ex11_32.cpp

//
//  ex11_32.cpp
//  Exercise 11.32
//
//  Created by pezy on 12/17/14.
//
//  Using the multimap from the previous exercise, write a program to print the list of **authors and their works** alphabetically.

#include <map>
#include <set>
#include <string>
#include <iostream>

using std::string;

int main()
{
    std::multimap<string, string> authors{
        { "alan", "DMA" },
        { "pezy", "LeetCode" },
        { "alan", "CLRS" },
        { "wang", "FTP" },
        { "pezy", "CP5" },
        { "wang", "CPP-Concurrency" }
    };
    std::map<string, std::multiset<string>> order_authors;
    for (const auto &author : authors)
        order_authors[author.first].insert(author.second);
    for (const auto &author : order_authors) {
        std::cout << author.first << ": ";
        for (const auto &work : author.second)
            std::cout << work << " ";
        std::cout << std::endl;
    }
}