Submission

Score: 100

User: Patn01Z

Problemset: มุมขวาบน

Language: cpp

Time: 0.005 second

Submitted On: 2026-10-13 18:54:23

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

int main(){
    int N;
    cin >> N;

    int top =1;
    vector<int> rt;
    rt.push_back(1);
    int i=2;
    while(rt.back()<N){
        int temp=4*i*i-6*i+3;
        rt.push_back(temp);
        i++;
    }

    if(N==rt.back()-1){
        cout << N;
    }
    else if(N==rt.back()-2){
        cout << "Cannot find top-right corner.";
    }
    else if(N==rt.back()){
        cout << N;
    }
    else{
        cout << rt[rt.size()-2];
    }
    return 0;
}