sort函数的例子

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

void elimDup(vector<string> &words)
{
　　//按字典序排列
    sort(words.begin(),words.end());
　　//消除重复的字符串
    auto end_unique=unique(words.begin(),words.end());
　　//删除多余的字符串
    words.erase(end_unique,words.end());
}

bool isShorter(const string &s1,const string &s2)
{
    return s1.size()<s2.size();
}
int main()
{
    vector<string> v2={"a","a","dfd","fd","a","df"};
    elimDup(v2);
    for(auto vv:v2)
        cout<<vv<<" ";
    cout<<endl;
　　//按长度排序之后，保持字典序
    stable_sort(v2.begin(),v2.end(),isShorter);
    for(auto vv:v2)
        cout<<vv<<" ";
    cout<<endl;
    return 0;
}

a df dfd fd 
a df fd dfd