Submission

Score: 100

User: snadwixh

Problemset: อนุกรม

Language: cpp

Time: 0.004 second

Submitted On: 2026-09-25 10:00:45

#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main() {
    int a;
    long long ar[91];
    cin >> a;
    if (a == 0) {
        return 0;
    }
    if (a > 90) {
        return 0;
    }
    for (int i = 1; i <= a; i++) {
        if (i == 1) {
            ar[0] = 1;
            ar[1] = 1;
        }
        if (i >= 2) {
            ar[i] = ar[i-1]+ar[i-2];
        }
    }
    if (a<=90) {
        cout << ar[a-1];
    }

}