백준 알고리즘 23794번 : 골뱅이 찍기 - 정사각형

링크

https://www.acmicpc.net/problem/23794

sol1) 구현

#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#define fastio ios::sync_with_stdio(0), cin.tie(0), cout.tie(0)
#define int int64_t
using namespace std;

int32_t main(){
  fastio;
  int n; cin >> n;
  for(int i = 1; i <= n + 2; i++){
    for(int j = 1; j <= n + 2; j++){
      if(i == 1 || i == n + 2 || j == 1 || j == n + 2) cout << "@";
      else cout << ' ';
    }
    cout << "\n";
  }
}