Exer10_11.cpp

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <algorithm>
#include <iterator>
using std::cout;
using std::cerr;
using std::endl;
using std::ifstream;
using std::string;
using std::vector;
inline bool isShorter(const string &s1, const string &s2)
{
    return s1.size() < s2.size();
}
void elimDups(vector<string> &words)
{
    sort(words.begin(), words.end());
    auto end_unique = unique(words.begin(), words.end());
    for(const auto &s : words)
        cout << s << " ";
    cout << endl;
    words.erase(end_unique, words.end());
}
vector<string>::iterator elimDups(vector<string>::iterator beg, vector<string>::iterator end)
{
    sort(beg, end);
    auto end_unique = unique(beg, end);
    return end_unique;
}
int main(int argc, char* argv[])
{
    if(argc != 2)
    {
        cerr << "Wrong input argument." << endl;
        return -1;
    }
    ifstream is(argv[1]);
    string word;
    vector<string> text;
    while(is >> word)
    {
        text.push_back(word);
    }
    vector<string>::size_type part= text.size() > 50 ? 50 : text.size();
    for(auto iter = text.begin(); iter != text.begin() + part; ++iter)
        cout << *iter << " ";
    cout << "\n" << endl;
    auto end_unique = elimDups(text.begin(), text.begin() + part);
    text.erase(end_unique, text.end());
    for(auto iter = text.begin(); iter != end_unique; ++iter)
        cout << *iter << " ";
    cout << "\n" << endl;
    stable_sort(text.begin(), text.end(), isShorter);
    for(auto iter = text.begin(); iter != end_unique; ++iter)
        cout << *iter << " ";
    cout << "\n" << endl;
    return 0;
}