結果
| 問題 |
No.1418 Sum of Sum of Subtree Size
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2021-06-04 00:36:35 |
| 言語 | Nim (2.2.0) |
| 結果 |
AC
|
| 実行時間 | 186 ms / 2,000 ms |
| コード長 | 3,127 bytes |
| コンパイル時間 | 5,706 ms |
| コンパイル使用メモリ | 87,040 KB |
| 実行使用メモリ | 48,512 KB |
| 最終ジャッジ日時 | 2024-11-17 14:54:29 |
| 合計ジャッジ時間 | 8,840 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 41 |
コンパイルメッセージ
/home/judge/data/code/Main.nim(2, 18) Warning: Use the new 'sugar' module instead; future is deprecated [Deprecated] /home/judge/data/code/Main.nim(1, 8) Warning: imported and not used: 'times' [UnusedImport] /home/judge/data/code/Main.nim(2, 26) Warning: imported and not used: 'strformat' [UnusedImport] /home/judge/data/code/Main.nim(2, 18) Warning: imported and not used: 'future' [UnusedImport] /home/judge/data/code/Main.nim(2, 37) Warning: imported and not used: 'deques' [UnusedImport] /home/judge/data/code/Main.nim(1, 41) Warning: imported and not used: 'algorithm' [UnusedImport] /home/judge/data/code/Main.nim(1, 52) Warning: imported and not used: 'tables' [UnusedImport] /home/judge/data/code/Main.nim(1, 60) Warning: imported and not used: 'sets' [UnusedImport] /home/judge/data/code/Main.nim(1, 66) Warning: imported and not used: 'lists' [UnusedImport] /home/judge/data/code/Main.nim(1, 73) Warning: imported and not used: 'intsets' [UnusedImport] /home/judge/data/code/Main.nim(2, 8) Warning: imported and not used: 'critbits' [UnusedImport]
ソースコード
import times, strutils, sequtils, math, algorithm, tables, sets, lists, intsets
import critbits, future, strformat, deques
template `max=`(x,y) = x = max(x,y)
template `min=`(x,y) = x = min(x,y)
template `mod=`(x,y) = x = x mod y
template scan2 = (scan(), scan())
template scan3 = (scan(), scan())
let read* = iterator: string {.closure.} =
while true: (for s in stdin.readLine.split: yield s)
proc scan(): int = read().parseInt
proc scanf(): float = read().parseFloat
proc toInt(c:char): int =
return int(c) - int('0')
proc solve():int=
var
n = scan()
es = newseqwith(n,newseq[int]())
sumTo = newseq[seq[int]](n)
sizeTo = newseq[seq[int]](n)
cumScoreL = newseq[seq[int]](n)
cumScoreR = newseq[seq[int]](n)
cumSizeL = newseq[seq[int]](n)
cumSizeR = newseq[seq[int]](n)
parIdx = newseqwith(n,0)
for i in 0..<n-1:
var
a = scan()-1
b = scan()-1
es[a].add(b)
es[b].add(a)
var s = -1
# 始点を探す
for i in 0..<n:
if es[i].len==1:
s = i
break
for i in 0..<n:
sumTo[i] = newseqwith(es[i].len,0)
sizeTo[i] = newseqwith(es[i].len,0)
# return
# (部分木のサイズ,部分木のスコア)
proc dfs(par,p:int):(int,int)=
#if es[p].len==1 and es[p][0]==par:return (1,1)
for idx,nxt in es[p]:
if par==nxt:
# 親のインデックスが分かっていると全方位木DPのときに親を除くのが楽
parIdx[p]=idx
continue
(sizeTo[p][idx],sumTo[p][idx]) = dfs(p,nxt)
cumScoreL[p] = newseq[int](es[p].len+1)
cumScoreR[p] = newseq[int](es[p].len+1)
cumSizeL[p] = newseq[int](es[p].len+1)
cumSizeR[p] = newseq[int](es[p].len+1)
for idx in 0..<es[p].len:
cumSizeL[p][idx+1] = cumSizeL[p][idx]+sizeTo[p][idx]
cumScoreL[p][idx+1] = cumScoreL[p][idx]+sumTo[p][idx]
for idx in countdown(es[p].len-1,0):
cumSizeR[p][idx] = cumSizeR[p][idx+1]+sizeTo[p][idx]
cumScoreR[p][idx] = cumScoreR[p][idx+1]+sumTo[p][idx]
return (cumSizeR[p][0]+1,cumScoreR[p][0]+cumSizeR[p][0]+1)
discard dfs(-1,s)
var res = 0
var resNodes = newseqwith(n,0)
proc dpfs(par,p,parScore:int)=
#echo fmt"(par, p, score) = ({par}, {p}, {parScore})"
# 足すもの
# ・親方向の自分を含まない子要素のスコア:全方位木DPの根拠
# ・自分を親とする部分木のサイズ = 常にnでは???
# ・子方向の自分を含まない子要素のスコアの総和
resNodes[p] = parScore+n+cumScoreR[p][0]+n-(cumSizeR[p][0]+1)
res+=parScore+n+cumScoreR[p][0]
res+=n-(cumSizeR[p][0]+1)
#res+=n-cumSizeR[p][0]
for idx,nxt in es[p]:
if par==nxt:continue
dpfs(p,nxt,cumScoreL[p][idx]+cumScoreR[p][idx+1]+parScore+n-(cumSizeR[p][0]+1))
#echo sumTo.join("\n")
#echo ""
#echo sizeTo.join("\n")
#echo ""
#echo cumScoreL.join("\n")
#echo ""
#echo cumScoreR.join("\n")
#echo "cumSizeL:"
#echo cumSizeL.join("\n")
#echo "cumSizeR:"
#echo cumSizeR.join("\n")
dpfs(-1,s,0)
#echo resNodes
return res
echo solve()