Submission

Score: 100

User: Phi

Problemset: อนุกรม

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-13 21:30:58

#include <bits/stdc++.h>
long long int recur(long long int s,long long int b,int n){
    if (n==0){
        return b;
    }
    if (n<0) return 1;
    else{
        return recur(b,s+b,n-1);
    }
}
int main(){
    int n;
    std::cin>>n;
    if (n<=0) return 0;
    std::cout<<recur(1,1,n-2);
}