HDU2070 斐波那契 水题

#include<stdio.h>int main(){    __int64 s[55];    int n,i;    s[0] = 0;    s[1] = 1;    for(i = 2;i <= 50;i++)    s[i] = s[i-1] + s[i-2];    scanf("%d",&n);    {        printf("%I64d\n",s[n]);    }    return 0;}