結果

問題 No.742 にゃんにゃんにゃん 猫の挨拶
ユーザー ccppjsrbccppjsrb
提出日時 2020-08-22 09:58:03
言語 Go
(1.23.4)
結果
AC  
実行時間 44 ms / 2,500 ms
コード長 2,368 bytes
コンパイル時間 14,568 ms
コンパイル使用メモリ 237,680 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-10-15 06:49:50
合計ジャッジ時間 14,897 ms
ジャッジサーバーID
(参考情報)
judge5 / judge4
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
other AC * 16
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"
"os"
"sort"
"strconv"
)
func configure(scanner *bufio.Scanner) {
scanner.Split(bufio.ScanWords)
scanner.Buffer(make([]byte, 1000005), 1000005)
}
func getNextString(scanner *bufio.Scanner) string {
scanned := scanner.Scan()
if !scanned {
panic("scan failed")
}
return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
i, _ := strconv.Atoi(getNextString(scanner))
return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
i, _ := strconv.ParseFloat(getNextString(scanner), 64)
return i
}
func main() {
fp := os.Stdin
wfp := os.Stdout
extra := 0
if os.Getenv("I") == "IronMan" {
fp, _ = os.Open(os.Getenv("END_GAME"))
extra = 100
}
scanner := bufio.NewScanner(fp)
configure(scanner)
writer := bufio.NewWriter(wfp)
defer func() {
r := recover()
if r != nil {
fmt.Fprintln(writer, r)
}
writer.Flush()
}()
solve(scanner, writer)
for i := 0; i < extra; i++ {
fmt.Fprintln(writer, "-----------------------------------")
solve(scanner, writer)
}
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
n := getNextInt(scanner)
mm := make([][2]int, n)
for i := 0; i < n; i++ {
mm[i][0] = i
mm[i][1] = getNextInt(scanner) - 1
}
sort.SliceStable(mm, func(i, j int) bool {
return mm[i][1] < mm[j][1]
})
seg := newSegment(n)
var ans int
for i := 0; i < n; i++ {
ans += mm[i][0] - seg.query(0, mm[i][0], 0, seg.add)
seg.update(mm[i][0], 1, seg.add)
}
fmt.Fprintln(writer, ans)
}
type segment [][]int
func newSegment(n int) segment {
seg := make(segment, 0)
for n > 1 {
seg = append(seg, make([]int, n))
n = (n + 1) >> 1
}
seg = append(seg, make([]int, 1))
return seg
}
func (seg segment) update(i int, v int, f func(int, int) int) {
seg[0][i] = v
for h := 1; h < len(seg); h++ {
i >>= 1
if i<<1+1 < len(seg[h-1]) {
seg[h][i] = f(seg[h-1][i<<1], seg[h-1][i<<1+1])
} else {
seg[h][i] = seg[h-1][i<<1]
}
}
}
func (seg segment) query(l, r int, s int, f func(int, int) int) int {
for h := 0; h < len(seg) && l < r; h++ {
if l&1 == 1 {
s = f(s, seg[h][l])
l++
}
l >>= 1
if r&1 == 1 {
s = f(s, seg[h][r-1])
}
r >>= 1
}
return s
}
func (seg segment) add(x, y int) int {
return x + y
}
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