Submission

Score: 100

User: Visaaxolotl

Problemset: อนุกรม

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-08 19:32:19

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


int fibonacci(int n){
    if (n <= 0) return 0;
    if (n == 1) return 1;
    if (n == 2) return 1;

    int a = 1, b = 1, sum = 0;
    for (int i = 3; i <= n; i++) {
        sum = a + b;
        a = b;
        b = sum;
    }
    return sum;
}


signed main() {
    int c; cin >> c;
    cout << fibonacci(c);
}