Submission

Score: 100

User: Chita

Problemset: อนุกรม

Language: c

Time: 0.001 second

Submitted On: 2025-10-11 09:58:06

#include <stdio.h>

int main(void){
    unsigned long long a=1, b=1, sum;
    int n;
    scanf("%d", &n);
    if (n<=2){
        printf("1");
        return 0;
    }
    for (int i=0;i<n-2;i++){
        sum = a+b;
        a = b;
        b = sum;
    }
    printf("%llu", b);
    return 0;
}