문제
풀이
#include <iostream>
using namespace std;
void solve(void) {
int n; cin >> n;
for (int i=0; i<3; i++) {
for (int j=1; j<=n; j+=2) cout << j << " ";
for (int j=2; j<=n; j+=2) cout << j << " ";
}
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
solve();
return 0;
}