Submission

Score: 100

User: fishia

Problemset: อนุกรม

Language: cpp

Time: 0.005 second

Submitted On: 2026-10-13 19:35:39

#include<iostream>
using namespace std;
int main(){
	long long now, prev1=1, prev2=1,x;
	cin>>x;
	if(x==1||x==2){
		cout<<1;
		return 0;
	}
	for(int i=0;i<x-2;i++){
		now=prev1+prev2;
		prev1=prev2;
		prev2=now;
	}
	cout<<now;
}