49600.00
PC HP 20180918 3 9000.00 27000.00
DISPLAYER HP 20181011 1 3200.00 3200.00
HP 30200.00
PC HUAWEI 20180315 2 8400.00 16800.00
ROUTER HUAWEI 20181130 5 8000.00 40000.00
HUAWEI 56800.00
136600.00
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
struct Product {
std::string name;
std::string manufacturer;
std::string date;
int quantity;
double price;
};
int main() {
int n;
std::cout << "请输入商品种类数n: ";
std::cin >> n;
std::vector<Product> products;
for (int i = 0; i < n; i++) {
Product product;
std::cout << "请输入第" << i + 1 << "个商品的信息：" << std::endl;
std::cout << "商品名：";
std::cin >> product.name;
std::cout << "生产商：";
std::cin >> product.manufacturer;
std::cout << "采购日期：";
std::cin >> product.date;
std::cout << "采购数量：";
std::cin >> product.quantity;
std::cout << "单价：";
std::cin >> product.price;
products.push_back(product);
}
std::string start_date, end_date;
std::cout << "请输入需要统计的时间段（起始日期 结束日期）：";
std::cin >> start_date >> end_date;
// 统计采购总价
std::vector<std::pair<std::string, double>> total_price_by_manufacturer;
for (const auto& product : products) {
if (product.date >= start_date && product.date <= end_date) {
bool found = false;
for (auto& p : total_price_by_manufacturer) {
if (p.first == product.manufacturer) {
p.second += product.price * product.quantity;
found = true;
break;
}
}
if (!found) {
total_price_by_manufacturer.push_back(std::make_pair(product.manufacturer, product.price * product.quantity));
}
}
}
// 按照生产商和时间顺序排序
std::sort(products.begin(), products.end(), [](const Product& p1, const Product& p2) {
if (p1.manufacturer != p2.manufacturer) {
return p1.manufacturer < p2.manufacturer;
} else {
return p1.date < p2.date;
}
});
// 输出采购清单
std::cout << "采购清单：" << std::endl;
for (const auto& product : products) {
if (product.date >= start_date && product.date <= end_date) {
std::cout << product.manufacturer << "\t" << product.date << "\t" << product.name
<< "\t" << product.quantity << "\t" << product.price << std::endl;
}
}
// 输出各个生产商的采购总价
std::cout << "各个生产商的采购总价：" << std::endl;
for (const auto& p : total_price_by_manufacturer) {
std::cout << p.first << "\t" << p.second << std::endl;
}
return 0;
}