Submission

Score: 100

User: speed_coding

Problemset: อนุกรม

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-04 21:01:50

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