Finding fibionaci number in a series.c

#include <stdio.h>

long long int f[61];

long long int fib(long int n){
    if (f[n] != -1)
        return f[n];
    f[n] = fib(n - 1) + fib(n - 2);
    return f[n];
}

int main(){
    int i, j;
    long long int n;
    for (j = 0; j <= 60; j++) f[j] = -1;
    f[0] = 0;
    f[1] = 1;

    scanf("%d", &i);
    while(i--){
        scanf("%lld", &n);
        printf("Fib(%lld) = %lld\n", n, fib(n));
    }
    return 0;
}