Submission

Score: 100

User: matcherbrainner

Problemset: อนุกรม

Language: cpp

Time: 0.005 second

Submitted On: 2026-10-04 09:21:51

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n<=2){
		cout<<1;
		return 0;
	}
	unsigned long long a=1;
	unsigned long long b=1;
	unsigned long long c=0;
	for(int i=3;i<=n;i++){
		c=a+b;
		a=b;
		b=c;
	}
	cout<<b;
}