Fast Fibonacci

main.go

package main

import (
  "flag"
  "fmt"
)

var (
  N uint64
)

func init() {
  flag.Uint64Var(&N, "n", 3, "nth fibonacci number to find")
  flag.Parse()
}

// Fastest fibonacci ever.
func fib(n uint64) uint64 {var a,b,c uint64;a=1;b=1;for i:=uint64(3);i<=n;i++{c=a+b;a=b;b=c};return b}

func main() {
  fmt.Println(fib(N))
}

I challenge any Go dev to make a faster fibonacci implementation :)