use ellipsis in query

Author: EndlessCheng

copypasta/template/interactive_problem/main.go

@@ -9,7 +9,7 @@ import (
 // github.com/EndlessCheng/codeforces-go
 type (
 	initData struct{ n int }
-	request  struct{ i int }
+	request  struct{ q []int }
 	response struct{ v int }
 	answer   struct{ ans []int }
 )
@@ -31,8 +31,13 @@ func (io io) readInitData() (d initData) {
 }
 
 func (io io) query(q request) (resp response) {
-	Fprintln(io.out, "?", q.i)
+	Fprint(io.out, "?")
+	for _, v := range q.q {
+		Fprint(io.out, " ", v)
+	}
+	Fprintln(io.out)
 	io.out.Flush()
+
 	Fscan(io.in, &resp.v)
 	if resp.v < 0 {
 		panic(-1)
@@ -57,7 +62,7 @@ func (io io) printAnswer(a answer) {
 }
 
 func doInteraction(it interaction) {
-	q := func(i int) int { return it.query(request{i}).v }
+	q := func(q ...int) int { return it.query(request{q}).v }
 	dt := it.readInitData()
 	n := dt.n
 	ans := make([]int, n) //