Submission

Score: 100

User: Bentley

Problemset: อนุกรม

Language: cpp

Time: 0.005 second

Submitted On: 2026-10-08 21:16:44

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

int main() 
{
    long long n,a=1,b=1,c=1; cin >> n;
    if(n<=0){
        cout << 0;
        return 0;
    }
    for(int i=0;i<n-2;i++){
        a=b+c;
        b=c;
        c=a;
    }
    cout << a;
    return 0;
}