Submission

Score: 100

User: polikanta

Problemset: อนุกรม

Language: cpp

Time: 0.004 second

Submitted On: 2026-08-15 18:35:31

#include <stdio.h>

int main() {
    int n;
    long long a = 1, b = 1, c;

    scanf("%d", &n);

    if (n == 1 || n == 2){
        printf("1");
    } else {
        for (int i = 3; i <= n;i++){
            c = a + b;
            a = b;
            b = c;
        }
        printf("%lld", b);
    }
    return 0;
}