exercise14_40.cpp

#include <vector>
#include <string>
#include <iostream>
#include <algorithm>

using namespace std;

class ShorterString
{
public:
	bool operator()(string const& s1, string const& s2) const { return s1.size() < s2.size(); }
};

class BiggerEqual
{
	size_t sz_;
public:
	BiggerEqual(size_t sz) : sz_(sz) {}
	bool operator()(string const& s) { return s.size() >= sz_; }
};

class Print
{
public:
	void operator()(string const& s) { cout << s << " "; }
};

string make_plural(size_t ctr, string const& word, string const& ending)
{
	return (ctr > 1) ? word + ending : word;
}

void elimDups(vector<string> &words)
{
	sort(words.begin(), words.end());
	auto end_unique = unique(words.begin(), words.end());
	words.erase(end_unique, words.end());
}

void biggies(vector<string> &words, vector<string>::size_type sz)
{
	elimDups(words);
	stable_sort(words.begin(), words.end(), ShorterString());
	auto wc = find_if(words.begin(), words.end(), BiggerEqual(sz));
	auto count = words.end() - wc;
	cout << count << " " << make_plural(count, "word", "s") << " of length " << sz << " or longer" << endl;
	for_each(wc, words.end(), Print());
	cout << endl;
}

int main()
{
	vector<string> vec{ "fox", "jumps", "over", "quick", "red", "red", "slow", "the", "turtle" };
	biggies(vec, 4);
}