Submission

Score: 90

User: Mano

Problemset: อนุกรม

Language: cpp

Time: 0.003 second

Submitted On: 2025-10-03 10:57:29

#include<iostream>
using namespace std;
int main(){
    long long a=1,b=1,c;
    int x;
    cin>>x;
    if(x>=90){
        cout<<"error";
        return 0;
    }
    if(x==1 || x==2){
        cout<<"1";
        return 0;
    }
    for(int i=3;i<=x;i++){
        c=a;
        a=a+b;
        b=c;
    }
    cout<<a;
    return 0;
}