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1510G.go
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1510G.go
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package main
import (
"bufio"
. "fmt"
"io"
)
// github.com/EndlessCheng/codeforces-go
func CF1510G(_r io.Reader, _w io.Writer) {
in := bufio.NewReader(_r)
out := bufio.NewWriter(_w)
defer out.Flush()
var T, n, k int
for Fscan(in, &T); T > 0; T-- {
Fscan(in, &n, &k)
fa := make([]int, n)
g := make([][]int, n)
dep := make([]int, n)
mxD := 0
for i := 1; i < n; i++ {
Fscan(in, &fa[i])
fa[i]--
g[fa[i]] = append(g[fa[i]], i)
dep[i] = dep[fa[i]] + 1
if dep[i] > mxD {
mxD = dep[i]
}
}
if k <= mxD {
mxD = k - 1
}
end := 1
for i, d := range dep {
if d == mxD {
end = i
break
}
}
onPath := make([]bool, n)
for v := end; v > 0; v = fa[v] {
onPath[v] = true
}
Fprintln(out, 2*(k-1)-mxD)
k -= mxD
var f func(int)
f = func(v int) {
Fprint(out, v+1, " ")
if !onPath[v] {
k--
}
for _, w := range g[v] {
if onPath[w] {
defer f(w)
} else if k > 0 {
f(w)
Fprint(out, v+1, " ")
}
}
}
f(0)
Fprintln(out)
}
}
//func main() { CF1510G(os.Stdin, os.Stdout) }