C++,最短代码，进来学知识

#include <iostream>
#include <algorithm>
#include <vector>
#include <iterator>
using namespace std;
int main(){
    int n,k;
    while(cin>>n>>k){
        vector<int> vec(n);
        for(int i=0;i<n;++i)
            cin>>vec[i];
        partial_sort(vec.begin(),vec.begin()+k,vec.end());
        copy(vec.begin(),vec.begin()+k,ostream_iterator<int>(cout," "));
        cout<<endl;
    }
}