Submission

Score: 100

User: kimza

Problemset: อนุกรม

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-08 22:49:39

#include <iostream>
using namespace std;
int main() {
    unsigned long long n;
    unsigned long long a = 1;
    unsigned long long b = 1;
    unsigned long long c = 0;
    cin >> n;
    if(n == 1){
        cout << 1;
    }
    else if(n==2){
        cout << 1;
    }
    else{
        for(unsigned long long i = 0;i<n-2;i++){
            c = a+b;
            a = b;
            b = c;
        }
        cout << c;
    }
    
    
    return 0;
}