Submission

Score: 100

User: opjns

Problemset: อนุกรม

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-13 21:49:33

#include <iostream>
using namespace std;
int main () {
    int n;
    cin >> n;
    long long result;
    long long t1=0,t2=1,t3=0;
    if(n<1||n>90){
        return 0;
    }
    if(n==1){
        cout << "1";
        return 0;
    }
    for(int i=1;i<n;i++){
        t3 = t1+t2;
        t1 = t2;
        t2 = t3;
    }
    cout << t3;
    return 0;
}