Submission

Score: 100

User: Alif_Sama

Problemset: มุมขวาบน

Language: cpp

Time: 0.003 second

Submitted On: 2025-10-11 11:03:03

#include <iostream>
using namespace std;

int main()
{
    int n;
    cin >> n;
    bool l = 0;
    int a, b;
    for (int k = 0; (2 * k - 2) * (2 * k - 1) - 1 <= n; k++)
    {
        if ((2 * k - 2) * (2 * k - 1) - 1 == n)
        {
            l = 1;
        }
    }
    if (l == 1)
    {
        cout << "Cannot find top-right corner.";
        return 0;
    }
    for (int k = 0; (2 * k - 2) * (2 * k - 1) <= n; k++)
    {
        a = (2 * k - 2) * (2 * k - 1);
    }
    for (int k = 0; (2 * k - 2) * (2 * k - 1) + 1 <= n; k++)
    {
        b = (2 * k - 2) * (2 * k - 1) + 1;
    }
    cout << max(a, b);
}