結果

問題 No.1095 Smallest Kadomatsu Subsequence
ユーザー c-yanc-yan
提出日時 2020-06-26 22:01:28
言語 Go
(1.22.1)
結果
AC  
実行時間 615 ms / 2,000 ms
コード長 4,697 bytes
コンパイル時間 10,656 ms
コンパイル使用メモリ 209,428 KB
実行使用メモリ 23,036 KB
最終ジャッジ日時 2023-09-18 04:37:03
合計ジャッジ時間 16,763 ms
ジャッジサーバーID
（参考情報） 		judge15 / judge13
このコードへのチャレンジ（β）

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
4,376 KB
testcase_01 AC 1 ms
4,376 KB
testcase_02 AC 1 ms
4,376 KB
testcase_03 AC 1 ms
4,376 KB
testcase_04 AC 2 ms
4,376 KB
testcase_05 AC 2 ms
4,376 KB
testcase_06 AC 1 ms
4,380 KB
testcase_07 AC 1 ms
4,380 KB
testcase_08 AC 1 ms
4,380 KB
testcase_09 AC 1 ms
4,380 KB
testcase_10 AC 1 ms
4,376 KB
testcase_11 AC 1 ms
4,380 KB
testcase_12 AC 1 ms
4,380 KB
testcase_13 AC 13 ms
5,504 KB
testcase_14 AC 14 ms
5,500 KB
testcase_15 AC 13 ms
5,500 KB
testcase_16 AC 13 ms
5,504 KB
testcase_17 AC 13 ms
5,500 KB
testcase_18 AC 13 ms
5,500 KB
testcase_19 AC 13 ms
5,500 KB
testcase_20 AC 13 ms
5,504 KB
testcase_21 AC 13 ms
5,504 KB
testcase_22 AC 14 ms
5,504 KB
testcase_23 AC 606 ms
20,924 KB
testcase_24 AC 604 ms
20,932 KB
testcase_25 AC 593 ms
20,932 KB
testcase_26 AC 609 ms
20,936 KB
testcase_27 AC 615 ms
20,932 KB
testcase_28 AC 171 ms
23,028 KB
testcase_29 AC 173 ms
23,036 KB
testcase_30 AC 343 ms
22,992 KB
testcase_31 AC 329 ms
20,932 KB
testcase_32 AC 329 ms
20,928 KB
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 # 

package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
	"strings"
)

var (
	y uint = 88172645463325252
)

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 treapGEMin(n *treapNode, v int) int {
	if n.value == v {
		return v
	}
	if n.value > v {
		if n.left != nil {
			return treapGEMin(n.left, v)
		}
		return n.value
	}
	// n.value < v
	if n.right != nil {
		return treapGEMin(n.right, v)
	}
	return math.MaxInt64
}

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) Max() int {
	return treapMax(t.root)
}

func (t *treap) GEMin(v int) int {
	return treapGEMin(t.root, v)
}

func min(x, y int) int {
	if x < y {
		return x
	}
	return y
}

func main() {
	defer flush()

	N := readInt()
	A := make([]int, N)
	for i := 0; i < N; i++ {
		A[i] = readInt()
	}

	lt := &treap{}
	rt := &treap{}
	lt.Insert(A[0])
	for i := 2; i < N; i++ {
		rt.Insert(A[i])
	}

	result := math.MaxInt64
	for i := 1; i < N-1; i++ {
		a := lt.Min()
		b := rt.Min()
		if a <= A[i] && b <= A[i] {
			//printf("凸 %d %d %d\n", a, A[i], b)
			result = min(result, a+A[i]+b)
		}

		c := lt.GEMin(A[i])
		d := rt.GEMin(A[i])
		if c != math.MaxInt64 && d != math.MaxInt64 && c >= A[i] && d >= A[i] {
			//printf("凹 %d %d %d\n", c, A[i], d)
			result = min(result, c+A[i]+d)
		}

		lt.Insert(A[i])
		rt.Delete(A[i+1])
	}
	if result == math.MaxInt64 {
		println(-1)
	} else {
		println(result)
	}
}

const (
	ioBufferSize = 1 * 1024 * 1024 // 1 MB
)

var stdinScanner = func() *bufio.Scanner {
	result := bufio.NewScanner(os.Stdin)
	result.Buffer(make([]byte, ioBufferSize), ioBufferSize)
	result.Split(bufio.ScanWords)
	return result
}()

func readString() string {
	stdinScanner.Scan()
	return stdinScanner.Text()
}

func readInt() int {
	result, err := strconv.Atoi(readString())
	if err != nil {
		panic(err)
	}
	return result
}

func readInts(n int) []int {
	result := make([]int, n)
	for i := 0; i < n; i++ {
		result[i] = readInt()
	}
	return result
}

var stdoutWriter = bufio.NewWriter(os.Stdout)

func flush() {
	stdoutWriter.Flush()
}

func printf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(stdoutWriter, f, args...)
}

func println(args ...interface{}) (int, error) {
	return fmt.Fprintln(stdoutWriter, args...)
}
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