結果
問題 | No.778 クリスマスツリー |
ユーザー | ccppjsrb |
提出日時 | 2020-08-27 19:55:49 |
言語 | Go (1.22.1) |
結果 |
AC
|
実行時間 | 176 ms / 2,000 ms |
コード長 | 2,840 bytes |
コンパイル時間 | 14,131 ms |
コンパイル使用メモリ | 222,276 KB |
実行使用メモリ | 46,080 KB |
最終ジャッジ日時 | 2024-11-08 02:01:44 |
合計ジャッジ時間 | 16,651 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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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
5,248 KB |
testcase_01 | AC | 1 ms
5,248 KB |
testcase_02 | AC | 1 ms
5,248 KB |
testcase_03 | AC | 2 ms
5,248 KB |
testcase_04 | AC | 1 ms
5,248 KB |
testcase_05 | AC | 1 ms
5,248 KB |
testcase_06 | AC | 112 ms
46,080 KB |
testcase_07 | AC | 46 ms
24,192 KB |
testcase_08 | AC | 176 ms
32,384 KB |
testcase_09 | AC | 144 ms
24,064 KB |
testcase_10 | AC | 141 ms
24,064 KB |
testcase_11 | AC | 143 ms
24,064 KB |
testcase_12 | AC | 133 ms
23,936 KB |
testcase_13 | AC | 62 ms
20,608 KB |
testcase_14 | AC | 117 ms
46,080 KB |
ソースコード
package main import ( "bufio" "fmt" "os" "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) g := newGraph(n) for i := 1; i < n; i++ { a := getNextInt(scanner) g.appendEdge(a, i, i-1) } var c int c = -1 g.dfs(0, -1, func() int { c++; return c }) seg := newSegment(n << 1) var ans int for i := n - 1; i >= 0; i-- { ans += seg.query(g.v[i].l, g.v[i].r+1, 0, seg.add) seg.update(g.v[i].l, 1, seg.add) } fmt.Fprintln(writer, ans) } type vertex struct { l, r, c int } type edge struct { to, id int } type graph struct { v []vertex e [][]edge } func newGraph(n int) graph { return graph{ v: make([]vertex, n), e: make([][]edge, n), } } func (g *graph) appendEdge(from, to, id int) { g.e[from] = append(g.e[from], edge{ to: to, id: id, }) } func (g *graph) dfs(i, p int, fn func() int) { g.v[i].l = fn() for _, e := range g.e[i] { if e.to == p { continue } g.dfs(e.to, i, fn) } g.v[i].r = fn() } 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 }