Challenge QuintoAndar

reducereven.go

package main

import (
	"fmt"
)

func main() {
	A := []int{0, 3, 3, 7, 5, 3, 11, 1}

	B := []int{0, 3, 0, 7, 0, 0, 11, 0}

	C := []int{80, 80, 1000000000, 80, 80, 80, 80, 80, 80, 123456789}

  fmt.Println("reduce", reduce(A))
	fmt.Println("reduce", reduce(B))
	fmt.Println("reduce", reduce(C))
}

func reduce(arr []int) int {
	mapper := map[uint64]uint64{}

	for _, k := range arr {
		if k%2 == 0 {
			mapper[uint64(k)] = uint64(k)
		}
	}
	return len(mapper) + 1
}