奇怪的现象

#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;




 bool isShorter (const string&s1,const string&s2)

 {
     return s1.size()<s2.size();

 }

 bool GT6(const string &s)

 {return s.size()>=6;}

 

 string make_plural(    size_t t, const string&word,const string&ending){
     
     return t==1?word:word+ending;

 }

 

 

 int main(){
    string x;
    vector<string>vec;
    while(cin>>x){
    vec.push_back(x);
        
    }
    sort(vec.end(),vec.end());
    vector<string>::iterator end_unique=
    unique(vec.begin(),vec.end());
    vec.erase(end_unique,vec.end());
    stable_sort(vec.begin(),vec.end(),isShorter);
    vector<string>::size_type wc=count_if(vec.begin(),vec.end(),GT6);
    cout<<wc<<" "<<make_plural(wc,"word","s")<<
    "6 characters or longer"<<endl;
   
    vector<string>::iterator it=vec.begin();
    for(;it!=vec.end();++it)
    cout<<*it<<" ";
   
    return 0;
}