Submission

Score: 50

User: Karatat007

Problemset: อนุกรม

Language: cpp

Time: 0.004 second

Submitted On: 2026-09-17 15:21:34

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

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int old = 1;
    int nw = 1;
    int n;
    cin >> n;
    if(n == 1 or n == 2){
        cout << '1';
    }
    else{
        for(int i = 1;i <= n - 2;++i){
            nw = old + nw;
            old = nw - old;
        }
        cout << nw;
    }
}