How to output vector in c++ using nvim(vim)?

Question

I write the code which normally should output the vector, however, when i compile the code succesefully, and therefore call ./test nothing appears.The same works for other's programs(containing vector) compiled on my computer.

'''

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


void function(const vector<int> &vec){
    vector<pair<int,int>>result;
    vector<int> sorted_vec;
    sorted_vec = vec;
    sort(sorted_vec.begin(),sorted_vec.end());
    for(int i=0;i<sorted_vec.size();i++){
        for(int j=0;j<sorted_vec.size();++j){
            if(sorted_vec[i]+2==sorted_vec[j]){
                pair<int,int> p;
                p = make_pair(sorted_vec[i],sorted_vec[j]);
                result.push_back(p);
            }
        }
    }
    for(int i=0;i<result.size();++i){
        cout<<result[i].first<<result[i].second<<" ";
    }
    cout<<endl;
}


int main(){
    vector<pair<int,int>> x = {2,4,1,3,5,7};
    vector<pair<int,int>> function(const vector<int> x);
    return 0;
}

'''

question from:https://stackoverflow.com/questions/65875899/how-to-output-vector-in-c-using-nvimvim

Answer 1

Waitting for answers