stl unique使用

#include <cstdlib>#include <iostream>#include <vector>#include <algorithm>#include <iterator>using namespace std;bool cmp(const string &str1, const string str2){ return str1 < str2;}bool gt6(const string &str){ return str.size() >= 6;}int main(int argc, char *argv[]){ freopen("input.txt", "rt", stdin); freopen("output.txt", "wt", stdout); vector<string> words; string eachWord; while(cin >> eachWord) words.push_back(eachWord); vector<string>::iterator unique_end = unique(words.begin(), words.end()); words.erase(unique_end, words.end()); stable_sort(words.begin(), words.end(), cmp); vector<string>::size_type count = count_if(words.begin(), words.end(), gt6); cout << "the count of words which size is greater than 6 is: " << count << endl; system("PAUSE"); return EXIT_SUCCESS;}