以下代码的输出结果是为：#include<iostream>#include<vector>#include<algoritm>using namespace std; void push(vector<int>& v){ int i = 4; for(; i>0; i--) v.push_back(i);} void sort(vector<int> v){ sort(v.begin(),v.end());} void disp(vector<int> v){ for (int i=0; i<v.size(); i++) cout<< v[i];} int main(){ vector<int> y; push(v); disp(v); sort(v); disp(v); return 0;}