Submission

Score: 100

User: msurirak

Problemset: อนุกรม

Language: cpp

Time: 0.005 second

Submitted On: 2026-09-21 09:53:34

#include<iostream>
#include<string>
using namespace std;
int main(){
    long long back=1,num,front=1,in=1;
    cin>>num;
    for(int i = 0;i < num-2;i++){
        in=back;
        back=front;
        front=back+in;
//      cout<<front<<" ";
    }
    cout<<front;
}