洛谷 P1876 开灯

题目链接：https://www.luogu.com.cn/problem/P1876

#include <iostream>

using namespace std;

typedef long long ll;

int main()
{
    ll n;
    cin >> n;
    
    for (int i = 1; (ll)i * i <= n; i++)
    {
        cout << (ll)i * i << " ";
    }
    
    return 0;
}