sortline.cpp

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#include <iostream>
#include <fstream>
#include <string>
#include <set>
 
typedef std::set<std::string> StrSet;
 
int main()
{
    StrSet ss;
    std::string line;
    while (std::getline(std::cin, line)) {
        if (!line.empty() && line[line.size() - 1] == '\n') {
            line.resize(line.size() - 1);
        }
        if (!line.empty()) {
            ss.insert(line);
        }
    }
    for (StrSet::const_iterator i = ss.begin(), ie = ss.end(); i != ie; ++i) {
        std::cout << *i << std::endl;
    }
}