ring

ring.go

package main

import (
	"container/ring"
	"fmt"
	"strconv"
)

func main() {

	// should produce 6
	// length of length of arr / 2 = number of steps forward
	// if pos i equal to pos + steps forward ad it to sum
	a := "1212"
	sum := 0
	length := len(a)
	r := ring.New(length)
	steps := length / 2

	for _, val := range a {
		v, _ := strconv.Atoi(string(val))
		r.Value = v
		r = r.Next()
	}

	for i := 0; i < r.Len(); i++ {
		a := r.Move(steps)
		if r.Value == a.Value {
			intval := r.Value.(int)
			sum += intval
		}
		r = r.Next()
	}
	fmt.Println(sum)

}