Submission

Score: 100

User: qweqwe

Problemset: อนุกรม

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-08 15:59:48

#include <bits/stdc++.h>
#define speed cin.tie(0)->sync_with_stdio(0)
#define ll long long
#define pii pair<int,int>
using namespace std;

int main(){
	speed;
	int n;cin >> n;
	ll a1=1,a2=1;
	while (n>1){
		ll sum=0;
		sum+=a1;sum+=a2;
		a1=a2;a2=sum;n--;
	}cout << a1;
	return 0;
}