結果
問題 | No.952 危険な火薬庫 |
ユーザー | vwxyz |
提出日時 | 2023-01-20 04:28:02 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 1,234 ms / 2,000 ms |
コード長 | 13,477 bytes |
コンパイル時間 | 375 ms |
コンパイル使用メモリ | 82,304 KB |
実行使用メモリ | 151,088 KB |
最終ジャッジ日時 | 2024-06-22 20:58:31 |
合計ジャッジ時間 | 14,126 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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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 | 49 ms
56,320 KB |
testcase_01 | AC | 46 ms
56,448 KB |
testcase_02 | AC | 47 ms
56,320 KB |
testcase_03 | AC | 927 ms
126,084 KB |
testcase_04 | AC | 911 ms
124,800 KB |
testcase_05 | AC | 755 ms
115,672 KB |
testcase_06 | AC | 1,110 ms
135,508 KB |
testcase_07 | AC | 436 ms
96,972 KB |
testcase_08 | AC | 1,175 ms
143,588 KB |
testcase_09 | AC | 1,234 ms
144,424 KB |
testcase_10 | AC | 598 ms
104,384 KB |
testcase_11 | AC | 49 ms
57,024 KB |
testcase_12 | AC | 598 ms
105,596 KB |
testcase_13 | AC | 640 ms
107,288 KB |
testcase_14 | AC | 247 ms
84,032 KB |
testcase_15 | AC | 828 ms
120,892 KB |
testcase_16 | AC | 285 ms
86,284 KB |
testcase_17 | AC | 228 ms
83,840 KB |
testcase_18 | AC | 347 ms
89,868 KB |
testcase_19 | AC | 98 ms
76,928 KB |
testcase_20 | AC | 110 ms
77,056 KB |
testcase_21 | AC | 592 ms
102,952 KB |
testcase_22 | AC | 229 ms
82,772 KB |
testcase_23 | AC | 106 ms
77,056 KB |
testcase_24 | AC | 151 ms
79,360 KB |
testcase_25 | AC | 1,166 ms
151,088 KB |
ソースコード
import sys readline=sys.stdin.readline from collections import deque class AVL_Node_dict: """ノード Attributes: key (any): ノードのキー。比較可能なものであれば良い。(1, 4)などタプルも可。 val (any): ノードの値。 left (Node): 左の子ノード。 right (Node): 右の子ノード。 bias (int): 平衡度。(左部分木の高さ)-(右部分木の高さ)。 size (int): 自分を根とする部分木の大きさ """ def __init__(self,parent,key,value): self.parent=parent self.key=key self.value=value self.left=None self.right=None self.bias=0 self.size=1 class AVLTree_dict: def __init__(self): self.root=None def Rotate_Left(self,node): node_right=node.right node_right.size=node.size node.size-=1 if node_right.right!=None: node.size-=node_right.right.size if node_right.bias==-1: node_right.bias=0 node.bias=0 else: #assert node_right.bias==0 node_right.bias=1 node.bias=-1 node.right=node_right.left node_right.left=node return node_right def Rotate_Right(self,node): node_left=node.left node_left.size=node.size node.size-=1 if node_left.left!=None: node.size-=node_left.left.size if node_left.bias==1: node_left.bias=0 node.bias=0 else: #assert node_left.bias==0 node_left.bias=-1 node.bias=1 node.left=node_left.right node_left.right=node return node_left def Rotate_Left_Right(self,node): node_left=node.left node_left_right=node_left.right #assert node.bias==2 #assert node_left.bias==-1 #assert node_left_right.bias in (-1,0,1) node_left_right.size=node.size node.size-=node_left.size if node_left_right.right!=None: node.size+=node_left_right.right.size node_left.size-=1 if node_left_right.right!=None: node_left.size-=node_left_right.right.size node_left.right=node_left_right.left node_left_right.left=node_left node.left=node_left_right.right node_left_right.right=node self.Update_Bias_Double(node_left_right) return node_left_right def Rotate_Right_Left(self,node): node_right=node.right node_right_left=node_right.left #assert node.bias==-2 #assert node_right.bias==1 #assert node_right_left.bias in (-1,0,1) node_right_left.size=node.size node.size-=node_right.size if node_right_left.left!