Loops

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define double long double
#define endl '\n'
#define fastio ios_base::sync_with_stdio(0); cin.tie(0)

signed main()
{
    fastio;
    /*
    int n;
    cin >> n;
    for(int i = 1; i <= n; i++){
        cout << i << " OK\n";
    }



    int i = 1;
    while(i <= n){
        cout << i << " OK\n";
        i++;
    }
    */
    /*
    // B
    int a , b;
    cin >> a >> b;
    for(int i = a; i <= b; i++){
        if(i % 2) // tek
            cout << i << " ";
    }
    */
    /*
    // C
    int a , b;
    cin >> a >> b;
    for(int i = b; i >= a; i--){
        if(i % 2 == 0)
            cout << i << " ";
    }
    */
    /*
    int n;
    cin >> n;
    while(n--){ // n defe
        cout << "0";
        cout << "1";
    }
    */
    /*
    int a , b;
    cin >> a >> b;
    for(int i = a; i <= b; i++)
        cout << i << " ";

    int i = a;
    while(i <= b){
        cout << i << " ";
        i++;
    }
    */
    /*
    int n;
    cin >> n;
    int i = n;
    while(i >= 0){
        cout << i << " sek" << '\n';
        i--;
    }
    */
    /*
    int n;
    cin >> n;
    for(int i = 2; i < n; i *= 2){
        cout << i << " ";
    }
    */
    /*
    int n;
    cin >> n;
    for(int i = 1; i <= n; i++){
        cout << i * i << " ";
    }
    */
    /*
    int n;
    cin >> n;
    for(int i = 1; i * i * i < n; i++){
        cout << i * i * i << " ";
    }

    int i = 1;
    while(i * i * i < n){
        cout << i * i * i << " ";
        i++;
    }
    */
    /*
    int n;
    cin >> n;
    for(int i = 1; i <= n; i++)
        cout << i << " ";

    */
    /*
    int n;
    cin >> n;
    for(int i = 1; i <= n; i++)
        cout << i * 2 - 1 << " ";
    */

}