[백준] 2193번 : 이친수 - C

https://www.acmicpc.net/problem/2193

#include<stdio.h>
int main() {
    int n;
    scanf("%d",&n);
    long arr[n+1];
    arr[0]=0;
    arr[1]=1;
    for(int i=2;i<=n;i++){
        arr[i]=arr[i-1]+arr[i-2];
    }
    printf("%ld",arr[n]);
}