=None: node.size+=node_right_left.left.size node_right.size-=1 if node_right_left.left!=None: node_right.size-=node_right_left.left.size node_right.left=node_right_left.right node_right_left.right=node_right node.right=node_right_left.left node_right_left.left=node self.Update_Bias_Double(node_right_left) return node_right_left def Update_Bias_Double(self,node): #assert node.right.bias*node.left.bias==-2 #assert node.right.bias>0 if node.bias==1: node.right.bias=-1 node.left.bias=0 elif node.bias==-1: node.right.bias=0 node.left.bias=1 else: node.right.bias=0 node.left.bias=0 node.bias=0 def __getitem__(self,key): v=self.root while v!=None: if key<v.key: v=v.left elif v.key<key: v=v.right else: return v.value return None def __setitem__(self,key,value): if self.root==None: self.root=AVL_Node_dict(None,key,value) return v=self.root stack=[] while v!=None: if key<v.key: stack.append((v,1)) v=v.left elif v.key<key: stack.append((v,-1)) v=v.right elif v.key==key: v.value=value return p,direction=stack[-1] if direction==1: p.left=AVL_Node_dict(p,key,value) else: p.right=AVL_Node_dict(p,key,value) while stack: v,direction=stack.pop() v.bias+=direction v.size+=1 vv=None if v.bias==2: if v.left.bias==-1: vv=self.Rotate_Left_Right(v) else: vv=self.Rotate_Right(v) #assert vv!=None break if v.bias==-2: if v.right.bias==1: vv=self.Rotate_Right_Left(v) else: vv=self.Rotate_Left(v) #assert vv!=None break if v.bias==0: break if vv!=None: if len(stack)==0: self.root=vv return p,direction=stack.pop() p.size+=1 if direction==1: p.left=vv else: p.right=vv while stack: p,direction=stack.pop() p.size+=1 def __delitem__(self,key): v=self.root stack=[] while v!=None: if key<v.key: stack.append((v,1)) v=v.left elif v.key<key: stack.append((v,-1)) v=v.right else: break else: return False if v.left!=None: stack.append((v,1)) lmax=v.left while lmax.right!=None: stack.append((lmax,-1)) lmax=lmax.right v.key=lmax.key v.value=lmax.value v=lmax c=v.right if v.left==None else v.left if stack: p,direction=stack[-1] if direction==1: p.left=c else: p.right=c else: self.root=c return True while stack: pp=None p,direction=stack.pop() p.bias-=direction p.size-=1 if p.bias==2: if p.left.bias==-1: pp=self.Rotate_Left_Right(p) else: pp=self.Rotate_Right(p) elif p.bias==-2: if p.right.bias==1: pp=self.Rotate_Right_Left(p) else: pp=self.Rotate_Left(p) elif p.bias!=0: break if pp!=None: if len(stack)==0: self.root=pp return True p,direction=stack[-1] if direction==1: p.left=pp else: p.right=pp if pp.bias!=0: break while stack: p,direction=stack.pop() p.size-=1 return True def __contain__(self,key): v=self.root while v!=None: if key<v.key: v=v.left elif v.key<key: v=v.right else: return True return False def Bisect_Right(self,key): retu=None v=self.root while v!=None: if v.key>key: if retu==None or retu[0]>v.key: retu=(v.key,v.value) v=v.left else: v=v.right return retu def Bisect_Left(self,key): retu=None v=self.root while v!=None: if v.key<key: if retu==None or retu[0]<v.key: retu=(v.key,v.value) v=v.right else: v=v.left return retu def Find_Kth_Element(self,K): v=self.root s=0 while v!=None: t=s+v.left.size if v.left!=None else s if t==K: return v.key,v.value elif t<K: s=t+1 v=v.right else: v=v.left return None def keys(self): stack=[(self.root,True)] while stack: node,subtree=stack.pop() if subtree: if node.right!