Submission

Score: 100

User: erng

Problemset: มุมขวาบน

Language: cpp

Time: 0.003 second

Submitted On: 2025-10-12 14:59:31

#include <bits/stdc++.h>
using namespace std;

long long n, c=1, k=1, pc;

int main()
{
    cin>>n;
    while(1)
    {
        if (c>=n) break;
        pc=c;
        c+=2*k;
        k++;
        c+=2*k;
        k++;

    }
    if (c-n-1==1) cout<<"Cannot find top-right corner.";
    else cout<<pc;
}