結果

問題 No.1095 Smallest Kadomatsu Subsequence
ユーザー aru aru
提出日時 2020-09-21 15:22:34
言語 Go
(1.23.4)
結果
AC  
実行時間 609 ms / 2,000 ms
コード長 4,833 bytes
コンパイル時間 13,382 ms
コンパイル使用メモリ 237,820 KB
実行使用メモリ 22,628 KB
最終ジャッジ日時 2024-06-24 11:33:56
合計ジャッジ時間 17,256 ms
ジャッジサーバーID
(参考情報)
judge3 / judge1
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 30
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

package main
import (
"bufio"
"fmt"
"math"
"os"
"sort"
"strconv"
"strings"
)
func out(x ...interface{}) {
fmt.Println(x...)
}
var sc = bufio.NewScanner(os.Stdin)
func getInt() int {
sc.Scan()
i, e := strconv.Atoi(sc.Text())
if e != nil {
panic(e)
}
return i
}
func getInts(N int) []int {
ret := make([]int, N)
for i := 0; i < N; i++ {
ret[i] = getInt()
}
return ret
}
func getString() string {
sc.Scan()
return sc.Text()
}
// min, max, asub, abs
func max(a, b int) int {
if a > b {
return a
}
return b
}
func min(a, b int) int {
if a < b {
return a
}
return b
}
func asub(a, b int) int {
if a > b {
return a - b
}
return b - a
}
func abs(a int) int {
if a >= 0 {
return a
}
return -a
}
func lowerBound(a []int, x int) int {
idx := sort.Search(len(a), func(i int) bool {
return a[i] >= x
})
return idx
}
func upperBound(a []int, x int) int {
idx := sort.Search(len(a), func(i int) bool {
return a[i] > x
})
return idx
}
//
var (
y uint = 88172645463325252
)
const inf = math.MaxInt64
func xorshift() uint {
y ^= y << 7
y ^= y >> 9
return y
}
type treapNode struct {
value int
priority uint
count int
left *treapNode
right *treapNode
}
func newTreapNode(v int) *treapNode {
return &treapNode{v, xorshift(), 1, nil, nil}
}
func treapRotateRight(n *treapNode) *treapNode {
l := n.left
n.left = l.right
l.right = n
return l
}
func treapRotateLeft(n *treapNode) *treapNode {
r := n.right
n.right = r.left
r.left = n
return r
}
func treapInsert(n *treapNode, v int) *treapNode {
if n == nil {
return newTreapNode(v)
}
if n.value == v {
n.count++
return n
}
if n.value > v {
n.left = treapInsert(n.left, v)
if n.priority > n.left.priority {
n = treapRotateRight(n)
}
} else {
n.right = treapInsert(n.right, v)
if n.priority > n.right.priority {
n = treapRotateLeft(n)
}
}
return n
}
func treapDelete(n *treapNode, v int) *treapNode {
if n == nil {
panic("node is not found!")
}
if n.value > v {
n.left = treapDelete(n.left, v)
return n
}
if n.value < v {
n.right = treapDelete(n.right, v)
return n
}
// n.value == v
if n.count > 1 {
n.count--
return n
}
if n.left == nil && n.right == nil {
return nil
}
if n.left == nil {
n = treapRotateLeft(n)
} else if n.right == nil {
n = treapRotateRight(n)
} else {
// n.left != nil && n.right != nil
if n.left.priority < n.right.priority {
n = treapRotateRight(n)
} else {
n = treapRotateLeft(n)
}
}
return treapDelete(n, v)
}
func treapCount(n *treapNode) int {
if n == nil {
return 0
}
return n.count + treapCount(n.left) + treapCount(n.right)
}
func treapString(n *treapNode) string {
if n == nil {
return ""
}
result := make([]string, 0)
if n.left != nil {
result = append(result, treapString(n.left))
}
result = append(result, fmt.Sprintf("%d:%d", n.value, n.count))
if n.right != nil {
result = append(result, treapString(n.right))
}
return strings.Join(result, " ")
}
func treapMin(n *treapNode) int {
if n.left != nil {
return treapMin(n.left)
}
return n.value
}
func treapLEMax(n *treapNode, v int) int {
ret := -inf
t := n
for t != nil {
if t.value <= v {
ret = max(ret, t.value)
}
if t.value > v {
t = t.left
} else {
t = t.right
}
}
return ret
}
func treapGEMin(n *treapNode, v int) int {
ret := inf
t := n
for t != nil {
if t.value >= v {
ret = min(ret, t.value)
}
if t.value < v {
t = t.right
} else {
t = t.left
}
}
return ret
}
func treapMax(n *treapNode) int {
if n.right != nil {
return treapMax(n.right)
}
return n.value
}
type treap struct {
root *treapNode
size int
}
func (t *treap) Insert(v int) {
t.root = treapInsert(t.root, v)
t.size++
}
func (t *treap) Delete(v int) {
t.root = treapDelete(t.root, v)
t.size--
}
func (t *treap) String() string {
return treapString(t.root)
}
func (t *treap) Count() int {
return t.size
}
func (t *treap) Min() int {
return treapMin(t.root)
}
func (t *treap) LEMax(v int) int {
return treapLEMax(t.root, v)
}
func (t *treap) Max() int {
return treapMax(t.root)
}
func (t *treap) GEMin(v int) int {
return treapGEMin(t.root, v)
}
func main() {
sc.Split(bufio.ScanWords)
sc.Buffer([]byte{}, 1000000)
N := getInt()
A := getInts(N)
lt := &treap{}
rt := &treap{}
lt.Insert(A[0])
for i := 2; i < N; i++ {
rt.Insert(A[i])
}
result := inf
for i := 1; i < N-1; i++ {
a := lt.Min()
b := rt.Min()
if a < A[i] && b < A[i] {
result = min(result, a+b+A[i])
}
c := lt.GEMin(A[i])
d := rt.GEMin(A[i])
if c != inf && d != inf && c > A[i] && d > A[i] {
result = min(result, c+d+A[i])
}
lt.Insert(A[i])
rt.Delete(A[i+1])
}
if result == inf {
out(-1)
return
}
out(result)
}
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