link: https://play.golang.org/p/XS9sBvENf2Y
package main
import "fmt"
func main() {
result := find_averages_of_subarrays(5, []float64{1, 3, 2, 6, -1, 4, 1, 8, 2})
fmt.Printf("Averages of subarrays of size K: %v", result)
}
func find_averages_of_subarrays(K int, arr []float64) []float64 {
var result []float64
sum, start := 0.0, 0
for end := range arr {
sum += arr[end]
if end < K-1 {
continue
}
result = append(result, sum/float64(K))
sum -= arr[start]
start += 1
}
return result
}