Submission

Score: 100

User: sakuragichan

Problemset: อนุกรม

Language: cpp

Time: 0.002 second

Submitted On: 2026-09-05 22:44:02

#include <iostream>
using namespace std;

int main() {
    long long n, n1 = 1, n2 = 1, x = 0;
    cin >> n;
    if (n == 1 || n == 2) {
        cout << 1;
        return 0;
    }
    else {
        for (int i = 3; i <=n; i++) {
            x = n1;
            n1 += n2;
            n2 = x;
        }
    }
    cout << n1;
    return 0;
}