Submission

Score: 100

User: Quinruj

Problemset: อนุกรม

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-02 16:41:04

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

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

    int n;cin>>n;
    ll a = 1;
    ll b = 1;
    if (n <= 2){
        cout << 1;
        return 0;
    }
    n-=2;
    while (n--){
        ll temp = a+b;
        a = b;
        b = temp;
    }
    cout << b;
}