Submission

Score: 25

User: Kidmaiok

Problemset: มุมขวาบน

Language: cpp

Time: 0.003 second

Submitted On: 2025-10-07 09:57:17

#include<bits/stdc++.h>
using namespace std;
int main() {
    long long n;
    cin >> n;

    long long i = 1;
    while (i * i < n) i += 2; // find smallest odd square >= n

    long long topRight = i * i - (i - 1);

    if (topRight <= n)
        cout << topRight;
    else
        cout << "Cannot find top-right corner.";
}