ex11_32.cpp

//
//  ex11_32.cpp
//  Exercise 11.32
//
//  Created by pezy on 12/17/14.
//  Copyright (c) 2014 pezy. All rights reserved.
//
//  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;
    }
}