Submission

Score: 100

User: ztmy_

Problemset: อนุกรม

Language: cpp

Time: 0.003 second

Submitted On: 2025-10-08 09:28:01

#include <iostream>
using namespace std;

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