Məsələlər
158
#include <bits/stdc++.h> //including necessary libraries
using namespace std; //using std
int main(){ //main code function start
ios_base::sync_with_stdio(false); //speeding up the code
cin.tie(NULL); //speeding up the code
int m, n; //amount of elements and element
cin>>m; //get the amount of elements
vector<int> vec; //main vector
vector<int> res; //result vector
for(int i = 0; i < m; i++){ //start filling the vector
cin>>n; //get the element
vec.push_back(n); //add the element to the vector
} //stop filling the vector with elements
for(int i = 0; i < m; i++){ //start checking process
if(i % 2 != 0){ //check if the index of the element is odd
res.push_back(vec[i]); //if it is, add the element to the result vector
} //stop checking
else{ //if the index of the element is even
continue; //continue checking and do nothing
} //stop the else condition
} //stop checking process
if(res.empty()){ //check if the result vector is empty
cout<<"NO"<<endl; //if it is empty, print "NO"
} //stop checking if the result vector is empty
else{ //if the result vector is not empty
cout<<res.size()<<endl; //print the amount of elements in the result vector
for(int i = 0; i < res.size(); i++){ //start printing the elements of the result vector
cout<<res[i]<<" "; //print the element
} //stop printing the elements of the result vector
} //stop the else condition
return 0; //speeding up the code
} //main function code end
include<iomanip>
include<iostream>
include<cmath>
using namespace std; int main() { long long n,m,f=0; cin>> n; long long a[n]; for(int i=0;i<n;i++){ cin>> m; a[i]=m; } for(int i=0;i<n;i++){ if(i%2!=0){ f=f+1;}} if(f==0){ cout << "NO";} else{ cout <<f<<endl; for(int i=0;i<n;i++){ if (i%2!=0){ cout <<a[i]<<" ";}} }}