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package ds
import (
"fmt"
"math/rand"
"strings"
)
type ArrayList []int
func NewRandomArrayList(l, max int) ArrayList {
a := make(ArrayList, l)
for i := 0; i < l; i++ {
if max > 0 {
a[i] = rand.Intn(max)
continue
}
a[i] = rand.Int()
}
return a
}
func NewAscendingArrayList(l int) ArrayList {
a := make(ArrayList, l)
for i := 0; i < l; i++ {
a[i] = i
}
return a
}
func NewDescendingArrayList(l int) ArrayList {
a := make(ArrayList, l)
j := l - 1
for i := 0; i < l; i++ {
a[i] = j
j--
}
return a
}
func (a ArrayList) FirstN(n int) string {
var sb strings.Builder
j := n
l := len(a)
if j > l {
j = l
}
for i := 0; i < j; i++ {
fmt.Fprintf(&sb, "%v ", a[i])
}
if j < l {
fmt.Fprintf(&sb, "... ")
}
return sb.String()
}
func (a ArrayList) Sorted() bool {
for i := len(a) - 1; i > 0; i-- {
if a[i] < a[i-1] {
return false
}
}
return true
}
func (a ArrayList) Swap(i, j int) {
aux := a[i]
a[i] = a[j]
a[j] = aux
}
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