Submission

Score: 100

User: anonymous

Problemset: อนุกรม

Language: cpp

Time: 0.004 second

Submitted On: 2026-09-30 21:42:36

#include <bits/stdc++.h>

using namespace std;

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

    long long a = 1, b = 1;

    if (n == 1 || n == 2)
    {
        cout << 1;
    }
    else
    {
        for (int i = 3; i <= n; i++)
        {
            long long c = a + b;
            a = b;
            b = c;
        }

        cout << b;
    }
}