=None: stack.append((node.right,True)) stack.append((node,False)) if node.left!=None: stack.append((node.left,True)) else: yield node.key def values(self): stack=[(self.root,True)] while stack: node,subtree=stack.pop() if subtree: if node.right!=None: stack.append((node.right,True)) stack.append((node,False)) if node.left!=None: stack.append((node.left,True)) else: yield node.value def items(self): stack=[(self.root,True)] while stack: node,subtree=stack.pop() if subtree: if node.right!=None: stack.append((node.right,True)) stack.append((node,False)) if node.left!=None: stack.append((node.left,True)) else: yield (node.key,node.value) def __bool__(self): return self.root!=None def __len__(self): return 0 if self.root==None else self.root.size def __iter__(self): return iter(self.keys()) def __str__(self): if self.root==None: retu="{}" else: retu="{"+", ".join(f"{r}: {m}" for r,m in self.items())+"}" return retu class Convex_Hull_Trick: def __init__(self): self.lines=AVLTree_dict() def is_removed(self,line0,line1,line2): if line0==None: return False if line2==None: return False a0,b0=line0 a1,b1=line1 a2,b2=line2 return (a1-a0)*(b2-b1)<=(b1-b0)*(a2-a1) def add_line(self,a,b): bb=self.lines[a] if bb!=None and bb<=b: return line0=self.lines.Bisect_Left(a) line1=(a,b) line2=self.lines.Bisect_Right(a) if self.is_removed(line0,line1,line2): return self.lines[a]=b line2=(a,b) line1=self.lines.Bisect_Left(line2[0]) line0=None if line1==None else self.lines.Bisect_Left(line1[0]) while self.is_removed(line0,line1,line2): del self.lines[line1[0]] line1=line0 line0=None if line1==None else self.lines.Bisect_Left(line1[0]) line0=(a,b) line1=self.lines.Bisect_Right(line0[0]) line2=None if line1==None else self.lines.Bisect_Right(line1[0]) while self.is_removed(line0,line1,line2): del self.lines[line1[0]] line1=line2 line2=None if line1==None else self.lines.Bisect_Right(line1[0]) def __call__(self,x): size=len(self.lines) if not size: return None ok,ng=-1,size-1 while ng-ok>1: mid=(ok+ng)//2 a0,b0=self.lines.Find_Kth_Element(mid) a1,b1=self.lines.Find_Kth_Element(mid+1) if a0*x+b0>a1*x+b1: ok=mid else: ng=mid a,b=self.lines.Find_Kth_Element(ok+1) return a*x+b def __getitem__(self,a): return self.lines[a] def __setitem__(self,a,b): self.add_line(a,b) class Convex_Hull_Trick_deque: """ f_i = a_ix + b_i とする。f_i の追加および、min_i f(x) の取得ができるデータ構造。 ただし、傾き a_i は降順に追加されなければならない。 また、クエリ x も昇順に実行されなければならない。 """ def __init__(self): self.lines=deque() def add_line(self,a,b): lines=self.lines while len(lines) >= 2: a1,b1=lines[-2] a2,b2=lines[-1] if (a2-a1)*(b-b2)<(b2-b1)*(a-a2): break lines.pop() lines.append((a, b)) def __call__(self, x): lines=self.lines a,b=lines[0] y=a*x+b while len(lines) >= 2: a2, b2 = lines[1] y2 = a2 * x + b2 if y < y2: break y = y2 lines.popleft() return y N=int(readline())+1 A=[0]+list(map(int,readline().split()))+[1<<30] for n in range(1,N+1): A[n]+=A[n-1] inf=1<<60 dp=[[inf]*(N+1) for k in range(N+1)] dp[0][0]=0 for d in range(1,N+1): CHT=Convex_Hull_Trick_deque() CHT.add_line(0,dp[d-1][0]) for n in range(d,N+1): k=n-d dp[n][k]=dp[n-1][k] dp[n][k]=min(dp[n][k],CHT(A[n-1])+A[n-1]**2) CHT.add_line(-2*A[n-1],A[n-1]**2+dp[n-1][k]) #for l in range(d-1,n-1): #dp[n][k]=min(dp[n][k],dp[l][l+1-d]+A[l]**2-2*A[l]*A[n-1]+A[n-1]**2) for k in range(1,N): ans=dp[N][k] print(ans)